brake fluid CHEVROLET CAMARO 1967 1.G Chassis Workshop Manual
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Page 15 of 659
LUBRICATION 0-13
LUBRICATION
INDEX
Page
Engine Crankcase Oil . 0-13
Crankcase Capacities. . 0-13
Lubrication . ,
•
o-13
SAE Viscosity Oils 0-13
Types of Oils 0-14
Maintaining Oil Level 0-14
Oil and Filter Change Intervals 0-14
Oil.
. . ...:.. 0-14
Filter o-14
Crankcase Dilution . 0-14
Automatic Control Devices to Minimize
Crankcase Dilution 0-14
Crankcase Breather Cap 0-14
Crankcase Ventilation System 0-15
Valve Type 0-15
Fuel Filter 0-15
Air Cleaner . 0-15
Polyurethane Type 0-15
Oil Wetted Paper Element Type 0-15
Battery Terminal Washers 0-15
Page
Distributor 0-15
Rear Axle and 3-Speed and Overdrive
4-Speed Transmission 0-15
Recommended Lubricants 0-15
Multi-Purpose Gear Lubricants 0-15
Lubricant Additions 0-15
Lubricant Changes 0-15
Powerglide Transmission 0-15
Turbo Hydra-Matic 0-16
Front Wheel Bearings 0-16
Manual Steering Gear . . . . 0-16
Power Steering 0-16
Air Conditioning 0-16
Brake Master Cylinder. 0-16
Parking Brake 0-16
Clutch Cross-Shaft , 0-16
Chassis Lubrication 0-16
Lubrication Diagrams . . 0-19
Body Lubrication (Chevrolet, Chevelle, Chevy n, Camaro). 0-20
Body Lubrication Points (Corvette) . 0-21
The selection of the proper lubricant and its correct
application at regular intervals does much to increase the
life and operation of all moving parts of the vehicle.
Consequently, it is important that the correct grade of
oil or grease, as noted in the following pages, be used.
ENGINE CRANKCASE OIL
Crankcase Capacity
4 Cylinder 4 qt.
6 Cylinder 4 qt.
8 Cylinder (283) 4 qt.
8 Cylinder (327) 4 qt.
8 Cylinder (350) 4 qt.
8 Cylinder (396) 4 qt.
8 Cylinder (427) Chevrolet 4 qt.
8 Cylinder (427) Corvette 5 qt.
For 4 Cyl. Add .5 qt. with filter change;
1 qt. for 6 and 8 Cyl. engines.
Lubrication
Crankcase oil should be selected to give the best per-
formance under the climatic and driving conditions in the
territory in which the vehicle is driven.
During warm or hot weather, an oil which will provide
adequate lubrication under high operating temperatures
is required.
During the colder months of the year* an oil which will
permit easy starting at the lowest atmospheric tempera-
ture likely to be encountered, should be used.
When the crankcase is drained and refilled, the crank-
case oil should be selected, not on the basis of the exist-
ing temperature at the time of the change, but on the
lowest temperature anticipated for the period during
which the oil is to be used.
Unless the crankcase oil is selected on the basis of
viscosity or fluidity of the anticipated temperature, dif-
ficulty in starting will be experienced at each sudden
drop in temperature.
SAE Viscosity Oils
SAE Viscosity Numbers indicate only the viscosity or
body of the oil, that is, whether an oil is a light or a
heavy body oil, and do not consider or include other
properties or quality factors.
The lower SAE Viscosity Numbers, such as SAE 5W
and SAE 10W which represent the light body oils, are
recommended for use during cold weather to provide
easy starting and instant lubrication. The higher SAE
Viscosity Numbers such as SAE 20 and SAE 20W, which
represents heavier body oils, are recommended for use
during warm or hot weather to provide improved oil
economy and adequate lubrication under high operating
temperatures.
Oils are available which are designed to combine the
easy starting characteristics of the lower SAE Viscosity
Number with the warm weather operating characteristics
of the higher SAE Viscosity Number. These are termed
"multi-viscosity oils," SAE 5-10W, SAE 5W-20, SAE
10W-20W, and SAE 10W-30.
The following chart will serve as a guide for the
selection of the correct SAE Viscosity Number for use
under different atmospheric temperature ranges, and
suggests the appropriate SAE Viscosity Numbers when
multi-viscosity oils are used.
Lowest Anticipated
Temperature
During Time
Oil Will Be
in Crankcase
32°F.
0°F.
