1. Crossover seal
2. Wooden toothpick
3. Wiper
4. Square seal
Figure 2-70.Wipers and Seals
CLEANING, INSPECTION AND REPAIR
Use denatured alcohol to clean brake system components.
Do not use mineral-based solvents (such as gasoline or
paint thinner), which will deteriorate rubber parts even
after assembly. Deterioration of these components can
cause brake failure, which could result in death or serious
injury. (00291a)
Compressed air can pierce the skin and flying debris from
compressed air could cause serious eye injury. Wear
safety glasses when working with compressed air. Never
use your hand to check for air leaks or to determine air
flow rates. (00061a)
1. Clean all parts with denatured alcohol or D.O.T. 4 BRAKE
FLUID. Do not contaminate with mineral oil or other
solvents. Wipe parts dry with a clean, lint free cloth. Blow
out drilled passages and bore with a clean air supply. Do
not use a wire or similar instrument to clean drilled pas-
sages.
2. Carefully inspect all components. Replace any parts that
appear damaged or worn.
a. Check pistons for pitting, scratches or corrosion on
face and also on ground surfaces.
b. Inspect caliper piston bore. Do not hone bore. If bore
should show pitting or corrosion, replace caliper.
c. Inspect pad pin for grooving and wear. Measure the
pad pin diameter in an unworn area, and then in the
area of any grooving or wear. If wear is more than
0.015 in. (0.38 mm), replace both pins.
d. Always replace wipers, square seals and crossover
seal after disassembly.
2-38 2008 Dyna Service: Chassis
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