Chevrolet 1977 light duty truck, Service Manual

Page: 416 / 861

Fig. 5-32--Pushing Piston in to Bore Using a
"C "
Clamp
2. Raise the front o f the vehicle on a hoist and
remove the fro n t wheels.
3. Push the piston back into its bore. This can be
accomplished by using a " C " clam p as shown in Figure
5-32.
4. R em ove the bolt at the caliper support key.
U sing a brass punch, remove the key and spring (fig.
5-33).
5. Lift the caliper off the disc and support in a
raised position with a heavy wire (fig. 5-34).
C A U T IO N :
Do not support the weight o f the
caliper on the brake hose.
6. Remove the in b o a rd shoe from the steering
Fig. 5-34--Removing Caliper from the Disc
knuckle. Remove and discard the in b o ard shoe clip.
Remove the outboard shoe from the caliper. It m ay be
necessary to tap the shoe to loosen it in the caliper
housing.
C A U TIO N : M a rk disc p a d positions i f pads are
to be reinstalled.
Cleaning and Inspection
NOTE: The shoes should be replaced w hen the
lining is w orn to approxim ately 1/32" thickness
over the rivet heads. Replace shoes in axle sets.
1. E xam ine the inside o f the caliper for evidence
o f fluid leakage. If leakage is noted, the caliper should
be overhauled.
2. W ipe the inside o f the caliper clean, including
the exterior o f the dust boot. Check the boot for cuts,
cracks or other dam age.
C A U TIO N : Do not use compressed air to clean
the inside o f the caliper.
3. Use a wire brush to remove any rust or
corrosion from the machined surfaces o f the steering
knuckle and caliper. It is im p o rta n t to clean those areas
o f the caliper and spindle assembly that are in contact
du rin g the sliding action o f the caliper.
Installation
C A U TIO N :
I f original disc pads are being
reinstalled, they m ust be installed in original
positions (as m arked at removal).
1. Lubricate the caliper and steering knuckle
sliding surfaces and the support spring with Delco
Silicone Lube (or equivalent).
2. Install a N E W in b o ard shoe clip in the steering
INBOARD
SHOE
HEAVY WIRE
OUTBOARD
SHOE
CALIPER
BRASS ROD
SUPPORT
KEY