01-19-2020, 07:10 PM | #1 |
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Need to replace rear brake pad carrier bolts?
I've looked up part # for rear brake pad carrier bolts (34-20-6-850-536), it is a M12 x 1.5, 32mm. Was wondering if anyone knows if these are supposed to be replaced after removal?
The torque spec of 30Nm + additional 90 degrees turn makes me think these are one time use "stretch" bolts, but not sure. Can anyone chime in? Thanks, Bryan |
01-19-2020, 07:27 PM | #2 |
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Page 22 of this .pdf suggests that they need to be replaced. http://f30.bimmerpost.com/forums/att...6&d=1476916748
I think they are under $5 each, probably wise to just buy new ones and toss the old. If anyone knows for sure, would still like to hear from you. |
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01-19-2020, 07:56 PM | #3 |
Colonel
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This isn't a project I've had to do on the F30 or F22 yet, but on the 2002s, E28s, E30, E39 & E46s I've not replaced the bolts. Maybe use some blue threadlocker.
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01-19-2020, 11:51 PM | #4 |
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Definitely a stretch bolt that should be replaced. The TIS specifies 50Nm +60 degrees for the 228i rear caliper carrier here: https://www.newtis.info/tisv2/a/en/f...rakes/GfyH0Hrd that would likely be close to 30Nm +90 degrees, though.
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bthomas51863.00 dradernh4818.00 |
01-23-2020, 10:25 AM | #6 | |
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Quote:
Oddly, the bolt is listed as a Torx while a hex is shown in the parts image:
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01-23-2020, 11:30 AM | #7 | |
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Quote:
M12x1.5 at 110Nm for a 10.9 or 12.9 bolt is below it’s plastic range, so strain in the bolt shouldn’t be an issue for reuse. The picture in realoem showing a hex bolt may just be a generic image, the descriptions are usually more accurate. |
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dradernh4818.00 bthomas51863.00 |
04-13-2024, 04:42 PM | #8 |
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Doing rear brakes now, called dealer for bolt replacement and they reuse them unless seriously corroded....and the torque is "pad carrier to knuckle" torque. It was a bitch to remove, definitely not 22 ft-lbs, these are the 110Nm/81 ft-lb bolts.
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