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-   -   Braking Problem/Issue HELP! (http://www.bimmerfest.com/forums/showthread.php?t=593094)

BklynTico506 01-10-2012 09:08 AM

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.

JimLev 01-10-2012 09:19 AM

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.

BklynTico506 01-10-2012 09:25 AM

Nope. Its like that regardless of the temp. Cold or warm they still act the same...

BklynTico506 01-10-2012 10:03 AM

Any help guys...?

rdorman 01-10-2012 10:52 AM

Sounds like a booster or a related component. Try a booster test such as this: http://www.classicperform.com/TechBo...tm#testbooster

BklynTico506 01-10-2012 11:09 AM

Quote:

Originally Posted by rdorman (Post 6552892)
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...

bluebee 01-10-2012 12:00 PM

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)

http://www.bimmerfest.com/forums/att...1&d=1325966017

Jase007 01-11-2012 07:04 AM

"BklynTico506"

When was the last time the brake fluid was flushed and system bleed?

cn90 01-11-2012 07:16 AM

Also, check the vacuum hose feeding the brake booster.
A crack in that hose will create the same symptoms you described.

Trebbia 01-12-2012 11:27 AM

Follow that vacuum hose cn90 is suggesting all the way to the sjp to check for cracks up to the manifold.

BklynTico506 01-22-2012 08:42 PM

Quote:

Originally Posted by Trebbia (Post 6557742)
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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