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8 Series - E31 (1989 - 1999)

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  #1  
Old 09-20-2012, 05:53 PM
algee608 algee608 is offline
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Location: highland ny
 
Join Date: Sep 2012
Posts: 9
Mein Auto: 635.850,525,530
1991 850 woes

I own a 1991 850. I suddenly noticed a thumping sound near the porer steering reservoir. My mechanic said that it was the power steering pump;so I had it rebuilt and reinstalled after flushing the system. The thumping noise continues until I step on the brake pedal. It stops but if I continue to put pressure on the brake pedal,it sinks down to the floor.I do not want to buya a new master cylinder because it is hit and miss as I already wasted $$$ on a reman p.s. pump.Someone suggested that it could be the accumulator. Anyone have any ideas about this thumping as I feel that it is related to the braking system. Please help any suggestions are welcome.
Many thanks,
Algee 608
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  #2  
Old 09-20-2012, 07:15 PM
AndrewZ's Avatar
AndrewZ AndrewZ is offline
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Location: In Between Dreams
 
Join Date: Feb 2006
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Mein Auto: It has two dipsticks
Welcome! I'll forward your thread to the 8 series forum so someone could help you out.
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  #3  
Old 10-18-2012, 01:37 PM
02540ico 02540ico is offline
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Location: Colorado Springs, Co
 
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Mein Auto: 1997 850Ci
Could be the brake bomb (accumulator), or fluid leaking past the piston in the master cylinder.
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  #4  
Old 10-18-2012, 03:21 PM
algee608 algee608 is offline
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Thanks very much. I will let you know
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  #5  
Old 10-21-2012, 09:30 AM
algee608 algee608 is offline
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Location: highland ny
 
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Mein Auto: 635.850,525,530
bmw 850 parts

As a suggestion,you can rebuild a master brake cylinder or booster through A1 Cardone for one tenth the price of BMW dealers. I also bought an accumulator from Bavarian Autosport for $250. just in case it is not the master or booster. The booster was only $260. and the rebuilt master cost me $1000. through Bavarian. I should have had Cardone do a rebuild. Good luck and be sure to replace your fluid with pentosin.
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