Chevrolet 1980 Light Duty Truck Service Manual page 386

5-32 BRAKES
Fig. 5 -3 8 -S e a tin g Boot
a. The brake hose must be connected to the brake pipe
at the frame or frame bracket.
Use extreme care to orient the hose so that the keyed
hose end fitting aligns with the slot in the bracket without
twisting or kinking the hose.
b. After overhaul — or any time that the brake hose
or line is disconnected -- the calipers must be bled.
Bendix
Removal
Clean dirt from hose to caliper connection before
proceeding with removal.
1. Remove the hose to caliper bolt and cap or tape the
open connections to prevent dirt from entering the hose or
caliper. Discard the copper gaskets.
2. Remove the caliper assembly as described under
"Shoe and Linings-Removal".
D isassem bly (Fig. 5 -3 9 )
1. Clean the exterior of the caliper using clean brake
fluid and place on a clean work surface.
2. Drain the brake fluid from the caliper.
CAU TIO N : Do not place the fingers in
front of the piston in an attempt to catch
or protect it when applying compressed
air.
3. Using clean shop cloths, pad the interior of the
caliper and remove the piston by directing compressed air
into the caliper inlet hole (fig. 5-40).
Use just enough air pressure to ease the
N O TICE:
piston out of the bore. If the piston is seized or cocked
or does not come out readily, release the air pressure
and use a soft (brass) hammer to rap sharply on and
around the end of the piston. Reapply air pressure to
remove the piston.
An alternate method of removing the piston is to stroke
the brake pedal (gently) while the hydraulic lines are still
connected. This will push the piston out of the caliper bore.
Do not blow piston out of the bore as damage to the
piston could occur.
4. Remove the boot from the piston bore.
5. Using a small piece of wood or plastic, remove
the square ring seal from the piston bore.
N O TICE: Do not use a metal tool of any kind for this
operation as it may damage the bore.
6. Remove the bleeder valve from the caliper.
C leaning and Inspection
The dust boot and piston seal are to be replaced
whenever the caliper is overhauled. Discard these parts.
1. Clean all parts (other than those mentioned above
in clean brake fluid. Use dry, filtered, compressor air to
blow out all passages in the caliper and bleeder valve.
LIG H T T R U C K S E R V IC E M AN UAL