Component Replacement And Repair; Brake Shoe And Lining - Chevrolet 10 1971 Series Chassis Service Manual

COMPONENT REPLACEMENT A N D REPAIR
BRAKE SHOE A N D LINING
Front Disc Brake
The brake linings should be inspected any time that the
wheels are removed. Check both ends of the outboard
shoe by looking in at each end of the caliper. This is the
point at which the highest rate of wear normally occurs.
At the same,time, check the lining thickness on the in­
board shoe by looking down through the inspection hole
in the top of the caliper.
Removal (Figs. 15 and 16)
1. Remove main cylinder cover and observe brake
fluid level in front reservoir. If reservoir is more
than 1/3 full, siphon the necessary amount out to
bring the level to 1/3 full.
avoid reservoir overflow when the caliper piston is
pushed back into its bore.) Discard the brake fluid
removed. Never reuse brake fluid.
2. Raise the vehicle and remove the front wheels.
3. Push the piston back into its bore. This can be
accomplished by using a
4. Remove the two mounting bolts which attach the
caliper to the support.
5. Lift the caliper off the disc.
6. Remove the inboard shoe. Dislodge the outboard shoe
and position the caliper on the front suspension arm
so that the brake hose will not support the weight of
the caliper.
7. Remove the shoe support spring from the piston.
8. Remove the two sleeves from the inboard ears of
the caliper.
9. Remove the four rubber bushings from the grooves
in each of the caliper ears.
Cleaning and Inspection
1. Thoroughly clean the holes and the bushing grooves
in the caliper ears and wipe any dirt from the mount­
ing bolts.
Do not use abrasives on the bolts since
NOTE:
this may damage the plating. If the bolts are
damaged or corroded, they should be replaced.
Fig. 15— " C " Clamp For Removal Aid
(This step is taken to
"C"
clamp.
C " C LA M P
OUTER BRAKE S H O E
2. Examine the inside of the caliper for evidence of
fluid leakage. If leakage is noted, the caliper should
be overhauled.
3. Wipe the inside of the caliper clean, including the
exterior of the dust boot. Check the boot for cuts,
cracks or other damage.
Do not use compressed air to clean
NOTE:
the inside of the caliper. This may cause the
dust boot to become unseated.
Installation (Figs. 17 thru 21)
All brake attachments are important at­
NOTE:
taching parts in that they could affect the per­
formance of vital components and systems, and/
or could result in major repair expense. They
must be replaced with parts of the same part
numbers or with equivalent parts if replacement
becomes necessary.
parts of lesser quality or substitute design.
Torque values must be used as specified during
reassembly to assure proper retention of these
parts.
1. Lubricate new sleeves, new rubber bushings, the
bushing grooves and the end of the mounting bolts
using Delco Moraine Silicone Lube or equivalent.
2. Install the new rubber bushings in the caliper ears.
3. Install the new sleeves to the inboard ears of the
caliper.
Position the sleeve so that the end toward
NOTE:
the shoe and lining assembly is flush with the
machined surface of the ear.
Install the shoe support spring and shoe in the center
4.
of the piston cavity.
5. Push down until the shoe lays flat against the caliper.
6. Position the outboard shoe in the caliper with the
ears at the top of the shoe over the caliper ears
and the tab at the bottom of the shoe engaged in the
caliper cutout.
7. With both shoes installed, lift up the caliper and rest
the bottom edge of the outboard lining on the outer
Fig. 16— C aliper Removal and Installation
BRAKES 5-7
Do not use replacement
10-30 CHEVROLET TRUCK SERVICE MANUAL