Master Cylinder Disassembly

Exploded View Of Master Cylinder Assembly:

DISASSEMBLY
1. Remove master cylinder from vehicle.
2. Remove reservoir cover and diaphragm. Discard old brake fluid in reservoir.
3. Inspect cover and diaphragm. Replace if cut, cracked or deformed.
4. Remove failure warning switch and proportioners, if equipped.


Failure Warning Switch

Failure Warning Switch:

- Remove electrical lead.
- Remove failure warning switch.
- Remove 0-ring (OEM switch may not include 0-ring).

Proportioner Valve Assemblies

Proportioner Valve Assemblies:

- Remove proportioner valve assemblies.
- Remove 0-rings.
5. Depress primary piston and remove lock ring.
6. Plug primary fluid outlet (outlet nearest to cowl when master cylinder is installed), then apply compressed air into secondary fluid outlet to remove primary and secondary pistons.
7. Remove spring retainer and seals from secondary piston.
8. Remove switch piston assembly.

Switch Piston Assembly

Switch Piston Assembly:

- Remove failure warning switch (if not previously removed).
- Remove allen head plug and 0-ring.
- Remove switch piston using needle nose pliers.

Removing Master Cylinder Reservoir:

9. Clamp master cylinder in a vise, then remove reservoir using a pry bar. Remove reservoir grommets.

CAUTIONS:
- Do not clamp on master cylinder body, instead clamp on mounting flange. - Do not remove quick take-up valve from body. The valve is not serviceable separately.
10. Inspect master cylinder bore for corrosion.

NOTE: Do not use abrasive material on master cylinder bore.Replace if bore is corroded.