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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 09-26-2012, 05:11 PM
audiophool audiophool is offline
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Location: Chestermere AB Canada
 
Join Date: Aug 2012
Posts: 133
Mein Auto: 2008 535xi (LCI)
Sometimes it's hard in the morning...

...brake pedal that is.

Some days it is, some days it isn't. Doesn't seem to matter whether it's left hours, overnight or a couple of days. My Infiniti G37S (ugh) did the same thing. Brakes are fine otherwise. Cause for concern or just meh?
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  #2  
Old 09-27-2012, 04:51 AM
luilui41 luilui41 is online now
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Location: Cape Coral, FL
 
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Mein Auto: 2006 550i
Could "possibly" be the break booster.. My pedal was hard when cold and when going at low low speeds
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  #3  
Old 09-27-2012, 08:23 AM
john@eac john@eac is offline
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Location: Ohio
 
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You could have a vacuum supply issue or even a sticking check valve.
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  #4  
Old 09-27-2012, 03:06 PM
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Bremen Ben Bremen Ben is online now
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Mein Auto: 2008 535i sport
My car does the same thing. Every morning as I put my foot on the brake pedal prior to starting the car, it is stiff; then as soon as the engine is started the pedal "softens" and resumes it's normal motion.
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  #5  
Old 09-28-2012, 06:22 AM
audiophool audiophool is offline
BMWs since '87
Location: Chestermere AB Canada
 
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Mein Auto: 2008 535xi (LCI)
No problem with vacuum supply since it softens up immediately upon the engine starting. Likely a leaky check valve in the booster or regulator/inlet assembly. As long as the assist is working under driving conditions, I'm not going to worry too much about it.
Thanks for the comments.
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  #6  
Old 03-03-2014, 08:19 AM
bob knox bob knox is offline
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Location: Boston
 
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Mein Auto: 08 550 M-Sport
audiophool- Did you ever get this fixed? Anyone know where the check valve is? Is it easy to replace or does the whole booster assembly need to be replaced? My pedal now goes hard the second I turn the car off. All seems normal during driving. Not excited about replacing a $350 vacuum pump, but since everything is fine with the motor running I assume it's not the pump.

Bob
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  #7  
Old 03-03-2014, 08:23 AM
schpenxel schpenxel is offline
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Location: Greensboro, NC
 
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Mein Auto: 2004 545i
I don't see anything specifically called out for it so I'm not sure.. it may be made into the hose that runs from the vacuum pump to the brake booster. I have seen it done that way before

http://www.realoem.com/bmw/showparts...42&hg=34&fg=27

It sounds like something is leaking down over time. I'm not sure why this is even considered an issue though if you don't have any other problems?
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  #8  
Old 03-03-2014, 08:43 AM
bob knox bob knox is offline
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It's not a big issue as long as I'm driving. I parked on a hill yesterday and shut the car off before setting the handbrake. The car rolled a good 5' before I realized what was going on. Brake pedal was rock hard the second after I switched it off. Wasn't ready for that.

My mechanic buddy is looking for a P/N. He thought the valve was stuck inside the vacuum line from the pump. He also was curios about this issue because my car did have the recall work 2.5 years ago. He hasn't seen recall cars fail again.


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  #9  
Old 03-03-2014, 01:26 PM
HPIA4v2 HPIA4v2 is offline
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That recall only affect 550i
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  #10  
Old 03-03-2014, 01:47 PM
H F H F is offline
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Check the brake booster for signs of oil at the connection fitting that leads to the vacume pump. The recall was a new hose that will prevent oil from a bad vacume pump seal leaking into the brake booster , on 545's , and 550's n62's
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Last edited by H F; 03-03-2014 at 01:49 PM.
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  #11  
Old 03-03-2014, 04:50 PM
micosan micosan is offline
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Location: TX
 
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Mein Auto: 550i
Quote:
Originally Posted by bob knox View Post
It's not a big issue as long as I'm driving. I parked on a hill yesterday and shut the car off before setting the handbrake. The car rolled a good 5' before I realized what was going on. Brake pedal was rock hard the second after I switched it off. Wasn't ready for that.

My mechanic buddy is looking for a P/N. He thought the valve was stuck inside the vacuum line from the pump. He also was curios about this issue because my car did have the recall work 2.5 years ago. He hasn't seen recall cars fail again.


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For safety, brake booster system are designed to provide at least two power assist stops should the engine stop running.
My brake booster line recall was performed on 1/2011. Before the recall, brake vacuum held for 1 hour, after the recall vacuum held for 10-12 hours.
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2007 550i Sapphire Black, Prod. Date 11/2006, Sport Pkg, Comfort Access, Navigation, TX, USA

Last edited by micosan; 03-03-2014 at 05:04 PM.
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  #12  
Old 03-08-2014, 09:37 PM
rokdok rokdok is offline
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Location: Tucson
 
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Posts: 34
Mein Auto: 2005 545i
Had the same problem a few years back. Turned out the booster needed to be replaced. BMW did the recall service and said it was good and no signs of oil in the vacuum lines, then within 4 months the booster went out. The old booster was contaminated with oil. Replaced the booster. Flushed the brakes and solved the problem.


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2005 545i - 137k Miles

Work Done (but not written up):
With a lot of help a Professional Mechanic:
- Engine Removal, Teardown, and Installation
- Cylinder Heads Valve Seals / Valve Lapping, Bank 1 - Eccentric Shaft / Intermediate Levers
- Replace Gaskets and Seals, Timing Guides
With a lot of swearing:
- Alternator Bracket Gasket, Brake Booster replacement

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  #13  
Old 04-18-2014, 10:34 AM
bob knox bob knox is offline
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Location: Boston
 
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Mein Auto: 08 550 M-Sport
Looks like a continuing theme of brake booster failure. In the end (after replacing the line and the grommet in the booster myself) it was the booster. My issues started with the hard pedal at start up, then I would randomly loose brake boost just for the last 5-10 feet required to stop, then finally I was losing boost with every stop. Initial bite was always OK, but not the last inch or so of pedal travel, the thing would go rock hard. My 550 is 5 months out of CPO, has 54,000 miles, and I am a good customer. Fortunately BMW did me a solid and split the repair cost. I want to give BMW a little praise for helping me out since most of the time we only dump on them here. No, I am not happy at all that my booster failed in the first place, but at least they stood behind the car when it did.

Finally warming up in NH,
Bob
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