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Does anyone know the torque specs for the bolts with a front brake caliper?
Dear everyone
hello. Now I’m planning to change the front brake pad. So there is the bolt through the front caliper also l have to loose the bolt and have to atach the bolt after pad change.
So I’d like to know the torque specs of the bolt.
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Originally Posted by ItalianJoe1
Sure they do, number 35 in this doc, 180 Nm, use a new bolt every time (locking compound on threads)
Yup, one time use and 135ft/lbs. I checked mine just before the start of the season. The calipers had been on and off a few times and I forgot to use new bolts. None were loose, but they definitely weren’t near 135. You’d have a real bad day if one of those let go (google it). I threw in the new spare bolts that I had and ordered another bag of new bolts (8). They have sealant already on the threads. They do not come with integrated washers like the OEM bolts and I thought that was strange.
Sure they do, number 35 in this doc, 180 Nm, use a new bolt every time (locking compound on threads)
Thanks, Joe.
Number 35 in that PDF appears to be of the 2 bolts attaching the Caliper Bracket to the Knuckle, no?
Jasonoff (and myself) are wondering what the Torque specs are for the 2 Allen/Hex bolts that attach Front Caliper to Caliper Bracket?
Sure they do, number 35 in this doc, 180 Nm, use a new bolt every time (locking compound on threads)
It's for sure not that bolt. That's the retainer to knuckle bolt which is much larger. The one I'm talking about looks like the below that can't handle anything close to 130ft-lbs.
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Originally Posted by Jasonoff
It's for sure not that bolt. That's the retainer to knuckle bolt which is much larger. The one I'm talking about looks like the below that can't handle anything close to 130ft-lbs.
THIS bolt you posted. Right above there. The silver one. They are ALL at 135ft/lbs on my car. No problems.
THIS bolt you posted. Right above there. The silver one. They are ALL at 135ft/lbs on my car. No problems.
Ok if you say so. The bolt that threads into the knuckle is M14 and the caliper to retainer bolt is much smaller (M8 maybe?). Please don't tell people to over-torque an M8 bolt.
If you torqued that M8 to 135ft/lbs I would go replace them ASAP.
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Originally Posted by Jasonoff
Ok if you say so. The bolt that threads into the knuckle is M14 and the caliper to retainer bolt is much smaller (M8 maybe?). Please don't tell people to over-torque an M8 bolt.
If you torqued that M8 to 135ft/lbs I would go replace them ASAP.
Wonderful. What grade is this bolt exactly. Didn’t we discuss this in the other thread. Where I was told by two different people that it was 135ftlbs? Sigh. Good thing I have 8 new ones..... (I still think they should be tighter than 85ftlbs)
I broke one of those caliper to caliper bracket bolts by trying to torque to 130fl/lbs. Was a nightmare getting the broken piece out of the bracket. I then replaced all 4 bolts and the ones that didn't snap (I never did get them to 130ft/lbs) were visually stretched and on the verge of snapping as well.
I couldn't find the torque spec for that bolt anywhere in the WIS so I just matched the Stoptech ST40 install instructions for a similar bolt which was 40 ft-lbs.
It's been years since I had mine apart. Maybe it's an M10? You can likely assume 10.9 since it's a brake component.
What about the SLS AMG brake? They bolt directly to the knuckle without a bracket and by the looks of it you need to remove the socket head cap screw every time to change pads on the front carbon ceramics and on both steel and carbon ceramics.
The a0039907905 bolt is used by the SLS AMG as well. Maybe we can compare the bolt specs.
06-05-2018, 09:56 PM
