brake pedal goes to floor after start up - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 2 (permalink) Old 07-04-2017, 07:56 PM Thread Starter
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brake pedal goes to floor after start up

ok...here we go...1995 ford F350 XLT

a couple weeks ago the LF brake cylinder locked up.not enough to stop or pull to hard but it did pull to the left.i was less than a mile to home so got it home parked it and went to work on new front calipers and bled the system.i did not change the front pads as they were new on a front end build that cost to much and the brake pads were wearing fine but they were thin so just replaced the pads.drove absolutely fine until that brake cylinder locked up 6 moths later.after caliper replacement and bleedingthe system my foot goes to the floor.this does not happen while engine is off so i am thinking the brake booster is fine?i got good vacuum at the vacuum pump,adjusted the rear brakes,replaced the MC(yes i bench bled the #### out of it)had les schwab do a full fluid pressure bleed(did not help),gravity bled it for hours,(no better)bled again and again and agin...i see no bubbles whatsoever.and yes i bled the RABSM every time as well and did the screwdriver test on the piston in it also.there is absolutely no leaks of any kind,looked for vacuum leaks EVERYWHERE.what could i be missing??
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post #2 of 2 (permalink) Old 07-05-2017, 12:38 AM
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Re: brake pedal goes to floor after start up

How old is the master cylinder ?


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