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BRAKES 5-24
DISC BRAKES
INDEX
Page
General Description .
5-24
Maintenance and Adjustments
5-24
Bleeding Hydraulic System
5-24
Parking Brake Adjustment - Corvette
5-24
Component Replacement and Repairs
5-25
Page
Brake Shoes . . . . .
5-25
Brake Caliper
5-26
Brake Disc
5-29
Main Cylinder.
5-30
Parking Brake Shoes - Corvette
5-30
GENERAL DESCRIPTION
Four wheel disc brakes are standard equipment on
the 1967 Corvette, as in 1966. The Corvette may also
be equipped with heavy duty disc brakes which include
new front calipers, shoes, linings, and rear pressure
regulator valve. This heavy duty option is used in
conjunction with a vacuum power unit. Front wheel disc
brakes are installed as optional equipment on Chevrolet,
Chevelle, Camaro, and Chevy II models.
The disc brake, (fig. 35), consists of a fixed caliper,
rotating disc, splash shield, and mounting bracket. The
caliper assembly contains four pistons and two shoe and
lining assemblies with the lining riveted to the steel
shoes. A seal and dust boot are installed on each piston,
with a piston spring in the caliper cylinder bore beneath
each piston. A retaining pin extends through each caliper
half and both shoes to hold the shoes and linings in posi-
tion in the caliper. On Corvette heavy duty disc brakes,
two retaining cotter pins are used at each end of the
caliper to secure the shoes and linings. Machined sur-
faces within the caliper prevent the shoe and lining
assembly from rotating with the brake disc when pres-
sure is applied.
The disc, which has a series of air vent louvers to
provide cooling, is mounted on the front wheel-hub.
The caliper straddles the disc and mounts on a mounting
bracket attached to the steering knuckle with two bolts.
The Corvette heavy duty option includes a pressure
regulator valve mounted in the rear brake line just
below the main cylinder. Chevrolet, Chevelle, Camaro,
and Chevy n models with disc brakes have a pressure
regulator valve mounted in the front brake line just
below the main cylinder. The valve controls the hydraulic
pressure to the front or rear brakes, as applicable,
resulting, in the correct pressure balance between the
front and rear hydraulic systems. This valve guards
against premature .lock-up of front or rear wheels when
brakes are applied.
Maintenance, adjustment, and service operations which
are not included in this section are the same as for
the Duo-Servo type brakes.
MAINTENANCE AND ADJUSTMENTS
BLEEDING HYDRAULIC SYSTEM
The operation of bleeding the disc brake hydraulic
system is the same as for Duo-Servo system outlined
in the front of this section. Note the exceptions below
and refer to bleeding procedures under Duo-Servo
brakes.
1. When pressure bleeding equipment is used, the
correct pressure setting for bleeding disc brakes
is 10-2.0 lbs. on Corvette, and 40 lbs. on all other
models.
2. The front calipers contain one bleeder valve. The
rear calipers on Corvette contain two bleeder valves
(one inboard and one outboard) which necessitates
the removal of the rear wheels for bleeding.
3. Tapping the caliper with a rawhide mallet as the
fluid is flowing out may assist in obtaining a good
bleeding job.
4. On Chevrolet, Chevelle, Camaro and Chevy II, the
spring loaded end of the pressure regulator valve
(fig. 36) must be held (valve in open position) while
bleeding. This is done by depressing and holding
in the plunger in the end of the valve either by hand,
by taping, or by clamping.
PARKING BRAKE-CORVETTE
Adjustment
1. Raise rear end of vehicle and place on jack stands.
2. Remove rear wheels.
3 / Loosen brake cables at the equalizer until the park-
ing brake levers move freely to the "off" position
with slack in the cables.
4. Turn the disc until the adjusting screw can be seen
through the hole in the disc.
5. Insert an adjusting tool or screw driver through the
hole in the disc and tighten the adjusting screw by
moving your hand away from the floor on both the
left and right sides (fig. 37).
6. Tighten until the disc will not move, then back off
ten (10) notches.
7. Apply the parking brake four (4) notches from inside
the car.
8. Tighten the brake cables at the equalizer to produce
a light drag with the wheels mounted.
9. Fully release the parking brake handle and rotate
the rear wheels. No drag should be evident with the
handle released.
CHEVROLET CHASSIS SERVICE MANUAL
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