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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 05-23-2013, 12:53 AM
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Mk23 Mk23 is offline
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Firsy DIY brake pad change, 7mm allen bolts issue

So I followed a DIY guide on e90post using the 7mm allen bolts method (little rubber plugs on back of caliper) and I am having an issue with the top bolt not going back into the rubber housing all the way. It will tighten in and feels right when screwing it in and I can even see it going into the correct hole when I look in the side. I took the bolt out many times and made sure it was being stripped (and it isn't) but for some reason it is sticking WAY out and wont allow me to put the little rubber plug back on. The bottom one goes in fine though. I have no idea what is going on here.

Anyone know why this thing wont go back in correctly?
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  #2  
Old 05-23-2013, 06:28 AM
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fun2drive fun2drive is offline
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I would switch bolts and try that. I have never seen this happen on 335's or any BMW for that matter and I have done countless brake pad-rotor changes. A small dab if antiseize is not a bad idea on the threads either. From what I remember last 335 change the Allen bolts are the same length. It either isn't going in far enough or someone replaced it with the incorrect length which sounds far fetched since you had to remove the caps to do the pad install.
I don't have a clue other than these suggestions, never seen an issue like this before...
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Old 05-23-2013, 09:06 AM
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thekurgan thekurgan is offline
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Did you fully torque the lower bolt before attempting the upper bolt?
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Old 05-23-2013, 11:49 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by thekurgan View Post
Did you fully torque the lower bolt before attempting the upper bolt?

Uh oh! Always hand tighten almost snug until all-in. Then torque.
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Old 05-23-2013, 11:55 AM
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thekurgan thekurgan is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Uh oh! Always hand tighten almost snug until all-in. Then torque.
That's what I was thinking, the lower is too tight and the upper can't move around to get the bolt in.
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Old 05-23-2013, 01:32 PM
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Quote:
Originally Posted by thekurgan View Post
That's what I was thinking, the lower is too tight and the upper can't move around to get the bolt in.
I tried taking out both bolts and then doing the top first, still wouldn't go in all the way. They are definitely the same size too. And when tightening it I get to as far as it will go, like there is no more room for it, I don't think it is about rust or anything blocking the threads.

I did notice that the bottom one goes in farther than it did prior to the install and vice versa for the top. I wonder if something is lopsided... Could the piston being compressed lopsided effect the allan bolts? Would it be a good idea to try turning on the car and braking a couple times to uncompress the piston?
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Old 05-23-2013, 01:36 PM
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Orient330iNYC Orient330iNYC is online now
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what happens if you put the original pads back in?
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Old 05-23-2013, 09:35 PM
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Well I found out what was wrong. The bolts are two different sizes for the fronts. I switched them and it worked. Guess I just didn't notice it.

Thanks for the help guys.
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Old 05-24-2013, 05:17 AM
Watchme Watchme is offline
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assuming you're talking about 6 and 7... http://www.realoem.com/bmw/showparts...57&hg=34&fg=05
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Old 06-03-2013, 09:04 PM
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Originally Posted by Watchme View Post
assuming you're talking about 6 and 7... http://www.realoem.com/bmw/showparts...57&hg=34&fg=05
That's correct but on that image number 7 is not right. They basically both looked like number 6 except that one was shorter.
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