brake pads CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual

REAR SUSPENSION AND DRIVE LINE 4-9

Fig.
17—Rear Spring—Exploded View (Chevy II)

LEAF SPRING, SPRING SEAT PADS, SPRING EYE

BUSHINGS Chevy II (Fig. 17)

Removal

1.
Raise vehicle and support rear axle assembly.

2.
Pull parking brake cable out of lower spring pad

mounting bracket clamp and disconnect cable above

axle housing. Remove four nuts securing lower

spring pad mounting bracket to axle spring seat

(fig. 18). Drop lower bracket and remove rubber

spring pad.

3.
Loosen and drive out front spring eye bolt. Lower

spring and remove front rubber eye bushing (fig. 19).

4.
Remove nuts from rear spring shackle (fig. 20),

spread shackle to separate it from spring eye and

support bracket and remove spring. Remove rear

spring eye bushings.

5.
Remove upper spring pad cushion.

Installation

1.
Inspect spring eye bushings and spring pads for ex-

cessive wear or aging and replace as necessary.

Inspect spring rear shackles, front spring bracket

and eye bolt for bending or cracking and correct

where needed.

2.
Assemble spring rear shackle as follows:

a. All except Station Wagons (fig. 21).
Fig.
19—Removing Front Eye Bushings (Chevy II)

3.
' Fig. 20—Disassembling Rear Spring Shackle (Chevy II)

1.
Insert inboard rubber spring eye bushings into

i'ear spring eye and outboard shackle bushings

into shackle mounting bracket.

2.
Position spring and install shackle to spring

and mounting bracket with top nut toward out-

board of vehicle and bottom nut toward vehicle

centerline.

3.
Tighten nuts but-do not torque at this point,

b.
Station Wagon (fig. 22):

When installing shackle as in Step 2 above, top

nut should be toward centerline of vehicle and

bottom nut toward outboard of vehicle.

Insert inboard rubber bushing into front spring eye.

Fig.
18—Removing Lower Pad Bracket (Chevy II)
Fig.
21—Rear Spring Shackle Exploded View-All

Except Station Wagon (Chevy II)

CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-11

lower cushion

correct.
will be aligned if installation is

Fig.
25—Installing Spring Front Bushing (Camaro)

Unnecessary torque applied after flange is

seated will tend to distort flange and reposition

bushing in spring.

i. Disassemble bushing installation tools and re-

move from spring.

8. Pry parking brake cable out of the retainer bracket

mounted on the spring mounting plate.

9. Remove spring bracket-to-axle bracket retaining

nuts,
remove upper and lower rubber spring pads

and bracket.

10.
Support spring, then remove lower bolt from spring

rear shackle. Separate shackle and withdraw spring

from vehicle.

11.
Remove rear spring shackle upper bolt and withdraw

shackle bushings from frame.

Installation

1.
Position spring front mounting bracket to spring

front eye. Spring attaching bolt must be installed

so that head of bolt is toward center of vehicle.

2.
Position spring shackle upper bushings in frame,

position shackles to bushings and loosely install

bolt and nut.

3.
Install bushing halves in spring rear eye, place

spring to shackles and loosely install shackle lower

bolt and nut.

NOTE: When installing spring, make sure

spring is positioned so that parking brake cable

is on underside of spring.

4.
Raise front end of spring and position bracket to

underbody. Guide spring into position so that it will

index in the axle bracket and also make sure that

the tab on spring bracket is indexed in slot pro-

vided in the underbody.

5.
Loosely install spring-to-underbody bracket.

6. Position spring upper cushion between spring and

axle bracket so that spring cushion ribs align with

axle bracket locating ribs.

7.
Place lower spring cushion on spring so that .cushion

is indexed on locating dowel. Upper cushion and
8. Place lower mounting plate over locating dowel on

spring lower pad and loosely install retaining nuts.

9. If new mounting plate was installed, transfer parking

brake cable retaining bracket to new plate.

