wheel alignment CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
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Page 161 of 659
SECTION 2
FRAME
INDEX
Page
General Description 2-1
Chevrolet 2-1
Cheveile '. 2-1
Repair Procedures 2-1
Page
Checking Frame Alignment 2-1
Car Preparation 2-1
Tramming Sequence 2-1
Reference Point Dimensions 2-1
GENERAL DESCRIPTION
CHEVROLET AND CHEVELLE
Frames used on Chevrolet and Cheveile lines are basi-
cally the same, consisting of full length right and left
side members joined laterally by crossmembers. Sev-
eral different frames are used in each line to meet the
various vehicle size and function requirements but the
basic shape for each line remains the same. Differences
between frames in a given line exist only in metal gauge,
part size and numbers of parts necessary to meet the
particular structural requirements of the models
involved.
CORVETTE
The Corvette frame is a rigid perimeter unit, with five
crossmembers. From the rear kick-up forward, trap-
azoidal shaped, closed side members outline and protect
the passenger compartment. At the cowl area, the side
members curve inward in a sweeping "S" shape, to pro-
vide a sturdy foundation for the engine mounts and clear-
ance for front wheel movement. From the kick-up
rearward, box-sectioned side rails provide fore and aft
support for the rear axle and suspension. Lateral sup-
port is provided by five variously shaped welded-in
crossmembers, including the front unit, which formerly
was bolted-in.
CHEVY II AND CAMARO
Underbody alignment checking procedures will be found
in the Body Service Manual.
REPAIR PROCEDURES
CHECKING FRAME ALIGNMENT
Vehicles involved in an accident of any nature which
might result in a "swayed" or "sprung" frame should
always be checked for proper frame alingment in addi-
tion to steering geometry and wheel alignment.
CAR PREPARATION
Preparing the car for the frame alignment check in-
volves the following:
1.
Place the car on level surface.
2.
The weight of the car should be supported at the
wheel locations.
3.
A visual damage inspection should be made to elim-
inate needless measuring. Obviously damaged or
misaligned areas can often be located by sight.
TRAMMING SEQUENCE
When checking a frame for alignment in case of dam-
age,
the first step is horizontal "X" checking with a
tram from similar given points on opposite side of the
frame.
Frame alignment checks on all models should be made
with the tram points set at the center of each locating
point indicated and the cross bar level to insure
accuracy.
When "X" checking any section of the frame, the
measurements should agree within 3/16". If they do not,
it means that corrections will have to be made.
If a tram gauge is not available, the "plumb bob"
method of checking may be used. To assure any degree
of accuracy when using this method, the vehicle should
be on a level floor.
By using this method, it is only necessary to have a
#
piece of cord attached to an ordinary surveyor's plumb
bob.
When measuring the distance between two points,
the free end of the cord should be placed on the reference
point allowing the plumb bob to hang on the floor. A check
mark should be made on the floor just under the tip of
the plumb bob. This operation should be repeated at all
reference points. With these points located on the floor,
they may easily be measured with a rule.
The second step is checking the vertical dimensions
from the datum plane to the points to be trammed. With
the proper settings the tram bar will be on a plane
parallel to that of the frame. The exception to this would '
be when one of the reference locations is included in the
misaligned area; then the parallel plane between the
frame and the tram bar may not prevail. After com-
pletion of the repairs, the tram gauge should be set at
the specified dimension to check the accuracy of the re-
pair operation.
ALIGNMENT REFERENCE POINT DIMENSIONS
Dimensions to holes are measured to dead center of
the holes and flush to the adjacent surface metal.
CHEVROLET CHASSIS SERVICE MANUAL
Page 165 of 659
SECTION
3
FRONT SUSPENSION
INDEX
Page
General Description
. . . . 3-1
Maintenance and Adjustments
3-3
Front Wheel Bearing Adjustment
3-3
Front End Alignment
3-5 .
Alignment Preliminary Steps ............
