Rotor Servicing - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

5-3 6 BRAKES
Do not use emery cloth or any other form of abrasive.
Thoroughly clean the caliper after the use of crocus cloth.
If the bore cannot be cleaned up in this manner, replace the
caliper.
Assembly
1. Lubricate the caliper piston bore and the NEW
piston seal with the clean brake fluid. Position the square
ring seal in the caliper bore groove.
2. Lubricate both sealing lips of the dust boot and the
piston with a light film of clean brake fluid. Place the new
boot over Piston Installer Tool J-24548. This is most easily
accomplished by placing the boot large diameter over the
tool first, then riding the smaller diameter onto the tool. The
large diameter lip must then be slid off the tool to make
ready for installation into the bore groove. Install the boot
(large bead) into the piston bore groove by reaching inside
of Tool J-24548 and pressing the boot bead into the groove
LIG H T T R U C K SER V IC E M ANUAL
(fig. 5-41).
Be sure boot is fully seated in the groove before
proceeding.
3. Place the piston inside of Tool J-24548, force the
piston halfway into the piston bore using a wood hammer
handle or "C" clamp (fig. 5-42); remove Tool J-24548.
Check to be sure the boot was not unseated at piston
installation. Make sure the outer bead of the boot is seated
in the piston outer groove.
Installation
Installation of the caliper and mounting parts is the
same for: "Shoe and Lining-Disc Brake" except for steps
given below:
1. Connect the brake hose to the caliper using NEW
copper gaskets.
Hose must be properly positioned to prevent
NOTICE:
hose twist or misalignment, since hose damage may
result.
2. Bleed the caliper assemblies as outlined earlier in this
section.

ROTOR SERVICING

Checking Lateral Runout
1. Lateral runout is the movement of the rotor from
side to side as it rotates on the steering knuckle spindle. This
could be described as "rotor wobble".
2. The movement of the rotor from side to side in the
lateral plane causes the brake shoe and lining and pistons
to be knocked back into their bores. This results in
additional pedal travel required and a vibration during the
braking action.
3. To check lateral runout, first tighten the wheel
bearings until all of the play is out of the bearings. Fasten
a dial indicator to some portion of the suspension so that
the point of the stylus contacts the rotor face approximately
one inch from the rotor edge (fig. 5-43). Set the dial at zero.
Move the rotor one complete rotation, checking the