Checking Rotor Condition
Before removing the rotor from the vehicle, check it
for damage, warping, and proper thickness. Normal rotor
wear patterns consist of small scratches and a slight pol-
ishing of the braking surfaces. They do not greatly affect
braking and can usually be removed by light sanding
instead of machining.
Chapter 13 Disc Brake Service 219
Figure 13-21. A—Installing new brake pads on ball and ramp calipers requires the piston be screwed back into its bore. A special
tool is needed for this procedure. Position the tool and rotate the handle counterclockwise while holding the shaft. Continue until the
tool is seated against the piston. Loosen the tool handle about one-quarter of a turn. Now hold the tool handle and turn the shaft t
until the piston is completely bottomed. Even though the inward travel of the piston has stopped, it will continue to rotate after bot-
toming. B—Make sure the tabs on the pad are installed in the alignment notches in the piston. (Wagner)
Caliper
Drive
axle
pecial Sp
tool
Wrench
Turn this direction
to seat tool
against piston
Check
valve
Cone
Boot
Alignment notch
Rot ta te clockwise
to bottom b piston
Figure 13-22. Retracting the piston by turning in a clockwise
direction with a special locknut wrench. This will provide the
necessary clearance for installing the new brake pads. (Honda)
Extension
bar
Locknut
wrench
Piston
boot
Pistononst Pi
Caliper i
Figure 13-23. After installation, the rear caliper piston must be
adjusted so the pads rest just against the rotor.This is a special
adjustment procedure that can be used to adjust rear brake
calipers. (Chevrolet)
Screwdriverrveirdwe
Screwdriver
Boot B
roove gr
Boot
Shim
Rotor
Lining
Piston
Pad
A
B
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