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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 08-15-2014, 07:31 AM
dain dain is offline
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Location: Valdosta, GA
 
Join Date: Aug 2014
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Mein Auto: 2007 550i
All 4 Brakes Locked up

Hey guys...new to the forum.



I have a 2007 550i. I recently had the brakes go out and was told I needed a new master cylinder and brake booster. Those repairs are complete, the car was driven a few blocks and works great. My mechanic parked the car. When he went back to move the car, all 4 brakes were locked. The car is throwing an 5ef0 code ( Hydraulic unit, pressure sensor: plausibility.)

Any ideas? Car is at a local mechanic who was trying to help me out rather than taking it to a dealership. They have already gotten me one time before and I don't trust my dealership.
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  #2  
Old 08-15-2014, 08:04 AM
A B Able Truck's Avatar
A B Able Truck A B Able Truck is offline
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Mein Auto: 2006 550I (N62TU) V8
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Last edited by A B Able Truck; 08-15-2014 at 08:06 AM.
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Old 08-15-2014, 09:33 AM
aber57 aber57 is offline
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Location: Ponder texas
 
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Mein Auto: 2007 550i 6MT
The booster pushrod is too long (I do not believe it is adjustable) or the booster is not fully returning to rest position.
The brake apply switch built into booster is registering no pedal application while the pressure sensors show brake pressure as that is what gives the code you have.

If the nuts holding the master cylinder to booster are unscrewed 1 turn (maybe a little more) the brakes will likely release.

Last edited by aber57; 08-15-2014 at 11:37 AM.
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Old 08-15-2014, 09:43 AM
dain dain is offline
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Location: Valdosta, GA
 
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Mein Auto: 2007 550i
Thanks!!!! We will certainly try that!
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