Brake Master Cylinder

 CAUTION: Blistering or swelling indicates contamination of brake fluid by a petroleum-based solvent or oil. In that case, all rubber components in the brake hydraulic system must be inspected and replaced and the entire system must be flushed with clean brake fluid to prevent recontamination. Replace the following components:

• Brake master cylinder fluid control valve (2C161)
• Front brake caliper seals
• Rubber front brake hoses
• Rubber rear brake hoses
• Brake pressure control valves (2B091)
• Primary and secondary piston assemblies
• Master cylinder reservoir seal kits (2L074)
• Brake master cylinder filler cap (2162)

1. Wash brake master cylinder (2140) body, especially bore, along with primary and secondary piston assemblies in clean brake fluid. Denatured or isopropyl alcohol can be used instead.

2. Inspect seals on primary and secondary piston assemblies for cuts, nicks, scratches, or signs of wear and for presence of any blistering or swelling.

   NOTE: The aluminum body of the brake master cylinder is anodized. Some signs of bore wear on the anodized surface, as evidenced by lighter areas of the anodized surface, are normal and not detrimental.

    CAUTION: Honing of the bore on aluminum brake master cylinders is not permitted as the anodic coating and hardness could be removed.

3. Inspect brake master cylinder bore for pitting, corrosion, or heavy wear. Heavy wear is characterized by scoring or galling of metal.