Correct caliper mounting bolts
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 878
Likes: 60
From: Minneapolis, MN USA
Correct caliper mounting bolts
I have rebuilt my calipers and am going to mount them. I also purchased new caliper mounting bolts...just cuz...and trying to get things more correct.
From the reading I have done, I think it's clear that the mounting bolts for the front calipers are supposed to be longer than the mounting bolts for the rear calipers. Specifically, I think they are supposed to be 1-1/4" long for the front.
The set of bolts I purchased came and there are four bolts 1-1/4 long that are yellow zinc plated....and four bolts that are only 1" long that are black, not yellow. The label on the bag even specifically says the fonts should be yellow and the backs should be black. Anyone have an idea why this would be?
More importantly - Most of the reading I have found suggest the back bolts should be 1-1/8" long. The ones I received are only 1" long...and frankly, these feel too short when you account for the thickness of the split-lock washer.
So - what should the rear mounting bolts be? 1" long? 1-1/8" long? Yellow zinc plated, or black?
Thanks!
From the reading I have done, I think it's clear that the mounting bolts for the front calipers are supposed to be longer than the mounting bolts for the rear calipers. Specifically, I think they are supposed to be 1-1/4" long for the front.
The set of bolts I purchased came and there are four bolts 1-1/4 long that are yellow zinc plated....and four bolts that are only 1" long that are black, not yellow. The label on the bag even specifically says the fonts should be yellow and the backs should be black. Anyone have an idea why this would be?
More importantly - Most of the reading I have found suggest the back bolts should be 1-1/8" long. The ones I received are only 1" long...and frankly, these feel too short when you account for the thickness of the split-lock washer.
So - what should the rear mounting bolts be? 1" long? 1-1/8" long? Yellow zinc plated, or black?
Thanks!
Racer
Joined: Apr 2021
Posts: 430
Likes: 132
I have rebuilt my calipers and am going to mount them. I also purchased new caliper mounting bolts...just cuz...and trying to get things more correct.
From the reading I have done, I think it's clear that the mounting bolts for the front calipers are supposed to be longer than the mounting bolts for the rear calipers. Specifically, I think they are supposed to be 1-1/4" long for the front.
The set of bolts I purchased came and there are four bolts 1-1/4 long that are yellow zinc plated....and four bolts that are only 1" long that are black, not yellow. The label on the bag even specifically says the fonts should be yellow and the backs should be black. Anyone have an idea why this would be?
More importantly - Most of the reading I have found suggest the back bolts should be 1-1/8" long. The ones I received are only 1" long...and frankly, these feel too short when you account for the thickness of the split-lock washer.
So - what should the rear mounting bolts be? 1" long? 1-1/8" long? Yellow zinc plated, or black?
Thanks!
From the reading I have done, I think it's clear that the mounting bolts for the front calipers are supposed to be longer than the mounting bolts for the rear calipers. Specifically, I think they are supposed to be 1-1/4" long for the front.
The set of bolts I purchased came and there are four bolts 1-1/4 long that are yellow zinc plated....and four bolts that are only 1" long that are black, not yellow. The label on the bag even specifically says the fonts should be yellow and the backs should be black. Anyone have an idea why this would be?
More importantly - Most of the reading I have found suggest the back bolts should be 1-1/8" long. The ones I received are only 1" long...and frankly, these feel too short when you account for the thickness of the split-lock washer.
So - what should the rear mounting bolts be? 1" long? 1-1/8" long? Yellow zinc plated, or black?
Thanks!
I just bought the Caliper mounting bolt from top flight auto. I’ll post how they are when they get here.
https://www.topflightautomotive.com/...s-8-piece-set/
Race Director
Joined: Nov 2006
Posts: 13,236
Likes: 7,827
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
Have you thought to compare them to the ones you took out?
Race Director
Joined: Nov 2006
Posts: 13,236
Likes: 7,827
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
Fair enough. although I'm certain mine are factory original. no good reason to take them out with everything else I'm working on now.
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,987
From: Connecticut, USA
They are 7/16-20 x 1.125 shoulder bolts, too long and they may hit the rotor. They are the same as used for the TA flange Those pictured are not as original, they might be the right thread but no shoulder to them. Will they work, yes they will, would I use them - no.
Last edited by GTR1999; May 27, 2021 at 09:59 AM.
Melting Slicks
Joined: May 2002
Posts: 2,476
Likes: 756
From: Laporte, IN
The front and rear caliper mounting bolts are 7/16"x20x1-1/8". Grade 8. Very hard to find a 1-1/8" length 1" or 1-1/4" is easy below is what Corvette Central sells which is close but I think they 1" length.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Oct 2003
Posts: 2,189
Likes: 830
From: Chapel Hill NC
2025 c3 ('68-'73) of the Year Finalist - Unmodified
2025 C4 of the Year Finalist - Unmodified
2025 C8 Stingray of the Year Finalist - Unmodified
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 878
Likes: 60
From: Minneapolis, MN USA
So it seems the consensus is the correct length for the rear is 1-1/8. I'm still not clear on why the different finish between front and rear. I understand the concern about the bolt being too long. Does anyone else feel squirmy about it only being 1" long (too short)?
Race Director
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
what if you leave the lock washer off? i don't recall seeing a split lock washer on any caliper bolt ever. and i think the different color is to say which goes where.
Last edited by derekderek; May 27, 2021 at 03:48 PM.
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 878
Likes: 60
From: Minneapolis, MN USA
Thx - that would certainly save a little space and give more thread engagement. But I think every corvette parts retailer shows their kit as containing these split lock washers.