10.
Position shock absorber to spring mounting plate and

loosely install eye bolt and nut - head of bolt should

be toward front of vehicle.

11.
Position parking brake cable in retaining bracket and

securely clamp bracket to retain cable.

12.
Remove stand jacks and lower vehicle so that weight

of vehicle rests on suspension components. Torque

all affected parts to specifications.

SHOCK ABSORBER

Chevrolet and Chevelle

Removal

1.
Raise rear of vehicle and support rear axle

assembly.

If equipped with superlift shock absorber, disconnect

air line from shock absorber.

Disconnect shock absorber at upper mounting bracket

by removing the two retaining bolts. Refer to Figure

26 for shock absorber mounting details. (Chevelle

components shown as typical.)

Disconnect shock absorber at lower attaching bracket

and remove shock.

NOTE: When performing any service opera-

tions that requires removal or loosening of the

lower attaching nut, it is essential that the stud

be prevented from turning. A hex is located on

the stud between the axle bracket and shock

absorber in order that a wrench may be used

for this purpose. Failure to hold the stud in

this manner will result in damage to the mer

chanical bond between the shock absorber bush-

ing and the mounting stud.
2.

3.

STATION WAGON AND PICKUP

Fig.
26—Shock Absorber Mounting—Exploded View

(Chevelle)

CHEVROLET CHASSIS SERVICE MANUAL

REAR SUSPENSION
AND
DRIVE LINE
4-26

DRIVE LINE

REAR AXIE

INDEX

Page

General
Description
4-26

Chevrolet,
Camaro,
Chevelle
and
Chevy
II 4-26

Corvette
4-26

Maintenance
and
Adjustments
4-27

Lubricant
4.37

Lubricant'
Leaks
4_27

Axle Bolts
and
Wheel
Nuts
4-27

Rear Axle Noise
Diagnosis
4-29

Gear Noise
4_29

Bearing
Noise
4-29

Failure
Analysis
4^9

Hypoid
Gears
4..3Q

Differential Gears. 4_30

Bearings
....'.
4.30

Component Parts Replacement

(Chevrolet, Chevelle, Camaro and Chevy n ..... 4.30

Axle Assembly ,. . 4_30

Removal 4 30

Installation * ' 4 3Q
Axle Shaft . . . 4-31

Removal 4-31

Wheel Bolt Replacement 4-31

Oil Seal and/or Bearing Replacement. 4-31

Brake Flange Plate Replacement 4-31

Installation 4-32

Pinion Flange, Dust Deflector and/or

Oil Seal Replacement 4-32

Component Parts Replacement (Corvette) 4-34

Axle Driveshaft .- 4-34

Removal 4-34

Repairs 4-34

Installation. . 4-34

Pinion Flange, Dust Deflector and/or Oil Seal. .... 4-35

Removal 4-35

Inspection . 4-35

Installation .- 4-35

Differential Carrier 4-36

Removal 4-36

Installation 4-36

Positraction Differential Unit-On the Vehicle Check . . 4-37

\

GENERAL DESCRIPTION

CHEVROLET, CHEVELLE, CHEVY
I! AND
CAMARO

The rear axle
(fig. 72) is a
semifloating, fabricated

construction type consisting
of a
cast carrier with large

bosses
on
each
end
into which
two
welded steel tubes

are fitted.
The
carrier contains
an
overhung hypoid

pinion
and
ring gear.
The
differential
is a
two pinion

arrangement.

The axle housing
is
made up
of
two steel welded tubes

pressed into
the
crossbore
of the
cast carrier
-
each

tube
is
puddle welded
at
three places
to the
carrier.

Welded-on brackets provide attachment points
for

Chevelle springs,; shock absorbers,
and
lower control

arms.
Chevrolet models have welded-on brackets
for

control arms,
tie
rod, and shock absorbers. The housing

on Chevy II and Camaro has welded brackets
for
mounting

lower spring
pad
and shock absorber.
A
welded flange
is

provided
for
brake flange plate attachment.

