Caliper rebuild torque specs?

Post by **Yoda's Master** » Sun Feb 14, 2021 12:41 pm

Does anyone know the torque specs for the caliper bolts that bolts both halves together?

Post by **PapaSmurf2k3** » Tue Feb 16, 2021 11:00 am

If you know the size and the grade of the bolt, you can just go by the toque chart.

.
I'd probably add some loctite in there too.

YouTube · Post by **EdBwoy** » Tue Feb 16, 2021 11:10 am

Sorry I can't produce the numbers right now, but I know I went through some hurdles to get the torque spec. I tried combing through old videos to find them, but maybe I wrote them on a post-it note that has since been discarded.

Lessons learned
One thing I know is that I will never intentionally split those halves again. I had split them to allow the powdercoater better access upon request, but during installation it became more trouble than intended.
1. For me, no matter how well the tape job was done, some of the powdercoat cracked right at the mating surface when I bolted them together.
2. The rebuild kits in the market at the time assumed the halves wouldn't be split so they didn't offer that inner seal in the package (passes fluid inside the halves versus Brembo BBK that had a crossover tube).
Although the science seemed to hold up on my end, the only powdercoater I could find didn't want to try to bake anything with a rubber seal in it, so I decided to open them up and reuse the seals later.
3. Torque specs

Good luck with your project, and if I do find the numbers, I'll post them here.

Post by **Yoda's Master** » Tue Feb 16, 2021 8:27 pm

PapaSmurf2k3 wrote: ↑
Tue Feb 16, 2021 11:00 am
If you know the size and the grade of the bolt, you can just go by the toque chart.
.
I'd probably add some loctite in there too.

Nope. fasteners are not on the torque chart. Loctite won't be much help since it could melt off when the caliper gets hot. and no way would i use high temp red loctite.

Post by **Yoda's Master** » Tue Feb 16, 2021 8:28 pm

EdBwoy wrote: ↑
Tue Feb 16, 2021 11:10 am
Sorry I can't produce the numbers right now, but I know I went through some hurdles to get the torque spec. I tried combing through old videos to find them, but maybe I wrote them on a post-it note that has since been discarded.

Lessons learned
One thing I know is that I will never intentionally split those halves again. I had split them to allow the powdercoater better access upon request, but during installation it became more trouble than intended.
1. For me, no matter how well the tape job was done, some of the powdercoat cracked right at the mating surface when I bolted them together.
2. The rebuild kits in the market at the time assumed the halves wouldn't be split so they didn't offer that inner seal in the package (passes fluid inside the halves versus Brembo BBK that had a crossover tube).
Although the science seemed to hold up on my end, the only powdercoater I could find didn't want to try to bake anything with a rubber seal in it, so I decided to open them up and reuse the seals later.
3. Torque specs

Good luck with your project, and if I do find the numbers, I'll post them here.

Thanks. The newer kits have the inner seal.

Post by **C6Joe1957** » Tue Feb 23, 2021 12:50 pm

Late reply but I called Akebono USA last Friday and talked to an engineer named Jeff L. He did not readily know the torque specs for the sport calipers which, BTW they do not manufacture in Lexington KY USA. He said he would reach out to Akebono Japan to see what he could find out.

He called me this morning and left me a voicemail saying the torque specs for the 17mm "body bolts" are no less than 69.2 newton meters (51.04 ft-lbs) and no more than 93.6nm (69.04 ft-lbs). So, between 51-69 ft-lbs.

I called him back to see if he could explain the disparity of the two numbers and what are the conditions of those specs. IE, reused bolt or new bolt, new body halves or used body halves. Waiting to here back from him.

Post by **VStar650CL** » Tue Feb 23, 2021 1:21 pm

Considering the type of load they'd typically see, which is principally tension from heat expansion with some longitudinal torsion added when the brakes are applied, I'd think the evenness of torque across all 4 would be more important than a specific value. That might explain the wide variation in the spec. Since the factory personnel probably use tools with preset torque, it would be assumed they'd all be very close in tightness, although perhaps not at an exact value for every tool. Getting even torque also requires clean threads, so I'd imagine that would be de rigueur.

Post by **C6Joe1957** » Tue Feb 23, 2021 4:11 pm

VStar650CL wrote: ↑
Tue Feb 23, 2021 1:21 pm
Considering the type of load they'd typically see, which is principally tension from heat expansion with some longitudinal torsion added when the brakes are applied, I'd think the evenness of torque across all 4 would be more important than a specific value. That might explain the wide variation in the spec.

I'm not a Pro like you but if one is being very thorough with cleaning up all components and using new seals, would it be safe to simply split the hairs by using 81nm or 60 ft-lbs?

Post by **VStar650CL** » Tue Feb 23, 2021 5:19 pm

C6Joe1957 wrote: ↑
Tue Feb 23, 2021 4:11 pm
I'm not a Pro like you but if one is being very thorough with cleaning up all components and using new seals, would it be safe to simply split the hairs by using 81nm or 60 ft-lbs?

As mentioned, my impression is it's probably a production thing. Based on that, I'd say their engineers probably grounded the spec at the "ideal" number and then expanded it +/- to match tool tolerances and worst-case calculations. So yes, I think splitting the difference is exactly the right thing, chances are that's the "ideal" number.

Post by **Yoda's Master** » Tue Feb 23, 2021 8:09 pm

Nice. I didn't think there was a US based office to call. Did they happen to mention the torque for the 14mm bolt as well? front is 17mm, rear is 14mm. I'm thinking it's about 30 ft-lbs.

Post by **C6Joe1957** » Wed Feb 24, 2021 1:12 pm

Yoda's Master wrote: ↑
Tue Feb 23, 2021 8:09 pm
Did they happen to mention the torque for the 14mm bolt as well? front is 17mm, rear is 14mm. I'm thinking it's about 30 ft-lbs.

No, he did not but he hadn't called me back and when he does, I'll ask him.

Post by **Yoda's Master** » Wed Feb 24, 2021 3:56 pm

C6Joe1957 wrote: ↑
Wed Feb 24, 2021 1:12 pm

Yoda's Master wrote: ↑
Tue Feb 23, 2021 8:09 pm
Did they happen to mention the torque for the 14mm bolt as well? front is 17mm, rear is 14mm. I'm thinking it's about 30 ft-lbs.
No, he did not but he hadn't called me back and when he does, I'll ask him.

I emailed them separately also and was told the same for the front 69.2 - 93.6 Nm and 32.0 - 43.3 Nm for the rear.

The person I was emailing with wasn't able to tell me if the fasteners are installed dry or with a thread lubricant so maybe you can ask him that and to verify that I got the right info for the rear.

Caliper rebuild torque specs?

Caliper rebuild torque specs?

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