3-5
Caster
and
Camber Adjustments
. . 3-5
Chevelle, Caxnaro
and
Corvette
3-5
Chevrolet and Chevy
II 3-6
Steering Axis Inclination
3-6
Toe-in Adjustment
3-6
Cornering Wheel Relationship
3-6
Riding Heigit
and
Coil Spring Sag
3-7
Repair Procedures
3-8
Front Brake Drum (Chevrolet, Camaro, Chevelle,
Chevy E)
. . 3-8
Removal
3-8
Installation
3-8
Front Wheel Hub
3-8
Replacement
. . . . . 3-8
Replacement
of
Hub Wheel Bolts
3-8
Front Wheel Bearings
. . 3-8
Removal
3-8
Inspection
3-9
Repairs
. . 3-9
Replacement
of
Bearing Cups
3-9
Installation
3-9
Steering Knuckle
. . . 3-9
Removal
3-9
Installation
3-9
Shock Absorber
3-10
Chevrolet, Chevelle, Camaro
and
Corvette
3-10
Removal
, . 3-10
Installation
3-10
Chevy
It 3-11
Removal
3-11
Installation
3-11
Stabilizer
Bar 3-11
Removal
3-11
Installation
3-11
Strut Rod
3-11
Chevrolet and Chevy
II 3-11
Removal
3-11
Installation
3-12
Front Coil Springs
3-12
Chevrolet
3-12
Removal
3-12
Installation
3-13
Chevelle
and
Camaro
3-13
Removal
3-13
Installation
3-14
Chevy H
3-14
Removal
3-14
Spring Seat Disassembly and Assembly
3-15
Installation
3-15
Corvette
3-15
Lower Control Arm Spherical Joint
.' 3-16
Chevrolet, Chevelle, Camaro and
Corvette
3-16
Inspection
. 3-16
Chevrolet and Corvette
3-16
Removal
3-16
Installation
3-16
Page
Chevelle
and
Camaro
3-17
Removal
3-17
Installation
. . . . 3-17
Chevy
II 3-17
Inspection
. 3-17
Removal
3-17
Installation
3-17
Lube Fittings
3-18
Lower Control Arm
. . . . 3-18
Chevrolet
. 3-18
Removal
3-18
Installation
3-18
Chevelle and Camaro
3-18
Removal
3-18
Installation
3-18
Chevy H
3-18
Removal
3-18
Installation
3-19
Corvette
3-19
Removal
3-19
mstallation
3-19
Lower Control Arm Bushings
3-20
Chevrolet
3-20
Removal
3-20
Installation
3-20
Chevelle and Camaro
. 3-20
Removal
3-20
Installation
3-20
Chevy H
3-21
Removal
* 3-21
InstaEation
3-21
Cross Shaft and/or Bushings
. 3-21
Corvette
3-21
Removal
3-21
Installation
3-21
Upper Control Arm Spherical Joint
3-21
Chevrolet, Chevelle, Camaro and Corvette
..... 3-21
Inspection.
3-21
Replacement
3-21
Chevy
II 3-21
Inspection
3-21
Replacement
3-21
Lube Fittings
3-22
Upper Control Arm
3-22
Chevrolet, Chevelle, Camaro
and
Corvette
3-22
Removal
3-22
Installation
3-22
Chevy H
3-22
Removal
3-22
Installation
3-23
Upper Control Arm Cross Shaft
and/or Bushings
3-23
Chevrolet, Camaro and Chevelle
3-23
Removal
. 3-23
Installation
3-23
Chevy H
3-24
Removal
3-24
Installation
. . . 3-25
Corvette
3-25
Removal
3-25
Installation
3-25
Special Tools
3-26
Specifications
...'..'
At rear of Book
GENERAL DESCRIPTION
The 1967 Chevrolet, Chevelle, Camaro, Chevy n and
Corvette front suspension systems are basically similar,
being of the
S.L.A.
(short-long arm) type with independent
coil springs. In the Chevrolet, Chevelle, Camaro and
Corvette the springs ride on the lower control arms; in
the Chevy II the springs ride on the upper control arms.