Below 0°F.
Recommended
SAE Viscosity
Oils
SAE 20 or 20W
SAE 10W
SAE 5W
Recommended
SAE
Multi-
Viscosity
Oils
SAE 10W-30 .
SAE 10W-30
SAE 5W-20
SAE 30 or 10W-30 is recommended when most of the
driving is at high speeds and/or at temperatures above
90
°F.
CHEVROLET CHASSIS SERVICE MANUAL
Page 17 of 659
LUBRICATION 0-15
CRANKCASE VENTILATION VALVE
VALVE TYPE
NOTE: Under prolonged dusty driving condi-
tions,
it is recommended that these operations
be performed more often. Every 12,000 miles
or 12 months the valve should be replaced.
Connecting hoses, fittings, flame arrestor and
crankcase breather cap (where used) should be
cleaned. At every oil change the system should
be tested for proper function and serviced, if
necessary.
FUEL FILTER
Replace filter element located in carburetor inlet if
flooding occurs, if engine surges during constant speed
operation (pulsating effect) or if poor performance is
experienced during acceleration or at higher speeds.
AIR CLEANER
NOTE: Under prolonged dusty driving condi-
tions,
it is recommended that these operations
be performed more often.
POLYURETHANE TYPE-
Every 12,000 miles clean element in solvent, squeeze
out solvent, then soak in engine oil and squeeze out
excess.
OIL WETTED PAPER ELEMENT TYPE-
First 12,000 miles inspect or test element; if satis-
factory, re-use element but recheck every 6,000 miles
until replaced. Element must not be washed, oiled,
tapped or cleaned with an air hose.
BATTERY TERMINAL WASHERS
Battery terminals have felt washers between top of
case and cable connections to minimize corrosive action
of battery acid. These felt washers should be saturated
with engine oil every 6,000 miles.
DISTRIBUTOR
4 and 6-Cylinder Engine—Remove distributor cap and
rotate lubricator 1/2 turn at 12,000 mile intervals. Re-
place at 24,000 mile intervals.
8-Cylinder Engine—Change cam lubricator end for end
at 12,000 mile intervals. Replace at 24,000 mile
intervals.
REAR AXLE AND 3-SPEED AND
OVERDRIVE, 4-SPEED TRANSMISSIONS
The passenger car operates under the most severe
lubrication conditions at high speed and requires a hypoid
lubricant which will meet this condition.
Recommended Lubricants
Standard Rear Axles—SAE 90 "Multi-Purpose" gear
lubricant.
Positraction Rear Axles—Use special Positraction
lubricant.
CAUTION: Straight Mineral Oil gear lubricants
must not be used in hypoid rear axles.
Transmissions—SAE 90 "Multi-Purpose" gear
lubricant.
The SAE 90 viscosity grade is recommended for year
round use. However, when extremely low temperatures
are encountered for protracted periods during the winter
months, the SAE 80 viscosity grade may be used.
"Multi-Purpose" Gear Lubricants
Gear lubricants that will satisfactorily lubricate hypoid
rear axles have been developed and are commonly re-
ferred to as ' 'Multi-Purpose" gear lubricants meeting
U.S.
Army Ord. Spec. MIL-L-2105B.
These lubricants can also be satisfactorily used in
manual transmissions.
CAUTION: With Positraction rear axles use
special Positraction lubricant.
"Multi-Purpose" gear lubricants must be manufac-
tured under carefully controlled conditions and the
lubricant manufacturer must be responsible for the
satisfactory performance of his product. His reputation
is the best indication of quality.
Lubricant Additions
The lubricant level in the axle and transmission hous-
ings should be checked periodically. (Every 6,000 miles.)
It is recommended that any additions required to bring
up the lubricant level be made using the same type lubri-
cant already in the housing.
When checking lubricant level in transmission or rear
axle the unit being cheeked should be at operating
temperature. With unit at operating temperature the
lubricant should be level with bottom of the filler plug
hole.
If the lubricant level is checked with the unit cold
the lubricant level should be 1/2 inch below the filler
plug hole.
Lubricant Changes
The rear axle lubricant does not require changing for
the life of the vehicle. If additions are needed, or when
refilling the axle after service procedures, use lubricants
described above.
POWERGLIDE TRANSMISSION
NOTE: Every 12,000 miles, it is recommended
that the Powerglide low band be adjusted as
specified in Section 7 of this manual.
