Wheel Cylinders
NOTE:
You are not required to replace or rebuild wheel cylinders in axle sets. However, when rebuilding or replacing a wheel cylinder due to the conditions that follow, you may suggest rebuilding or replacement of the other wheel cylinder (on the same axle) for preventive maintenance, for example, the part is close to the end of its useful life. Determine the need to rebuild or replace based upon the individual wheel cylinder conditions.
| Condition | Code | Procedure |
|---|---|---|
| Attaching hardware bent | B | Require replacement of bent parts |
| Attaching hardware broken | A | Require repair or replacement of hardware |
| Attaching hardware corroded, affecting structural integrity | A | Require replacement of corroded parts |
| Attaching hardware loose | A | Require repair or replacement |
| Attaching hardware missing | C | Require replacement of hardware |
| Attaching hardware not functioning | A | Require repair or replacement of hardware |
| Bleeder port damaged (if non-repairable) | A | Require replacement |
| Bleeder screw broken off in wheel cylinder (if non-repairable) | A | Require replacement |
|
NOTE:
Only required if the hydraulic system must be opened.
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| Bleeder screw plugged | A | Require repair or replacement |
|
NOTE:
Only required if the hydraulic system must be opened.
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| Bleeder screw seized | A | Require replacement |
|
NOTE:
Seized is defined as bleeder screw that cannot be removed after a practical attempt at removing. Only required if the hydraulic system must be opened.
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| Bore corroded (pitted) | B | Require replacement |
| Bore grooved | A | Require replacement |
| Bore oversized | B | Require replacement |
| Dust boot missing | C | Require replacement of dust boot |
| Dust boot torn | A | Require replacement of dust boot |
| Leaking | A | Require rebuilding or replacement |
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NOTE:
Leaking is defined as a drop or more. Dampness is normal.
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| Loose | B | Require repair or replacement |
| Piston corroded, affecting performance | B | Require replacement of piston and rebuilding or replacement of wheel cylinder |
| Piston finish worn off | B | Require replacement of piston and rebuilding or replacement of wheel cylinder |
| Piston stuck in bore | A | Require replacement of wheel cylinder |
| Threads damaged | A | Require repair or replacement |
| Threads stripped (threads missing) | A | Require replacement |