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E89 Z4 (2009 - current)

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  #1  
Old 12-16-2013, 02:45 PM
docjetski docjetski is offline
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Location: Lebanon, TN
 
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Mein Auto: 2009 Z4 3.0
Replacing rear brakes

I'm trying to replace the rotors and pads on 2009 Z4. Have everything apart but can not compress the caliper piston into the caliper. I even have the proper brake tool for the job. Have tried opening the bleed valve, opening the reservoir cap, pumping brakes, staring car. Nothing works. Any suggestions???
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  #2  
Old 12-17-2013, 12:56 AM
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645/333 645/333 is offline
Michael
Location: uk
 
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If you have the E89 model you cannot replace the rear brake pads without the software to release the worm gear which drives the piston for the handbrake function. Trying to force it back will damage the gears.
There are many very unhappy people who have now realised that you cannot do this as a DIY.
You have to go to a BMW dealer or an Independent who has the software.
I have a set of rear pads and the fixing kit in my garage which I cannot use because of this, they will never be used unless I bought the software myself to code the car........

There is a PDF document on here about the E89 and it explains how the rear brake functions, you will see why you cannot do it, in fact you should get hold of this doc as it explains the roof operation and lots of other things. It was generated by BMW to explain the differences between the E85 and the E89. It is a really good document.......
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Last edited by 645/333; 12-17-2013 at 01:02 AM.
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  #3  
Old 12-17-2013, 05:40 AM
docjetski docjetski is offline
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Thanks

I thought I did my homework on this. Obviously I missed this aspect. It really sucks since Ihave done a lot of work on my own cars over the years. I guess the stealership is going to win this one. I'm going to enjoy dropping a "basket case" on them.
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  #4  
Old 12-17-2013, 02:00 PM
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645/333 645/333 is offline
Michael
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There are people selling a simple coding tool which releases the worm gear, but they are charging £100 for it, so unless you are doing lots of BMW's ie other cars with the electronic parking brake then it is expensive......
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  #5  
Old 12-18-2013, 08:50 PM
docjetski docjetski is offline
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Just a thought. Have not tried this yet. The plug to the electric brake has three terminals. I'm guessing a hot lead, ground and position sensor. What about feeding 12v at low amperage into the unit to activate the motor and retract the piston? Or am I just asking for trouble?
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  #6  
Old 12-18-2013, 09:35 PM
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HerrK HerrK is offline
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Quote:
Originally Posted by docjetski View Post
I'm trying to replace the rotors and pads on 2009 Z4. Have everything apart but can not compress the caliper piston into the caliper. I even have the proper brake tool for the job. Have tried opening the bleed valve, opening the reservoir cap, pumping brakes, staring car. Nothing works. Any suggestions???
You have to screw in/out the piston. See more here.

http://e89.zpost.com/forums/showthre...rear+brake+pad
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  #7  
Old 12-21-2013, 10:49 AM
docjetski docjetski is offline
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It worked!

HerrK.

I followed the instructions on the link and was able to install new rotors and pads with no difficulty. I was able to reset the wear sensor computer as follows. With the car running and in park, I held down the the trip reset button until the display changed to the maintenence information. You can use the toggle switch on the turn indicator lever to switch between the different items. When I got to the rear brakes, I held down the push button at the end of the turn indicator lever until a small clock appeared in the display. I then released the button. After about 30 seconds the display reset itself to 31,000 miles.

Again, thanks to everyone for the help.
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  #8  
Old 12-21-2013, 11:07 AM
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645/333 645/333 is offline
Michael
Location: uk
 
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Given all my comments about not being able to do it without the software, I am really pleased you have been able to complete the task, well done to HerrK for finding the thread as well. It is always pleasing when enterprising people do not accept the status quo and are prepared to challenge, then willing to share their knowledge and experience.....
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