Every 6,000 miles--Check fluid level on dipstick with
engine idling, selector lever in neutral position, parking
brake set and transmission at operating temperature. If
fluid level is below full mark on dip stick, adding a small
amount of Automatic Transmission Fluid, General Motors
Automatic Transmission Fluid (Part Numbers 1050568-
69,
70) is recommended. If this fluid is not obtainable,
use Automatic Transmission Fluid Type 'A' bearing the
mark AQ-ATF followed by a number and the suffix letter
'A'.
Recheck fluid level on dip stick and again add a
small amount of fluid if needed to bring level to full
mark. DO NOT OVERFILL.
CHEVROLET CHASSIS SERVICE MANUAL
Page 18 of 659
LUBRICATION 0-16
Every 12,000 miles (more frequently*, depending on
severity of service, if vehicle is used to pull trailers,
carry full loads during high ambient temperatures,
operate in mountainous terrain or operate under other
severe conditions--Remove fluid from the transmission
sump and add one and a half quarts of fresh fluid for
Camaro and Chevy II and two quarts for Chevrolet,
Chevelle, and Corvette. Operate transmission through all
ranges and check fluid level as described above.
•Except if vehicle is equipped with transmission pro-
vided in heavy duty service options. If so equipped,
drain converter and pump every 12,000 miles and add
approximately seven and a half quarts of fresh fluid
for Chevy II and nine quarts for Chevrolet and Chevelle.
TURBO HYDRA-MATIC
Lubrication. recommendations for the Turbo Hydra-
Matic are the same as outlined for the Powerglide
transmission except for fluid capacity and filter change
listed below.
After checking transmission fluid level it is important
that the dip stick be pushed all the way into the fill tube.
Every 12,000 miles — after removing fluid from the
transmission sump, approximately 7 1/2 pints of fresh
fluid will be required to return level to proper mark on
the dip stick.
Every 24,000 miles, or at every other fluid change--
the transmission sump strainer should be replaced.
FRONT WHEEL BEARINGS
It is necessary to remove the wheel and hub assembly
to lubricate the bearings. The bearing assemblies should
be cleaned before repacking with lubricant. Do not pack
the hub between the inner and outer bearing assemblies
or the hub caps, as this excessive lubrication results in
the lubricant working out into the brake drums and
linings.
Front wheels of all passenger car models are equipped
with tapered roller bearings and should be packed with a
high melting point water resistant front wheel bearing
lubricant whenever wheel and hub are removed.
CAUTION: "Long fibre" or "viscous" type
lubricant should not be used. Do not mix wheel
bearing lubricants. Be sure to thoroughly clean
bearings and hubs of all old lubricant before
repacking.
The proper adjustment of front wheel bearings is one
of the important service operations- that has a definite
bearing on safety. A car with improperly adjusted front
wheel bearings lacks steering stability, has a tendency to
wander or shimmy and may have increased tire wear.
The adjustment of these bearings is very critical. The
procedure is covered in Section 3 of this manual under
Front Wheel Bearings—Adjust,
MANUAL STEERING GEAR
Check lubricant level every 36,000 miles. If required,
add EP Chassis Lubricant.
POWER STEERING
On models equipped with power steering gear, check
fluid at operating temperature in pump reservoir. Add
GM Power Steering Fluid, or, if this is not available, use
Automatic Transmission Fluid "Type A" bearing the
mark AQ-ATF followed by a number and the suffix letter
'A'
to bring level to full mark on dip stick.
AIR CONDITIONING
After the first 6,000 miles, check all hose clamp
connections for proper tightness.
Every 6,000 miles check sight glass under the hood,
after the system has been in operation for several
minutes. Sight glass should be clear but may, during
milder weather, show traces of bubbles. Foam or dirt
indicate a leak which should be repaired immediately.
BRAKE MASTER CYLINDER
Check level every 6,000 miles and maintain 1/4" below
lowest edge of each filler opening with GM Hydraulic
Brake Fluid Supreme No. 11.
PARKING BRAKE
Every 6,000 miles, apply water resistant lube to park-
ing brake cable, cable guides and at all operating links
and levers.
CLUTCH CROSS-SHAFT
Periodic lubrication of the clutch cross shaft is not
required. At 36,000 miles or sooner, if necessary;
remove plug, install lube fitting and apply CHASSIS
LUBRICANT.
CHASSIS LUBRICATION
For chassis lubrication, consult the lubrication chart.
It shows the points to be lubricated and how often the
lubricant should be applied.
