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E28 (1982 - 1988)

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  #1  
Old 04-19-2013, 03:32 PM
mhoadbmw85 mhoadbmw85 is offline
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Location: campbell ny
 
Join Date: Oct 2012
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Mein Auto: 85 535i
Exclamation No brake pressure at any wheel.

Well, as i was attempting to replace pads and rotors, I realized that i had a stuck caliper piston so i thought well it pushed in hard. Took off of lift pumped brakes, spongy pedal. So my first thought that caliper is not coming back out its probablly stuck. I replaced the suspect caliper, no fluid form the line? The wheel with no fluid is the RF, So i went to ABS Block cracked the line no fluid. Tried to vacuum bleed no fluid. I belive the master cylinder is bypassing internally? Has anyone had similar issues. I may have ruptured the seal after pushing calipers in. Also a side not i got rid of the ABS block i dont want ABS, No need not a winter driver. If someone has a helpful hint or can comfirm my suspisions let me know please its my daily the winter beater is sold already so if i cant figure out soon im going to have to buy another Bimmer. I love this car so ne help would be awesome also i am a mechanic so i knew to check for external leaks there is none so before this becomes a novel good day fellow fanatics. Durp Durp car is 85 535i hydroboost car.
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  #2  
Old 04-21-2013, 09:57 AM
catso's Avatar
catso catso is offline
catso
Location: Chicago
 
Join Date: Dec 2009
Posts: 2,956
Mein Auto: 2000 323i, 1988 528e
Quote:
Originally Posted by mhoadbmw85 View Post
Well, as i was attempting to replace pads and rotors, I realized that i had a stuck caliper piston so i thought well it pushed in hard. Took off of lift pumped brakes, spongy pedal. So my first thought that caliper is not coming back out its probablly stuck. I replaced the suspect caliper, no fluid form the line? The wheel with no fluid is the RF, So i went to ABS Block cracked the line no fluid. Tried to vacuum bleed no fluid. I belive the master cylinder is bypassing internally? Has anyone had similar issues. I may have ruptured the seal after pushing calipers in. Also a side not i got rid of the ABS block i dont want ABS, No need not a winter driver. If someone has a helpful hint or can comfirm my suspisions let me know please its my daily the winter beater is sold already so if i cant figure out soon im going to have to buy another Bimmer. I love this car so ne help would be awesome also i am a mechanic so i knew to check for external leaks there is none so before this becomes a novel good day fellow fanatics. Durp Durp car is 85 535i hydroboost car.
Either a bad master cylinder, or you still have air trapped in the system. Vacuum bleeding doesn't always work if there is an obstruction or alot of air. Old contaminated fluid can solidify and make proper bleeding impossible, See if you have pressure at the master and work your way out from there.
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  #3  
Old 04-23-2013, 08:24 PM
mhoadbmw85 mhoadbmw85 is offline
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Location: campbell ny
 
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Mein Auto: 85 535i
No brake pressure at any wheel.

Thanks for the help trying to figure out a way to test the pressure, I don't have gauges.


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  #4  
Old 04-24-2013, 12:33 PM
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catso catso is offline
catso
Location: Chicago
 
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Mein Auto: 2000 323i, 1988 528e
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Originally Posted by mhoadbmw85 View Post
Thanks for the help trying to figure out a way to test the pressure, I don't have gauges.


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You should be able to rig something up that would help you confirm that there is pressure from the master. Even if you plug the brake fluid outlets, it will help you determine whether youir problem is in the brake lines or master.
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