1999 ford e-150
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Joined: Nov 2006
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1999 ford e-150
We have a conversion van with ABS brakes. While returning from Georgia this week, The brake pedal started going to the floor although it never did go all the way, and the ABS light came on. Today I replaced the master cylinder and I bled the thing on my bench. After installing it I noticed that without the motor running the pedal is full and hard, but as soon as I start the engine it goes soft and goes to the floor. The ABS light is still on too. Has anyone else had this problem? if so please let me know how it was resolved.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
You have a broken brake line at the rear of the vehicle. The REAR brakes are what determines how the brakes feel. You need to get under it and look at all the lines from the proportioning valve back. It could even be a bad wheel cylinder (if you have drum brakes) or a bad caliper (if you have rear discs). My' 91 merc does this same thing, no abs though. It's just air in the lines.. I'm too lazy to bleed it right now as the brakes work fine other than the squishy pedal.
Lead Driver
Joined: May 2004
Posts: 5,037
Likes: 137
From: Maryville
I found bleeding an ABS vehicle is difficult, they eleminate the brakes from locking by limiting the pressure, so they do similar bleeding, making it difficult, I'd like a vacuum tool to bleed them.
