Posts Tagged: brake pedal goes to floor
Why Your Brake Pedal Goes to the Floor and How to Fix It
Common Reasons a Brake Pedal Goes to the Floor and How To Fix It Quick Summary When the brake pedal goes to the floor, it is never something to ignore. In my experience, the most common causes are low brake fluid, air in the brake lines, an external hydraulic leak, a failing master cylinder, a stuck open ABS valve, or rear drum brakes that are badly out of adjustment. In some cases, a pedal that sinks slightly only when the engine is running can also indicate normal power assist. Why … Read More
Test master cylinder
How to test a master cylinder When you apply the brakes and the pedal goes to the floor, most mechanics and DIYers automatically assume they’re dealing with a bad master cylinder (MC). But unless you actually test it, you’re just guessing, because some ABS components can mimic the feel of a bad MC. A stuck open ABS valve to an ABS accumulator can allow brake fluid to flow out of the MC and fill the accumulator. That would feel exactly like a bad MC. Test master cylinder So the only … Read More