Spherical joints connect the upper and lower arms to the
steering knuckle. Tapered roller wheel bearings are
used.
Camber angle is adjusted, on the Chevrolet and Chevy n
CHEVROLET CHASSIS SERVICE MANIM
Page 169 of 659
FRONT SUSPENSION 3-5
FRONT END ALIGNMENT
Front end alignment, that is alignment of the inter-
related steering components of the front suspension sys-
tem, must be correctly maintained to assure ease and
stability of steering and satisfactory tire life.
Alignment Preliminary Steps
Several different types of machines are available for
checking all the factors of front end alignment. The in-
structions furnished with each particular machine should
be followed. In all cases, however, checks should be
made with the vehicle level and at curb weight.
Since steering complaints are not always the result of
improper alignment a check should be made to see if any
of the following conditions exist. Any such conditions
should be corrected before proceeding further.
1.
Steering gear loose or improperly adjusted.
2.
Steering gear housing loose at frame.
3.
Excessive wear or play in spherical joints or steer-
ing shaft coupling.
4.
Tie rod or steering connections loose.
5.
Improper front spring heights.
6. Unbalanced or underinflated tires.
7.
Improperly adjusted wheel bearings.
8. Shock absorbers not operating properly.
Wheel alignment should always be made with the vehi-
cle rolled forward taking out any slack in the same man-
ner as when the vehicle is traveling forward.
Caster and Camber Adjustment
NOTE: Before adjusting caster and camber
angles, the front bumper should be raised and
quickly released to allow car to return to its
normal height.
Chevelle, Camaro and Corvette
Caster and camber adjustments are made by means of
shims inserted between the upper control arm inner sup-
port shaft and the support bracket attached to the frame
(fig. 6). Shims may be added, subtracted or transferred
to change the readings as follows:
Fig.
6 - Caster and Camber Adjustment - Chevelle
Typical of Corvette and Camaro
Caster - change shims at either the front or rear of
the shaft.
The addition of shims at the front bolt or removal
of shims at the rear bolt will decrease positive
caster. One shim (1/3 2") will change caster (ap-
prox.) 1/4°.
Camber - change shims at both the front and rear of
the shaft.
Adding an equal number of shims at both front and
rear of the support shaft will decrease positive cam-
ber. One shim (1/32") at each location will move
camber (approx.) 1/5° (Chevelle and Camaro); 1/6°
(Corvette).
TIGHTEN TO LOCK
ADJUSTMENT
Fig.
7 - Caster and Camber Adjustment Points - Chevrolet
CHEVROLET CHASSIS SERVICE MANUAL
Page 172 of 659
FRONT SUSPENSION 3-8
REPAIR PROCEDURES
Unless otherwise indicated all repair procedures will
apply to all five vehicles covered in this manual.
CAUTION: During any operations which in-
clude breaking the ball stud loose from the
knuckle boss extreme care must be used to as-
sure that the ball stud seal is not damaged or
cut. A recommended way to loosen the stud is to
place a flat bar stock against the knuckle boss
and strike the bar rather than the knuckle.
FRONT BRAKE DRUM-CHEVROLET, CAMARO,
CHEVELLE, CHEVY It
Removal
1.
Remove hub caps, partially loosen wheel nuts and
raise vehicle from floor. Remove wheel nuts and
wheel.
2.
Remove brake drum. In some cases it may be nec-
essary to back off brake adjustment because of
scored drum or unevenly worn brake linings.
3.
Check brake drum for concentricity, damaged pilot
diameter or scored braking surface. Lightly sand
braking surface and wipe clean.
Installation
1.
Install drum over hub bolts making sure alignment
dowel on drum web indexes with hole in wheel hub.
This will assure proper drum alignment with hub
bolts and hub pilot diameter.
2.
Install wheel and partially tighten wheel nuts.
3.
Re-adjust brake shoes to original setting. It may be
necessary to re-adjust brake shoes on both front
and/or rear wheels to assure balanced brake adjust-
ment. See Section 5 for brake adjustment procedure.
