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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 02-28-2015, 03:39 PM
jxo jxo is offline
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Location: New York, NY
 
Join Date: Mar 2010
Posts: 71
Mein Auto: 2000 528i
Frozen Brake Booster; Time to Replace?

A few weeks ago, my 2000 528i had a frozen solid break pedal. In 15 degree weather, with the engine left on for about 15 minutes, the pedal loosened up. I carefully drove in the neighborhood and the brakes worked fine. The pedal/booster froze up again today. Same result, the booster thawed after about 15 minutes. The brakes were fine, not mushy. I don't sense that the booster is full of water.

I am assuming I got some water in the booster due to a clogged drain but it is hard to tell how much.

I assume the booster should be replaced (probably with the MC).

Any contrary thoughts? Any safe way to determine whether the booster is safe to keep? Once it warms up a bit, I will make sure the cabin area is cleared of debris and the drain is working.
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  #2  
Old 02-28-2015, 03:54 PM
JimLev JimLev is offline
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Location: MA
 
Join Date: Dec 2003
Posts: 4,099
Mein Auto: 540/6, S60 Volvo, Tribeca
The inside could be rusted depending on how long it has had water in it.
Might be wise to replace it. The MC should be OK.
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2000 540/6 Slightly tweeked...everywhere
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  #3  
Old 02-28-2015, 04:12 PM
HTK12 HTK12 is online now
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Location: Finland
 
Join Date: Aug 2012
Posts: 1,154
Mein Auto: E39 540i
As JimLev said, it could be rusted. If it is I would replace the booster. I see no reason to replace the MC.
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  #4  
Old 02-28-2015, 04:46 PM
pshovest pshovest is online now
BMW CCA 69606
Location: DE
 
Join Date: Dec 2009
Posts: 830
Mein Auto: '10 535iA, '00 528iTM
Mine froze ~5 years ago. I dried it out by letting it thaw and blowing compressed air to bottom of booster thru a 1/4"OD poly tubing thru the vacuum connection. It's been working fine ever since. Not sure what to do with the booster I bought on ebay.
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