Brake Master Cylinder - Bypass Condition Test

Brake Master Cylinder - Bypass Condition Test
1. Check the brake hydraulic system for leaks or insufficient brake fluid. Repair as necessary.
2. Observe the brake fluid level in the brake master cylinder reservoir while the brake pedal is slowly applied and released. If the brake fluid level rises when the brake pedal is applied and drops when the brake pedal is released, but the net brake fluid level remains unchanged, the brake master cylinder is bypassing. Repair or install a new brake master cylinder.