4.
Lower vehicle to floor, tighten hub wheel nuts and in-
stall hub cap.
FRONT WHEEL HUB
Replacement
1.
Remove hub caps, break loose the wheel stud nuts
VM" DIA. PIPE OR ARBOR
>l
INNER CUP
OUTER CUP
JL
RADIUS
e^
Fig.
10 - Pressing Front Hub Bolts (Typical)
Fig.
11 - Front Wheel Bearing Cop Removers
and raise vehicle. Remove wheel nuts, wheel and
tire and brake drum or (on Corvette) brake caliper
and brake disc.
NOTE:
On the Corvette, the hub and brake disc
are serviced as a complete assembly.
2.
Pry out hub grease cap, cotter pin, spindle nut and
washer,
and
remove hub. Do not drop wheel bearings.
3.
Reverse this procedure to install.
Replacement of Wheel Hub Bolts
It may be necessary to replace damaged wheel hub
bolts.
In this case, service the hub in the following
manner.
1.
Remove the hub bolts with a press or hammer.
These bolts are not peened into the hub. Do not
damage wheel mounting surface on hub flange.
2.
Install new serrated bolt into hole in
hub.
Tap lightly
with a hammer to start bolt serrations in hole, mak-
ing sure that bolt is square with hub flange.
3.
Press bolt into flange until head is fully seated
against hub flange (fig. 10).
FRONT WHEEL BEARINGS
Removal '
1.
Remove wheel hub as described above.
NOTE: Discard cotter pin. Install new cotter
pin when assembling.
2.
Remove outer roller bearing assembly from hub with
fingers. The inner bearing assembly will remain in
the hub and may be removed after prying out the
inner bearing lip seal assembly. Discard seal.
3.
Wash all parts thoroughly in cleaning solvent and
blow dry.
CHEVROLET CHASSIS SERVICE MANUAL
Page 174 of 659
FRONT SUSPENSION 3-10
CHEVROLET, CHEVELLE, CAMARO AND CORVETTE (TYPICAL)
CHEVY H
Fig.
14- Shock Absorber
NOTE:
If necessary, tighten one more notch to
insert cotter pins.
3.
Place brake backing plate and wheel cylinder in posi*-
tion on steering knuckle and insert anchor pin.
4.
Place steering arm in position on back of steering
knuckle and insert two bolts through backing plate,
steering knuckle and steering arm. Install locknuts
and tighten. (See Specifications.)
5. Torque brake anchor pin (See Specifications).
6. Install brake shoes, except Corvette. (See Section 5.)
7. Install wheel hub, brake drum (or, on Corvette--
brake caliper and disc and hub assembly), wheel and
tire assembly over spindle.
8. Insert outer wheel bearing race and roller assembly,
washer and nut. Adjust front wheel bearing as shown
under Maintenance and Adjustments in this section.
Install new cotter pin, dust cap and hub cap.
9. Lower vehicle, recheck and readjust wheel alignment
where necessary.
SHOCK ABSORBER
Chevrolet, Chevelle, Comoro and Corvette (Fig. 14)
Removal
1.
With an open end wrench hold the shock absorber
upper stem from turning, and then remove the upper
stem retaining nut, retainer and rubber grommet.
2.
Remove the two bolts retaining the lower shock ab-
sorber pivot to the lower control arm and pull the
shock absorber assembly out from the bottom.
Installation
1.
With the retainer and rubber grommet in place over
the upper stem, install the shock abosrber (fully ex-
tended) up through the lower control arm and spring
so that the upper stem passes through the mounting
hole in the upper support arm.
2.
Install the rubber grommet, retainer' and attaching
nut over the shock absorber upper stem.
3.
With an open end wrench, hold the upper stem
from turning and tighten the retaining nut. (See
Specifications.)
4.
Install the two bolts attaching the shock abosrber
lower pivot to the lower control arm and tighten.
(See Specifications.)
Fig.
