18
Section 2
Hydraulic Brakes
Disassemble Wheel Cylinder
WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.
CAUTION
Hydraulic system parts must not contact oil or
grease. Even a small amount of a petroleum
product from dirty hands is enough to damage
the rubber parts.
Figure 2.20.
1. Remove dust boots from the cylinder.
2. Remove the internal parts of the cylinder from
the housing. If necessary, use a wood dowel
driver or apply low pressure compressed air to
the fluid inlet port.
NOTE: Parts which cannot be easily removed
indicate that they are damaged and the cylinder
must be replaced.
3. Clean the cylinder and the parts in the correct
brake fluid for the vehicle. Do NOT use
gasoline or other petroleum products. Use
only lint-free wiping rags.
4. Use a crocus cloth to clean small scratches,
rust, corrosion or discoloration from the
cylinder bore and pistons. Use the crocus
cloth in a circular movement, not a lengthwise
movement. A clean-up hone can be used.
Remove any burrs at the edge of the fluid
intake or bleeder screw ports.
5. After the cylinder is cleaned, check the
clearance of the piston in the cylinder. Replace
cylinder with more than 0.002 inch (0.05 mm)
diameter clearance.
Figure 2.20
TYPICAL WHEEL CYLINDER
BOOT
PUSH ROD
PISTON
CUP
HOUSING
BLEED
SCREW
CUP
SPRING
ASSY.
PISTON
BOOT
PUSH
ROD
