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break petal sinks to floor - but car stops

Posted: Tue Aug 13, 2019 11:13 am
by Jordanl17
I've had a long term issue with my breaks on my 2008 Mercury Sable Premier (150k). sometimes the break pedal goes almost all the way down to the floor, but the car does stop.. this can be recreated if you very gently press the pedal, then, with the same gentile pressure you can press all the way down. BUT if you are kind of hard on the breaks it will catch at the top of the pedal every time.
I had the car at the mechanic for a few weeks while he troubleshot it. I told him must be the master cylinder (I even bought one!), he said he installed it. still does the break sink. he never figured it out.
To this day, it still happens! what are all the possible causes for the break sinking to the floor (but only if you are soft on the breaks). thanks guys!