15 - Upper Control Arm Support Installed - Chevy II
CHEVROLET CHASSIS SERVICE MANUAL
Page 191 of 659
SECTION
4
REAR SUSPENSION
AND
DRIVE LINE
CONTENTS
OF
THIS SECTION
Page
Rear Suspension
4-1
Drive Line.
. 4-26
Rear Axle ......
4-26
Propeller Shaft
and
Universal Joints
Special Tools
4-37
4-43
REAR SUSPENSION
INDEX
General Description
4-1
Chevrolet
4-1
Chevelle
4-1
Chevy
n and
Camaro
. . . . . 4-2
Corvette
. . . . . . 4-3
Maintenance
and
Adjustments ...............
4-4
Riding Height Check (Chevrolet, Camaro,
Chevelle
and
Chevy
II) 4-5
Wheel Alignment (Corvette)
4-5
Wheel Bearing Adjustment (Corvette)
4-6
Component Parts Replacement (Chevrolet, Camaro,
Chevelle
and
Chevy
JJ) 4-7
Coil Spring
4-7
Chevrolet
4-7
Removal
4-7
Installation
4-7
Chevelle
4-8
Removal
4-8
4-8
Installation
.
Leaf Spring, Spring Seat Pads, Spring
Eye
Bushings
4-9
Chevy
H 4-9
Removal
4-9
Installation
4-9
Camaro
4-10
Removal
4-10
Installation
4-11
Shock Absorber
4-11
Chevrolet
and
Chevelle
. 4-11
Removal
4-11
Installation
. . 4-12
Chevy
II 4-12
Removal
4-12
Installation
4-rl2
Camaro
4-12
Removal
. 4-12
Installation
4-12
Control
Arm . . 4-12
Chevrolet Upper
4-12
Removal
. 4-12
Page
Bushing Replacement
. 4-13
Installation
4-14
Chevrolet Lower
4-14
Removal
4-14
Bushing Replacement
4-14
Installation
. 4-15
Chevelle Upper
and
Lower.
. 4-15
Removal
4-15
Bushing Replacement
4-15
Installation
4-17
Rear Suspension
Tie Rod
(Chevrolet)
. . .
......
. . . 4-17
Removal
4-17
Bushing Replacement
4-17
Installation
4-17
Component Parts Replacement (Corvette)
. . 4-17
Wheel Spindle
and
Support
4-17
Removal
4-17
Repairs
', . 4-17
Installation
4-18
Differential Carrier Support Bracket Replacement.
. 4-20
Shock Absorber
4-20
Removal
4-20
Installation
* .... 4-20
Strut
Rod and
Bracket
4-20
Removal
4-20
Repairs
4-21
Installation
4-21
Spring
4-21
Removal
4-21
Repairs
4-22
Installation
4-22
Torque Control
Arm 4-23
Removal
4-23
Repairs
. 4-23
Installation
4-24
Suspension Crossmember
4-24
Removal
4-24
Repairs—Isolation Mount
4-25
Installation
4-25
Stabilizer Shaft Replacement
4-25
GENERAL DESCRIPTION
CHEVROLET
The link type rear suspension (fig. 1) has two lower
control arms which maintain proper axle to frame re-
lationship and also take the acceleration, drive and
braking forces. A single upper control arm on light-
duty models (or two upper control arms on heavy-duty
models and all station wagons) limits axle rotation when
drive, acceleration or braking forces are applied. Lateral
movement of the axle is restricted by the axle-to-frame
tie rod. Two full coil springs and two direct, double
acting shock absorbers are provided for additional ride
control.
CHEVELLE
The rear suspension (fig. 2) is of the four-link design
utilizing axle mounted, full coil springs and direct,
double-acting shock absorbers.
Two rubber-bushed lower control arms, stretching
slightly outboard from axle-mounted brackets to frame
side member mounted brackets, maintain fore and aft
CHEVROLET CHASSIS SERVICE MANUAL
Page 195 of 659
REAR SUSPENSION AND DRIVE LINE 4-5
Fig.