The term "chassis lubricant" as used in this manual,
describes a water resistant EP chassis grease designed
for application by commercial pressure gun equipment.
CHEVROLET CHASSIS SERVICE MANUAL
Page 19 of 659
LUBRICATION 0-17
LUBRICATE EVERY 6,000 MILES
LUBRICATE EVERY 12,000 MILES
LUBRICATE EVERY 36,000 MILES
Refill Positraction Rear Axle with
Special Lubricant Only.
GL—Multi-purpose
or
Universal Gear Lubricant4
WB-Wheel Bearing Lubricant
(Whenever Brakes are serviced)
CL—Chassis Lubricant
EO-EngineOil
AT-Automatic Transmission Fluid {Type
A)
BF-Brake Fluid
Fig.
32—Lubrication Diagram—Chevrolet
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air Cleaner
5. Crankcase Breather Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master Cylinder
CHEVROLET CHASSIS SERVICE MANUAL
Page 20 of 659
LUBRICATION 0-18
12
LUBRICATE EVERY 6000 MILES GL -Multi-purpose Gear Lubricant*
WB—Wheel Bearing Lubricant
LUBRICATE EVERY 12000 MILES (Whenever Brakes are serviced)
CL —Chassis Lubricant
LUBRICATE EVERY 36000 MILES E°-En9ine°il
"Refill Positraction Rear Axle with Special Positraction Rear Axle
Lubricant Only.
AT —Automatic Transmission Fluid (Type A)
SL —Steering Gear Lubricant
BF -Hydraulic Brake Fluid
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
Fig.
33—Lubrication Diagram—Chevelle
4.
Air Cleaner
5. Crankcase Breather Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master CylincU
CHEVROLET CHASSIS SERVICE MANUAL
Page 21 of 659
LUBRICATION
0-19
.
3-SPEED
4-SPEED
7 OVER DRIVE
10 9 5 1 6 2 '
AUTOMATIC
3 12 11
LUBRICATE EVERY 6,000 MILES GL-Gear Lubricant*
WB-Wheel Bearing Lubricant
(Wh Bk
AT-Automdtic Transmission Fluid
^ WB-Wheel Bearing Lubricant (Type A)
-TV
LUBRICATE
EVERY 12,000 MILES (Whenever Brakes are serviced)
' CL—Chassis Lubricant
• LUBRICATE EVERY 36,000 MILES EO_Engine Oil
BF
-Brake Fluid
•Refill Positt
Special Lubricant Only.
Axl«
with
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
Fig.
34—Lubrication Diagram—Chevy I!
4. Air Cleaner
5. Crankcase Breather. Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9.
Oil Filter
10.
Battery
11.
Parking Brake
12.
Brake Master Cylinder
CHEVROLET CHASSIS SERVICE MANUAL
Page 22 of 659
LUBRICATION 0-20
3-SPEED
4—SPEED
AUTOMATIC
LUBRICATE EVERY 6000 MILES
LUBRICATE EVERY 12000 MILES
LUBRICATE EVERY 36000 MILES
*
Refill
positraction rear axle with
special lubricant only.
GL -GEAR LUBRICANT*
WB-WHEEL BEARING LUBRICANT
(WHENEVER BRAKES
ARE
SERVICED)
CL -CHASSIS LUBRICANT
CO-ENGINE
Oil;
AT -AUTOMATIC TRANSMISSION
FLUID (TYPE
A)
BF -BRAKE FLUID
Fig.
35—Lubricafion Diagram—Camaro
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air Cleaner
5. Crankcase Breathe Cap
6. Front Wheel Bearings
7. Transmission
8. Rear Axle
9. Oil Filter
10.
Battery,
11.
Parking Brake
12.
Brake Master Cylinder
BODY LUBRICATION
See Body Service Manual
for
Body Lubrication,
cept Corvette)
(Ex-
CHEVROLET CHASSIS SERVICE MANUAL
Page 23 of 659
LUBRICATION
0-21
6
3-SPEED
4-SPEED
AUTOMATIC
10
LUBRICATE EVERY 6,000 MILES GL -Multi-purpose
or
Universal Gear Lubrincant*
-(V LUBRICATE EVERY 12,000 MILES WB-Wheel Bearing Lubricant
V/^ (Whenever Brakes
are
serviced)
AT —Automatic Transmission Fluid (Type)
BF -Brake Fluid
a
LUBRICATE EVERY 36,000 MILES
* Refill Positraction Rear Axle with
Special Lubricant Only.
