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Abs pump ??? Abs pump ???
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E34 M5 Discussion 1988-1995 Sedan and Touring


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Old 20th August 2011, 06:22   #1
Blitzkrieg Bob
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Abs pump ???
the past few weekends I have been rebuilding the front suspension and brakes... Only to find the pedal spongy after new rotors and pads... So, I do the obvious and replace the master and bleed the system.... Still spongy!!! Under full force the pedal creeps as if there is a leak or failed master, could it be the ABS pump?
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Last edited by Blitzkrieg Bob; 20th August 2011 at 06:23.
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Old 20th August 2011, 07:58   #2
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Sounds like air? I would think that the ABS pump would only do something if it detects slip... But I don't know.
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Old 20th August 2011, 10:12   #3
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I would be looking for air in the system / failed hoses initially Bob ............

Do you still have the original rubber brake hoses fitted ?

D
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Old 20th August 2011, 18:47   #4
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Thanks guys,

Yeah air was my first thought too, that's why I bleed it twice, checked all the lines and watched the reservoir fluid level to see if it was going down.

Dave, yes I have the original lines...Could they give/expand that much?
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Old 20th August 2011, 19:32   #5
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Those can expand, but I've also heard that as the rubber gets older, they can disintegrate and a little rubber flap can hang down and cause a blockage in flow in 1 direction. Who knows though.
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Old 20th August 2011, 19:45   #6
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Quote:
Originally Posted by intense1 View Post
Those can expand, but I've also heard that as the rubber gets older, they can disintegrate and a little rubber flap can hang down and cause a blockage in flow in 1 direction. Who knows though.
Yeah, I have seen the flap/blockage thing on a friend's e34. That showed up as a dead caliper.

I have good flow to each caliper, but the pedal just doesn't feel right
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Old 20th August 2011, 22:41   #7
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Bleed it again! I had to bleed my e46 like 5 times. Had a bubble somewhere.
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Old 23rd August 2011, 00:04   #8
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I am thouroghly convinced that the new master cylinder is faulty... After bleeding it at the line fittings on the ABS pump and then at each caliper twice .... No improvement
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Old 23rd August 2011, 00:13   #9
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Sounds probable !

D
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Old 23rd August 2011, 04:43   #10
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I've had them be faulty out of the box. Was it a rebuild?
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