6—Measuring Rear Riding Height (Chevrolet and Chevelle)
RIDING HEIGHT CHECK
(Chevrolet, Chevelle Camaro and Chevy II)
In case of vehicle riding height complaints, a spring
height check will show if the rear suspension is at the
right height.
1.
Position car on smooth level floor.
2.
Vehicle must be at curb weight (full gas tank, no
passengers, spare and jack in trunk). Car should be
raised up a few times to allow suspension to settle
with car weight to eliminate friction at arm pivots.
3.
On Chevrolet and Chevelle models, measure riding
Fig.
8—Measuring Rear Riding Height (Camaro)
height as the distance from the top of the axle hous-
ing to frame kick-up (fig. 6).
4.
On Chevy II models, measure riding height as the
distance from lower surface of bumper support
bracket to top of axle housing (fig. 7).
5.
On Camaro models measure riding height as the
distance from jounce bumper upper attaching bolt to
top of axle housing (fig. 8).
6. Riding heights vary between models* Refer to speci-
fications section for vehicle and model application.
WHEEL ALIGNMENT (CORVETTE)
Camber
Wheel camber angle is obtained by adjusting the eccen-
tric cam and bolt assembly located at the inboard mount-
ing of the strut rod (fig. 9). Place rear wheels on
alignment machine and determine camber angle. To
adjust, loosen cam bolt nut and rotate cam and bolt as-
sembly until specified camber is reached. Tighten nut
securely and torque to specifications.
Fig.
7—Rear Riding Height (Chevy II)
Fig.
9—Ad
justing
Rear Wheel Camber (Corvette)
CHEVROLET CHASSIS SERVICE MANUAL
Page 220 of 659
REAR SUSPENSION AND DRIVE LINE 4-30
Fig.
76—Differential Gear Failure
Hypoid Gears
Hypoid gear tooth scoring (fig. 74) is caused generally
by improper break-in, incorrect lube, insufficient gear
backlash or improper 'ring/pinion gear alignment. The
scoring will progressively lead to complete erosion of
the gear tooth, or gear tooth pitting and eventual fracture
with possible attendant damage to bearings, if the initial
scoring condition is not diagnosed in time and corrected.
Hypoid gear scoring is easily recognized by its char-
acteristic loud whine in either drive, coast or under both
conditions. Another cause of hypoid tooth fracture (fig.
75) is extended overloading of the gear set which will
produce fatigue fracture, or shock loading which will
result in sudden failure.
Differential Gears
Common causes of differential gear failure are shock
loading, extended overloading leading to fatigue failure,
and overheating of gear thrust surfaces resulting from
excessive wheel spin and consequent lubrication break-
down. Overheating will lead to seizing of thrust surfaces
or tooth failure (fig. 76).
Bearings
• Failure of axle tapered roller bearings is due pri-
marily to excessive wear caused by long service or
foreign materials in the oil. The second most common
cause of bearing failure is too tight or too loose pre-
load adjustment leading to spalling and eventual failure.
This failure may also lead to hypoid gear scoring due to
the resultant misalignment of the hypoid gear set.
COMPONENT PARTS REPLACEMENT
(Chevrolet, Cheveile, Chevy II and Camaro)
AXLE ASSEMBLY
Removal
1.
Raise vehicle to a height that will permit axle as-
sembly to hang freely and position supports under
both frame side rails.
2.
Disconnect wheel cylinder inlet lines. Disconnect and
remove brake hose and brake line retaining bracket
by removing retaining bolt from carrier cover.
3.
Loosen parking brake equalizer adjusting nut and
disconnect both rear cables at frame bracket and at
control arms. See Section 5 for detail of parking
brake cable removal.
4.
Remove two trunnion bearing "U" bolts from the
rear yoke and separate rear universal joint. Wire
propeller shaft to frame side rail and tape trunnion
bearing cups.
5. Support arid secure axle assembly with an adjustable
lifting device. On Chevrolet and Cheveile models,
loosen upper and lower control arm attaching bolts
at axle housing. (On Chevrolet models, disconnect
tie rod at axle bracket.)
