Abs pump ??? - BMW M5 Forum and M6 Forums
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post #1 of 12 Old 20th August 2011, 06:22 AM Thread Starter
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?

1990 525 Alpine Weiss, Miller MAF conversion, Eibach springs, and Dinan cigarette lighter.

1991 M5 Sterling Silber with TMS chip, SLS delete, UUC SSK & DSSR, M Tech EVO II Wheel, Eibach springs, RD Bilstein struts and Stebro exhaust.

1991 M5 Alpine Wiess slowly coming together with a rebuilt MAF, M pars and a B&B exhaust

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post #2 of 12 Old 20th August 2011, 07:58 AM
intense1
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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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post #3 of 12 Old 20th August 2011, 10:12 AM
davidoli
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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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post #4 of 12 Old 20th August 2011, 06:47 PM Thread Starter
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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?

1990 525 Alpine Weiss, Miller MAF conversion, Eibach springs, and Dinan cigarette lighter.

1991 M5 Sterling Silber with TMS chip, SLS delete, UUC SSK & DSSR, M Tech EVO II Wheel, Eibach springs, RD Bilstein struts and Stebro exhaust.

1991 M5 Alpine Wiess slowly coming together with a rebuilt MAF, M pars and a B&B exhaust
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post #5 of 12 Old 20th August 2011, 07:32 PM
intense1
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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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post #6 of 12 Old 20th August 2011, 07:45 PM Thread Starter
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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

1990 525 Alpine Weiss, Miller MAF conversion, Eibach springs, and Dinan cigarette lighter.

1991 M5 Sterling Silber with TMS chip, SLS delete, UUC SSK & DSSR, M Tech EVO II Wheel, Eibach springs, RD Bilstein struts and Stebro exhaust.

1991 M5 Alpine Wiess slowly coming together with a rebuilt MAF, M pars and a B&B exhaust
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post #7 of 12 Old 20th August 2011, 10:41 PM
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post #8 of 12 Old 23rd August 2011, 12:04 AM Thread Starter
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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

1990 525 Alpine Weiss, Miller MAF conversion, Eibach springs, and Dinan cigarette lighter.

1991 M5 Sterling Silber with TMS chip, SLS delete, UUC SSK & DSSR, M Tech EVO II Wheel, Eibach springs, RD Bilstein struts and Stebro exhaust.

1991 M5 Alpine Wiess slowly coming together with a rebuilt MAF, M pars and a B&B exhaust
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post #9 of 12 Old 23rd August 2011, 12:13 AM
davidoli
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Sounds probable !

D

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post #10 of 12 Old 23rd August 2011, 04:43 AM
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