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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 01-10-2012, 09:08 AM
BklynTico506 BklynTico506 is offline
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Mein Auto: 528i
Braking Problem/Issue HELP!

So recently I've noticed that my brake pedal has gotten stiffer, not only that but when I apply pressure I feel the pedal pushing back at me. If I'm at a light with the car in gear I have to press extra hard or the car starts creeping. Not feeling safe at all. I checked the hoses and don't see/hear/feel any leaks. No brake fluid anywhere either.

I want to get this fixed but don't want to deal with the in betweens. I don't know if I should start with the brake booster or as small as the booster check valve. Just looking for someone who may have had this problem previously to give me a good start at fixing it.

ANY IDEAS!?

Thanks for any help.
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  #2  
Old 01-10-2012, 09:19 AM
JimLev JimLev is offline
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Do the brakes work better when the temp has been above freezing for a few days?
If so, water could have got inside the booster and froze.
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  #3  
Old 01-10-2012, 09:25 AM
BklynTico506 BklynTico506 is offline
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Nope. Its like that regardless of the temp. Cold or warm they still act the same...
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  #4  
Old 01-10-2012, 10:03 AM
BklynTico506 BklynTico506 is offline
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Any help guys...?
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  #5  
Old 01-10-2012, 12:00 PM
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bluebee bluebee is offline
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Dunno if it will help, but, the brake pressure sensor is supposed to measure how much pressure your brake pedal is generating.

All you need is a DMM/VOM and a helper.

This should provide enough information for you to test how much pressure is being generated:
- ABS BRAKE DSC trifecta brake pressure sensor diagnostic test DIY (1)

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  #6  
Old 01-10-2012, 10:52 AM
rdorman rdorman is offline
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Sounds like a booster or a related component. Try a booster test such as this: http://www.classicperform.com/TechBo...tm#testbooster
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  #7  
Old 01-10-2012, 11:09 AM
BklynTico506 BklynTico506 is offline
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Quote:
Originally Posted by rdorman View Post
Sounds like a booster or a related component. Try a booster test such as this: http://www.classicperform.com/TechBo...tm#testbooster
Thanks for that. I'll try them out and see what happens. Hoping its just the check valve...
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  #8  
Old 01-11-2012, 07:04 AM
Jase007 Jase007 is offline
Wrenchin' fool ...
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"BklynTico506"

When was the last time the brake fluid was flushed and system bleed?
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  #9  
Old 01-11-2012, 07:16 AM
cn90 cn90 is offline
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Also, check the vacuum hose feeding the brake booster.
A crack in that hose will create the same symptoms you described.
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  #10  
Old 01-12-2012, 11:27 AM
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Trebbia Trebbia is offline
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Follow that vacuum hose cn90 is suggesting all the way to the sjp to check for cracks up to the manifold.
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  #11  
Old 01-22-2012, 08:42 PM
BklynTico506 BklynTico506 is offline
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Quote:
Originally Posted by Trebbia View Post
Follow that vacuum hose cn90 is suggesting all the way to the sjp to check for cracks up to the manifold.

Sorry, I've been out of town and away from the car. The hose is fine. No cracks. I dont know when the last time the system was bled. But I am going to change the Suction Jet Pump that runs along that same hose to the manifold. I'm hoping thats where my issue lies... Let you know what happens when it comes from BMW...
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