6. Disconnect shock absorbers at axle brackets. Refer
to Shock Absorber Removal procedures outlined in
this section.
7. On Chevrolet and Cheveile models, lower axle as-
sembly until suspension reaches end of travel, then
disconnect spring retainers and withdraw springs
from vehicle.
8. On Chevy II and Camaro models, remove four nuts
securing lower spring seat to axle housing, then
remove spring front eye bolts or spring attaching
bracket and swing spring to rear so that it does not
interfere with axle.
9. On Chevrolet and Cheveile models, disconnect upper
and lower control arm attaching bolts at axle housing*
10.
Lower axle assembly and remove from under vehicle.
Installation
1.
Place axle assembly under vehicle and raise into
position.
2.
On Chevrolet and Cheveile models, install, but do not
tighten, upper and lower control arm attaching bolts
at axle housing.
3.
On Chevrolet models, position coil springs in upper
seats so that end of spring is indexed in seat.
4.
On Chevrolet models, install lower end of spring on
axle bracket or control arm and secure by installing
retainer and bolt. Install lock washer and retainer
nut.
5. On Cheveile pry lower pigtail of spring over vertical
flange of the axle bracket spring seat.
6. On Chevy II and Camaro models, install spring seat
pads and swing springs up into spring seats on axle
housing, making sure upper seat pads are aligned in
axle housing bracket.
7. Install spring front eye bolt and tighten, then install
spring seat lower mounting bracket and retaining
nuts.
8. Raise axle assembly to allow shock absorber and tie
rod installation. Position shock absorber in axle
bracket. Torque nut as outlined in Shock Absorber
Installation procedures.
9. Install brake hose and brake line retaining bracket
to carrier and connect wheel cylinder inlet lines.
Connect parking brake cable to frame bracket and
at control arm. Adjust parking brake and bleed
brakes as outlined in Section 5.
10.
Reassemble rear universal joint to companion flange.
11.
Support vehicle at axle and remove supports from
beneath the frame side rails.
12.
Remove supports and lower vehicle to floor. Torque
all affected parts to specifications.
CHEVROLET CHASSIS SERVICE MANUAL
Page 263 of 659
BRAKES 5-30
CAUTION: Be sure the emergency brake ad-
justing, holes of the spindle and disc are in
alignment.
2.
Install the brake caliper and shoes as outlined in
this section.
3.
Bleed the brakes as outlined in this section.
4.
Install wheel and tire assembly and lower vehicle.
MAIN CYLINDER
The service operations for the main cylinder are the
same as for Duo-Servo main cylinder. Refer to service
procedures under Duo-Servo Brakes.
PARKING BRAKE SHOES
Corvette (Fig. 44)
Removal
1.
Remove tire and wheel assemblies and brake disc
as outlined in this section.
2.
Remove retractor spring at the top of the shoes.
Remove hold down springs on primary and secondary
shoes.
3.
Remove shoes by pulling them away from the anchor
pin.
4.
Remove the adjusting screw spring and adjusting
screw from the shoes.
Installation
1.
Put light coat of lubriplate on pads, backing plate,
and the threads of the adjusting screw.
2.
Attach adjusting screw spring to the bottom hole in
each shoe.
3.
Insert the star wheel between the shoes. (On left
hand brakes, the star wheel goes next to the rear
shoe; on right hand brakes, the star wheel goes next
to
the.
forward shoe).
4.
Install the shoes on the backing plate by spreading
them and placing them around the anchor pin.
5. Install the hold down springs on the hold down nails.
Fig.
44-Exploded View of Parking Brake Shoes
1.
Parking Brake Shoe
2.
Hold Down Spring and Cap
3. Hold Down Pin
4. Actuating Lever
5. Retractor Spring
6. Backing Plate
7. Parking Plate
8. Hold Down Spring and Cap
9. Adjusting Screw Spring
0, Adjusting Screw Assembly
6. Install retractor spring on one shoe and stretch to
other shoe.
CAUTION: Make sure that the lever assembly
which spreads the shoes is located so that the
notches on the lever fit against the shoes.