CL -Chassis Lubricant
EO—Engine
Oil
Fig.
36—Lubrication Diagram—Corvette
1.
Front Suspension
2.
Steering Linkage
3. Steering Gear
4.
Air
Cleaner
5. Front Wheel
Bearings
6. Transmission
7. Rear Axle
8.
Oil
Filter
9. Battery
10.
Parking Brake
11.
Brake Master Cylinder
BODY LUBRICATION POINTS (CORVETTE)
Lubricate the following items when possible.
Hood Latch Mechanism and Hinges --Apply light engine oil
to pivot points. Don't oil lock pins or catch plates.
i
Rear Compartment Lid Release and Hinges --Apply light
engine
oil.
Side Door Hinge Pins—Apply light engine oil.
Door Lock Rotor and Striker Plate—Apply light engine oil or
stainless stick lubricant.
Lock Cylinders—Lubricate with powdered graphite.
Window Regulators and Controls and Door Lock Remote
Link —Apply light engine
oil.
Gas Tank Filler Cap Hinge—Apply light engine oil.
Weatherstrips and Rubber Bumpers —Coat lightly with
a
rubber lubricant.
CHEVROLET CHASSIS SERVICE MANUAL
Page 234 of 659
BRAKES
SECTION 5
CONTENTS OF THIS SECTION
Duo Servo Brakes
Disc Brakes
Page
5-1 Power Brakes
5-24 Special Tools
Page
5-31
5-32
DUO-SERVO BRAKES
INDEX
Page
General Description 5-1
Maintenance and Adjustments 5-3
Hydraulic Brake Fluid .. . 5-3
Bleeding Hydraulic System 5-3
Pressure Bleeding 5-3
Manual Bleeding 5_4
Push Rod to Main Cylinder Clearance 5-5
Hydraulic Brake Lines 5-5
Hydraulic Brake Hose 5-5
Hydraulic Brake Tubing 5-6
Brake Adjustment. .................... 5-7
Service Brake 5-7
Parking Brake 5-8
Component Replacement and Repairs 5-9
Parking Brake - Chevrolet, Chevelle and
Camaro 5^9
Pedal Assembly 5-9
Front Cable ,. . . 5-9
Center Cable 5-9
Rear Cables. . 5-9
Parking Brake - Chevy n 5-9
Lever Assembly 5-9
Idler Lever 5-11
Front Cable 5-11
Rear Cable . . ; 5-12
Parking Brake - Corvette 5-13
Lever Assembly . . . . 5-13
Front Cable 5-14
Rear Cable . . 5-14
Brake Pedal 5-15
Shoes and Linings 5-16
Organic 5-16
Metallic 5-17
Main Cylinder 5-18
Wheel Cylinders 5-21
Anchor Pin 5-22
Front Wheel 5-22
Rear Wheel 5-22
Brake Drums • 5-22
Brake Pipe Distribution and Switch Assembly . . . . . 5-23
Camaro Pressure Regulator Valve 5-23
GENERAL DESCRIPTION
All 1967 models are equipped with a new split brake
system as a safety feature. If a wheel cylinder or brake
line should fail at either the front end or rear end of
the vehicle, the operator can still bring the vehicle to
a controlled stop. The system is designed with separate
hydraulic systems for the front and rear brake using
a dual master cylinder (fig. 1). The design of the master
cylinder is similar to that used on the 1966 Corvette
in that it has two entirely separate reservoirs and outlets
in a common body casting. The front reservoir and outlet
is connected to the front wheel brakes, and the rear
reservoir and outlet is connected to the rear wheel
brakes. Two pistons within the master cylinder receive
mechanical pressure from the brake pedal push rod and
transmit it through the brake lines as hydraulic pressure
to the wheel cylinders. The filler cap is accessible from
inside the engine compartment.
A new brake pipe distribution and switch assembly
is mounted below the main cylinder. The front and rear
hydraulic brake lines are routed from the main cylinder,
through the brake pipe distribution and switch assembly,
to the front and rear brakes as shown in Figure 2. The
switch is wired electrically to the brake alarm indicator
light on the instrument panel. In the event of fluid loss
in either the front or rear brake system the indicator
on the instrument panel will illuminate red. (The indi-
cator will also' be illuminated when the parking brake is
applied.)
On Camaro models equipped with air conditioning, the
rear brake hydraulic line is routed through a pressure
regulator valve mounted on the left frame side rail
(fig. 3). The valve controls the hydraulic pressure to
the rear brakes resulting in the correct pressure balance
between the front and rear hydraulic systems.
