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What is your question?
how do you know if a master cylinder is bad
1 Reply
The best way to tell if a master cylinder is failing is if you hold your foot on the brake and it continues to sink to the floor. This means that fluid is bypassing internally. However, if you have a leak somewhere in the system, that too could be causing the pedal to travel to the floor. So, it's a complete system assessment that will rule a master cylinder as faulty.