The overhung hypoid drive pinion
is
supported
by
two

preloaded tapered roller bearings.
The
pinion shaft
is

sealed
by
means
of a
molded, spring loaded, rubber seal.

The seal
is
mounted
on the
pinion shaft flange which
is

splined and bolted
to
the hypoid pinion shaft.

The hypoid ring gear
is
bolted
to a
one-piece differen-

tial case which
is
supported
by two
preloaded tapered

roller bearings.

CORVETTE

The Corvette rear axle
is of the
type where
the dif-
ferential carrier housing enclosing
the
differential
and

hypoid gears
is
supported
on a
crossmember mounted
to

the chassis frame.
The
differential
is
connected through

universal joints
to the
drive shafts
and
wheels
(fig. 73).

The internal components
of the
carrier
are of
conven-

tional design, incorporating
a
hypoid gear
set
with
an

overhung pinion supported
on two
pre-loaded, tapered

roller bearing assemblies,
and a
two-pinion differential

assembly supported
on
tapered roller bearings. Pinion

mounting distance adjustments
are
made through the
use

of shims,
as are the
differential bearing pre-load
and

backlash adjustments.
The
differential side gears drive

two splined yokes which
are
retained laterally
by
snap

rings located on the yoke splined end. The yokes
are
sup-

ported on caged needle bearings pressed into
the
carrier,

adjacent
to the
differential bearings.
A
lip seal, pressed

in outboard
of
the bearings, prevents
oil
leakage and dirt

entry.
The
carrier cover
is
bolted
to the
carrier and

provides accessibility
to the
internal parts.
The
cover

incorporates two integral, reinforced mounting pads which

serve
as the
carrier attaching point
to the
suspension

crossmember,
and an
attaching point
for the
spring

center section. The filler plug
is
located on the right side

of the cover near the bolting flange.

All service operations allow carrier removal without

removing
the
carrier cover. Cover removal
is
not nec-

essary
in any of the
service procedures except
in
the

case
of
complete carrier housing replacement,
as the

carrier and cover
are
serviced
as
an assembly.

CHEVROLET CHASSIS SERVICE MANUAL

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

BRAKES
5-18

Fig.
30—Checking
Operation
of the
Actuating
Lever
2.
Make six to eight complete stops from maximum

legal highway speed at approximately one mile inter-

vals to fully seat the linings.

Identification of Worn Lining (Fig. 31)

The metallic shoe assembly incorporates a number of

segmented pads with each pad consisting of two layers of

dissimilar material. The top layer is the braking ma-

terial and the lower layer is a metal bonding agent used

to weld the brake facing material to the shoe proper.

During brake inspection, one can be misled easily

since the bonding pad does not appear to be much dif-

ferent from the brake facing pad.

Close inspection of the shoes, however, will indicate

the difference between a worn and satisfactory shoe.

When the bonding pad begins to appear through the brake

facing material a bright finish will appear (fig. 31).

To preclude the possibility of excessively worn shoes

damaging the drum, it is recommended that metallic

brake shoes be replaced whenever segment thickness

becomes less than 3/32" measured at the heel or toe

of the pad.

MAIN CYLINDER

When servicing the Delco Moraine dual master cyl-

inder, follow the rules below when replacing either

complete master cylinder or the component pistons of

the cylinder. It is equally important to use 'only the

NORMAL

WORN

EXCESSIVELY
WORN

BRAKE

SHOE
PAD PART

'OF SHOE

•FACING

MINIMUM

•SERVICEABLE

LINING
%2
BRAKE

SHOE
PAD PART

OF SHOE

FACING
BRAKE

SHOE
PAD PART

OF SHOE

FACING

SEC
A-A

SEC
B-B

SEC
C-C

Fig. 31—Identification of Worn Metallic Brake Lining

CHEVROLET CHASSIS SERVICE MANUAL

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