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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Sun, Jul-21-2019, 01:38:38 PM   #11
aeronaut
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Default Re: PSA: Check your bolts/nuts frequently

Same thing happened to me a few weeks ago. Rear caliper, front caliper pin, not the bracket bolt (so it was a pretty benign event). I had heard some more-than-usual-noise from the rear, but of course ignored it.

it had probably been a year since I'd had that caliper off. Those caliper pins come with lock-tite type stuff. I have a hard time believing it really helps that much due to the amount of heat.

Safety wire would be the right fix. But that'd be a project.
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Old Sun, Jul-21-2019, 02:55:29 PM   #12
mthreeltw
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Default Re: PSA: Check your bolts/nuts frequently

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Originally Posted by Exclusivs View Post
Where’s the ideal place to Mark?
Or does everyone have preference. I’d think 12oclock?
you just want to mark it where it's the easiest to see - location on the nut/bolt/part isn't important. you simply need to be able to verify the alignment of the marks.
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Old Sun, Jul-21-2019, 02:59:12 PM   #13
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Default Re: PSA: Check your bolts/nuts frequently

i used to also make sure to adjust my nuts, just before cinching my belts, to make sure i'd be comfortable that session or race. equally as important.
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Old Sun, Jul-21-2019, 03:45:14 PM   #14
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Default Re: PSA: Check your bolts/nuts frequently

The fasteners I always visually check before and after an event are the engine/trans/diff mounts. I’ve never marked anything but maybe I should start.

I wouldn’t put a torque wrench on it each time. You will eventually over tighten the fastener. Or you’ll have to loosen and torque every time.

Torque wrench...there’s a technique. One smooth pull or push whenever possible. Not a yank. Not the worst thing ever if you run out of room and have to pull again to get to the spec. Unless it’s a critical or high stress fastener like a rod bolt.


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Old Sun, Jul-21-2019, 07:37:57 PM   #15
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Default Re: PSA: Check your bolts/nuts frequently

Almost happened to me once - now I use loctite and check caliper torque when I check my wheels after the first session.
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Old Sun, Jul-21-2019, 08:23:12 PM   #16
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Default Re: PSA: Check your bolts/nuts frequently

Haven't had the bracket bolt back out, but i have lost a guide pin on the RR caliper before (BW Brass ones). Noticed really bad vibration back there and what felt like "ABS" kicking in constantly. Got lucky for sure. Used some extra muscle to torque them down next time.
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Old Tue, Jul-23-2019, 08:27:47 PM   #17
nholmes
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Default Re: PSA: Check your bolts/nuts frequently

Damn! That could have been much worse for sure.

After every event I typically go over everything with a fine toothed comb. I spend a couple hours under the car inspecting everything. I like to look for leaks, wipe off parts so I can see what sort of state they're in and rock/shake various parts to see if anything is loose.

It's not fool proof, but in the last 10 years I've caught a few things that could have turned into a failure.

The only surprise I've had thus far was the bottom nut on the passenger motor mount had worked loose and abandoned its owner.
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Are you feeling loose in the rear end currently?
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Old Wed, Jul-24-2019, 12:50:24 PM   #18
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Default Re: PSA: Check your bolts/nuts frequently

Yeah it could’ve been worse. I’m lucky to get away with like $105 worth of damage. I think I’m gonna replace both rear calipers and rotors. I’m gonna try to attend another COTA event Aug 31 - Sept 1, so hopefully I can get the car ready by then.
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Old Wed, Jul-24-2019, 05:29:31 PM   #19
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Default Re: PSA: Check your bolts/nuts frequently

I am always working on the brakes, bleeding, annual rotor swapping so tend to tighten periodically anyhow. Paint pen helps me sleep at night and makes it easy to glance under the car during wheel swaps to notice if any bolts have moved.
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Discussing PSA: Check your bolts/nuts frequently in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)