7. Install disc and caliper as outlined in. this section.
8. Bleed brakes as outlined in this section.
9. Adjust the parking brake as outlined in this section.
10.
Install wheels and lower vehicle.
CHEVROLET CHASSIS SERVICE MANUAL
Page 264 of 659
BRAKES
5-31
POWER BRAKES
INDEX
General Description 5-31
Maintenance
and"
Adjustments 5-31
Inspection . ... 5_31
Lubrication 5-31
Bleeding Instructions . . . 5.31
Air Cleaner Service . . . , 5.31
Page
Component Replacement 5-31
Power Brake Cylinder ......* 5-31
Removal . . 5-31
Disassembly and Assembly See Overhaul Manual
Installation . . . . 5-31
GENERAL DESCRIPTION
The Power Brake Unit is a self-contained hydraulic
and vacuum unit, utilizing manifold vacuum and atmos-
phere pressure for its power.
This unit permits the use of a low brake pedal as well
as less pedal effort than is required with the conventional
(nonpower) hydraulic brake system. Only two external
line connections are necessary -
one
a vacuum connection
from manifold to check valve located on front shell; the
other, a hydraulic connection from the main cylinder
outlet directly into the hydraulic system. The unit is
mounted on the engine side of the fire wall and directly
connected to the brake pedal.
MAINTENANCE AND ADJUSTMENTS
INSPECTIONS
1.
Check vacuum line and vacuum line connections as
well as vacuum check valve in front shell of power
unit for possible vacuum loss.
2.
Inspect all hydraulic lines and connections at the
wheel cylinders and main cylinder for possible
hydraulic leaks.
3.
Check brake assemblies for scored drums, grease
or brake fluid on linings, worn or glazed linings,
and make necessary adjustments.
4.
Check brake fluid level in the hydraulic reser-
voirs.
The reservoirs should be filled to the levels
shown in Figure 8.
5. Check for loose mounting bolts at main cylinder and
at power section.
6. Check air cleaner filter in power piston extension
and replace filter if necessary.
7. Check brake pedal for binding and misalignment
between pedal
-and
push rod.
LUBRICATION
The power brake unit is lubricated at assembly and
needs no further lubrication other than maintaining
normal reservoir fluid level. The reservoir should be
filled as described in this section.
BLEEDING INSTRUCTIONS
The power system may be bled manually or with a
pressure bleeder as outlined in this section. Use only
GM
Supreme 11 Brake Fluid or equivalent. Do not use the
power assist while bleeding. The engine should not be
running and the vacuum reserve should be reduced to
zero by applying the brake several times before starting
the bleeding procedure.
AIR CLEANER SERVICE
Servicing of the air cleaner is recommended and the
element replaced when restriction becomes severe
enough to affect power brake response. At any other
time, if cleaning of the filter is felt necessary, it should
be shaken free of dirt or washed in soap and water and
thoroughly dried.
COMPONENT REPLACEMENT
POWER BRAKE CYLINDER
Removal
1.
Remove vacuum hose from vacuum check valve.
2.
Disconnect hydraulic lines at main cylinder.
Disconnect push rod at brake pedal assembly.
Remove nuts and lock washers securing power unit
to fire wall, and remove power unit from engine
compartment.
3.
4.
NOTE:
Chevy
to fire wall.
has a three stud attachment
Repair procedures for the power cylinder are outlined
in the Brake Section of the Overhaul Manual-for service
of the main cylinder refer to applicable portion of
"Standard Brakes" in this manual.
Installation
1.
Mount the power brake assembly in place and install
the attaching nuts and lock washers.
2.
Attach vacuum line to check valve.
3.
Secure hydraulic lines to main cylinder.
4.
Attach push rod to brake pedal assembly, and check
operation of stop light.
5. Bleed brakes as outlined in this section.
CAUTION: After replacing the unit on the vehi-
cle,
start the engine and allow vacuum to build
up before applying the brake.
CHEVROLET CHASSIS SERVICE