ABS brake pedal slowly goes to the floor

TG2016

MEMBER
1999 DODGE DURANGO
5.9L
V8
4WD
AUTOMATIC
149,000 MILES

Some time ago my ABS pump would not stop running after I turn my vehicle off and my check engine light, brake light, and ABS light was on. I pulled the fuse to the ABS motor and drove like that for two years. Now the brake pedal slowly goes almost to the floor when brakes are applied. A new master cylinder was installed yesterday, but the brake pedal still slowly goes to the floor. I can stop the car with mild pumping action. There are no leaks in the brake system. I was told there's a problem with the ABS system. Do you think it is the small aluminum part that feeds the ABS motor housing or is fluid getting by past something in the ABS motor housing? When I go to get another control module, do I need some information from the old unit to match it up?

3 Replies

HMAC300

MECHANIC
48,601 POSTS

No long as you have fluid in master. There is probably air in ABS uni.T a mechanic will have to use his scanner to open the valves on ABS unit to bleed system and that should take care of it.

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Thursday, April 20th, 2017 AT 12:36 PM

TG2016

MEMBER
2 POSTS

Thanks for your reply. Okay, I will find someone with a scanner. The thing is though, the soft pedal just started two days ago, before the master cylinder was replaced. The shop I took it to thought the problem was the master cylinder, but it was not. I do not know if they used a scanner on the SUV. And yes, the fluid level in the master cylinder is full and the level has not changed.

The ABS module will need to be replaced though, right? I am referring to the electrical part on top. Is there some type of matching required for that part? My search for those parts appears only through a dealer or junk yard. I saw some on eBay, which are probably from a junk yard.