The self-adjusting brakes (fig. 4), used on both front
and rear of all models, are the Duo-Servo single anchor
type which utilize the momentum of the vehicle to assist
in the brake application. The self-energizing or
self-
actuating force is applied to both brake shoes at each
wheel in both forward and reverse motion. The brake
shoe linings are bonded to the shoes.
Wheel cylinders are the double piston type permitting
even distribution of pressure to each brake shoe. To
keep out dust and moisture, both ejads of each wheel
cylinder are sealed with a rubber booC The wheel
cylinders have no adjustments.
The Chevrolet, Chevelle, and Camaro parking brakes
have a foot operated ratchet type pedal mounted to the
left of the steering column. A cable assembly connects
the pedal to an intermediate cable by means of an equal-
izer, where the adjustment for the parking brake is
incorporated. The intermediate cable attaches to the
CHEVROLET CHASSIS SERVICE MANUAL
Page 236 of 659
BRAKES
5-3
PRIMARY
SHOE
PAWL
WIRE LINK
OVERRIDE
LEVER
VERRIDE
SPRING
RETURN
SPRING
STAR
WHEEL
Fig.
3—Camaro
Pressure
Regulator
Valve
Fig.
4-Self-Adjusting
Brake
MAINTENANCE AND ADJUSTMENTS
In any service operation it is extremely important
that absolute cleanliness be observed. Any foreign matter
in the hydraulic system will tend to clog the lines, ruin
the rubber cups of the main and wheel cylinders and
cause inefficient operation or even failure of the braking
system. Dirt or grease on a brake lining may cause
that brake to grab first on brake application and fade
out on heavy brake application.
The split system consists basically of two separate
brake systems. When a failure is encountered on either,
the other is adequate to stop the vehicle. If one system
is not functioning, it is normal for the brake pedal lash
and pedal effort to substantially increase. This occurs
because of the design of the master cylinder which
incorporates ah actuating piston for each system. When
the rear system loses fluid and takes in air, its piston
will bottom against the front piston. When the front
system loses fluid and takes in air, its piston will
bottom on the end of the main cylinders body. The loss
of fluid in one of the systems causes an uneven hydraulic
pressure balance between the front and rear systems.
The brake pipe distribution and switch assembly, near
the main cylinder, detects the loss of pressure and il-
luminates the brake alarm indicator light on the instru-
ment panel. The pressure loss is felt at the brake pedal
by an apparent lack of brakes for most of the brake
travel and then, when failed chamber is bottomed, the
pedal will harden.
HYDRAULIC BRAKE FLUID
Use GM Hydraulic Brake Fluid, Supreme No. 11 or
equivalent when servicing brakes. This brake fluid is
satisfactory for any climate and has all the qualities
necessary for proper operation, such as a high boiling
point to prevent vapor lock and the ability to remain
fluid at low temperatures.
In the event that improper fluid has entered the system,
it will be necessary to service the system as follows:
1.
Drain the entire system.
2.
Thoroughly flush the system with clean alcohol,
188
proof,
or a hydraulic system cleaning fluid
such as "Declene".
3.
Replace all rubber parts of the system, including
brake hoses.
4.
Refill the system.
5. Bleed the system.
BLEEDING HYDRAULIC SYSTEM
The hydraulic brake system must be bled whenever
any line has been disconnected or air has in some way
entered the system. A ''spongy" pedal feeling when the
brakes are applied may indicate presence of air in the
system. The system must be absolutely free of air at
all times. Bleeding should be done on the longest line
first; the proper sequence to follow is left rear, right
rear, right front, and left front (fig. 5). Bleeding of
brake system may be performed by one of two methods—
either pressure or manual.
PRESSURE
BLEEDING
1.
Clean all dirt from top of main cylinder and remove
cylinder cover and rubber diaphragm.
2.
Reduce fluid level in main cylinder until reservoirs
are approximately half full.
NOTE:
Make sure brake fluid in bleeder equip-
ment is at operating level and that the. equipment
is capable of exerting 30 to 50 lbs. hydraulic
pressure on the brake system.
3.
Install brake bleeder adapter J-22489 (fig. 6) on
main cylinder. Connect hose from bleeder equipment
to bleeder adapter and open release valve on bleeder
equipment.
CHEVROLET CHASSIS SERVICE MANUAL