brake pedal slowly goes to the floor - Ford Powerstroke Diesel Forum
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  #1  
Old 09-02-2007, 09:51 AM
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brake pedal slowly goes to the floor

my 95 has been sitting for about 3 months. Took it out the other day and all was well. Changed the serp belt and put the emergency brake on. Went out the next day and i noticed in drive you push the brake normally and if you push it a little harder it will go to the floor? i tried it on the road and it brakes but still goes to the floor and doesen't seem to brake as hard as it did. I checked with it running an the vac pump makes vacuum. Stuck to my finger and was hard to pull off. I noticed when it revved the engine it stayed pretty much the same.

No abs light on
doesn't leak fluid
master is full
vac pump seems to be working ok.



i thought maybe i routed the belt wrong and was spinning the vac pump the wrong way. Double checked the routing and its ok.

Any ideas?
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Old 09-02-2007, 10:03 AM
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I am new to this site and an "old school" guy, but it sounds to me like the master cylinder is bypassing; meaning that it can be completely full but the o-rings etc. are not holding the pressure on the fluid as you press the pedal, the fluid bypasses around the rings and goes back to where it came from in the master cylinder. It's kinda' like plunging a commode, but the plunger won't get a good seal or has a hole in it! Hope this helps! Others will probably chime in with other help.
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Old 09-02-2007, 10:38 AM
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thanks

seems that letting a vehicle sit outside is the worst thing for it.
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Old 09-02-2007, 10:41 AM
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Hey Squirt Can post up in the Introductions part of the forum, so we can properly greet you
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Old 09-02-2007, 12:46 PM
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Hey Squirt Can,
I had the same problem a while back. I ended up having to replace my RABS unit. It is located on the drivers side frame rail below the drivers feet IIRC. The new unit helped for a while but I have noticed that it is acting up here lately. Hope this helps.
Craig
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Old 09-02-2007, 05:11 PM
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any way of testing the master cyl or this rabs unit? or is it just change and pray lol
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Old 09-02-2007, 05:20 PM
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Someone more knowledgeable will have to answer that one.
Craig
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