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Part number for caliper mounting bolts to knuckle?

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Part number for caliper mounting bolts to knuckle?

 
Old 04-20-2018, 05:19 PM
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Part number for caliper mounting bolts to knuckle?

These things really shouldnít be reused and Iím a little nervous getting the car ready for track season as Iíve had the calipers on and off a number of times in the past couple years. Have read some horror stories about these fatiguing and letting go, catastrophically. Was just about to do it again tonight to put in new rear studs and didnít have any spares. Canít find the part numbers anywhere. Thx

Also Iím seeing torque spec of 135ft/lbs which seems pretty aggressive. I think mine are on there now at 85.
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Old 04-20-2018, 07:28 PM
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Yeah, I'm curious as well. When I did my front brakes, 135 ft-lbs seemed really high. It feels like you are going to break them. I would have liked to have replaced them.
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Old 04-20-2018, 08:00 PM
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Old 04-20-2018, 08:32 PM
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Originally Posted by Jasonoff View Post
Awesome thanks
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Old 04-21-2018, 04:58 PM
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This is what I found for torque.

Self locking bolt brake caliper to steering knuckle M14 180NM. Converts to 132.76 ft-lb so 135 ft-lb works.

Source: Alldatadiy.
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Old 04-21-2018, 05:08 PM
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Originally Posted by Mort View Post
This is what I found for torque.

Self locking bolt brake caliper to steering knuckle M14 180NM. Converts to 132.76 ft-lb so 135 ft-lb works.

Source: Alldatadiy.
Yup that was a rough conversion thx. Also learned that the bolts are not exactly TTY, however they do stretch by design (ďself lockingĒ). This is why they should not be reused.
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Old 06-06-2018, 04:03 AM
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it like he stole it.
Originally Posted by Jasonoff View Post
Thank you
Is the Rear Caliper to Knuckle Bolt (A0189900001) the same as the Front Caliper Bracket to Knuckle Bolt?
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Old 06-06-2018, 04:21 AM
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*Front bolts should be (M14x32), with # "001 990 08 14"

*Rear bolts should be (M12x35), with # "018 990 00 01"

-;ZAYED;-
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Old 06-06-2018, 08:45 AM
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Originally Posted by MBNRG View Post
Thank you
Is the Rear Caliper to Knuckle Bolt (A0189900001) the same as the Front Caliper Bracket to Knuckle Bolt?
Yeah my bad, didn't notice it said rear.

A 001 990 08 14 was the same part# I found in the WIS for front retainer to knuckle bolt.
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Old 06-06-2018, 03:47 PM
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My thread title is wrong. I meant caliper to adapter bolt. And torque. Got the bolts. Still don’t have a good answer to the torque spec.

In the rear there there is no adapter if I remember correctly. Caliper bolts directly to the knuckle. Does anyone have the bolt part numbers and torque specs for those too? Just going to re-do all of them.
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Old 06-06-2018, 04:07 PM
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it like he stole it.
Originally Posted by BLKROKT View Post
My thread title is wrong. I meant caliper to adapter bolt. And torque. Got the bolts. Still donít have a good answer to the torque spec.

In the rear there there is no adapter if I remember correctly. Caliper bolts directly to the knuckle. Does anyone have the bolt part numbers and torque specs for those too? Just going to re-do all of them.
Jim, you are correct, Rear Caliper bolts directly to Rear Knuckle. Bolt Part Numbers for Rear Caliper to Knuckle are above - they are different than the Front Caliper Bracket/Adapter/Retainer to Front Knuckle.

The Bolt attaching Front Caliper to Caliper Bracket - there is a difference in length between our Racing Brake supplied bolts, and the OEM bolts IIRC.
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Old 06-06-2018, 04:29 PM
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Originally Posted by MBNRG View Post
Jim, you are correct, Rear Caliper bolts directly to Rear Knuckle. Bolt Part Numbers for Rear Caliper to Knuckle are above - they are different than the Front Caliper Bracket/Adapter/Retainer to Front Knuckle.

The Bolt attaching Front Caliper to Caliper Bracket - there is a difference in length between our Racing Brake supplied bolts, and the OEM bolts IIRC.
Yes, thatís right. I had reused the longer OEM red painted bolts, but now have the shorter RB bolts in there at 135ftlbs. If that turns out to be ~50ftlbs too much, I may have damaged the threads in the aluminum RB adapter. Still no definitive torque spec on these.
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Old 06-06-2018, 07:31 PM
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There're also allen key bolts, that directly holds the caliper to bracket,

as you know; no need to remove the hex bolts (at the knuckle) for replace Rotor or Pads,

just remove the allen key bolts, will do the job,,

*Allen Key bolt (M12x72), # "003 990 79 05"..

-;ZAYED;-

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Old 06-06-2018, 07:35 PM
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Originally Posted by cm60k View Post
There're also allen key bolts, that directly holds the caliper to bracket
Those are the bolts we are talking about over here.

https://mbworld.org/forums/c63-amg-w...e-caliper.html

Can't find the torque spec anywhere. Can you see the grade stamp on them anywhere?
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Old 06-06-2018, 07:51 PM
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Those are the bolts we are talking about HERE
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Old 06-06-2018, 08:07 PM
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As i remember;

*Hex bolts from bracket to knuckle is (115 Nm).

*Allen Key bolts from caliper to bracket is (128 Nm).

-;ZAYED;-
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Old 06-07-2018, 09:23 AM
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Originally Posted by BLKROKT View Post
Those are the bolts we are talking about HERE
Oh it's not in both places? My bad...
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Old 06-07-2018, 03:07 PM
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Originally Posted by cm60k View Post
As i remember;

*Hex bolts from bracket to knuckle is (115 Nm).

*Allen Key bolts from caliper to bracket is (128 Nm).

-;ZAYED;-
Awesome. Iím calling that 100ftlbs. Thanks.

Better than the doofus who wanted me to torque them to 40
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Old 06-07-2018, 04:34 PM
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Better do 130ft-lb just to be safe...
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Old 06-11-2018, 10:26 PM
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Should there be loctite on the Allen bolts? I ask because even before my track day it appears they were backing out on one side after being reinstalled three months ago.
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Old 06-12-2018, 12:12 PM
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Better to use 242 or 243 medium strength loctite..

-;ZAYED;-



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Old 11-16-2018, 01:45 PM
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Originally Posted by BLKROKT View Post
My thread title is wrong. I meant caliper to adapter bolt. And torque. Got the bolts. Still donít have a good answer to the torque spec.

In the rear there there is no adapter if I remember correctly. Caliper bolts directly to the knuckle. Does anyone have the bolt part numbers and torque specs for those too? Just going to re-do all of them.
Did we ever get the specific torque spec for REAR caliper bolts to knuckle? I was in there last night inspecting some things, had to pop off the endlink to get a wrench on the bolts, and I don't know what kinda torque wrench you guys use but there was no way in hell my torque wrench would fit in the wheel well space and allow me to lever on it.
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Old 11-16-2018, 02:31 PM
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Yeah you ideally have to get it up in the air. Like on a lift. Very difficult with car on stands. I managed with a short extension on the reverse-hex socket and a 3/8” torque wrench (my Precision has a v long handle). You’ll be crouching and pulling up on the drivers side and will have trouble keeping the socket on the bolts while getting enough leverage. It’s ripe for a chin whacker.

Mine are are all still at 135ft-lbs. No problems so far. Will redo all of them over the winter when I install new rotor rings and use the 100ft-lbs spec and blue Loctite.
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Old 11-20-2018, 09:29 PM
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I was just watching youtube. She installed caliper studs to replace the bolts we have been talking about. She has a GT350 but the caliper mounting is fairly similar to ours. I wonder if anyone makes a set of caliper studs that would work on our cars.

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Old 11-20-2018, 11:24 PM
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I think that caliper studs would be a real pain in the ***. I’d rather have all that thread in the adapter or knuckle than a nut on the end with a dozen threads holding it on that would be more likely to spin off. Plus, it’s tight in there. I think this is an instance of trying to stud something for no benefit. If race cars don’t use studs then why would anyone do this? I just don’t see a benefit, only drawbacks.
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