Blaq Ops

There are 2 different length bolts that hold the GS calipers on. Which goes where?

BEZ06

I'm interested to hear the answer!!

This is curious - I thought the GS had the same brakes as the Z06, and my Z06 caliper bolts are all the same.

Bob

B y r o n

I just switched pads a couple of weeks ago and didn't notice any difference in the bolt length. Which corner or which end?

scootertrash19

Do you have both sides apart? If not pull off the opposite side and compair which bolt is which.

Blaq Ops

I thought so too. That's why I didn't look when taking them out. I think it was 1 long and 1 shorter one per wheel.

All of them are apart. I just got calipers back from Mike.

Blaq Ops

4 of them are (approx.) 1 7/8 long and 4 are (approx.) 2 1/8 long.

B y r o n

I only had one caliper off at a time and both bolts were the same lenght, visually. I didn't notice if the fronts or the rears were longer. I'm just guessing but look at the thickness of the caliper where he bolt goes through and see if the fronts are thicker and my guess would take the longer bolts, but I'm just guessing.

CGZO6

Yes
What he said

Blaq Ops

I checked and they are the same thickness *** the back. I ran the bolts through and they stick out the back of the bracket. They don't seem to interfere with the rotor though. They just protrude into the hub. I think they were all supposed to be the same size and for some reason they had to substitue the longer ones. Maybe a shortage.

Don-Vette

I always put the bolts back into the holes they came from when I take stuff apart. Besides, a 6" scale is a machine builders best friend.

Blaq Ops

Lesson Learned. I am usually very careful but this time rushed to get them in the mail

vetteright

The 2 1/8" long bolts are the caliper bracket bolts.

Blaq Ops

I hate to sound totally stupid but is that the top hole or the bottom?

Leprkon

Don't know about the bolt sizes, but get your hiney over to Napa and get some of the glue for the bolts. You don't want one working lose and having a flopping caliper grab a rim... trust me you don't !!

BEZ06

First of all, there are no brackets for the the Z06/GS/ZR1 calipers - they are all monobloc calipers and bolt directly to the suspension knuckles.

The floating calipers on the base C6 have brackets, but not the Z06/GS/ZR1.

Second of all, after doing all the looking I care to do, my research shows only one size caliper bolt for ALL C6's - and it's an M14x2x47.

The "47" means it's 47mm long - and that's the shank of the bolt, measured from under the bolt head to the tip of the threads. 47mm is 1.85 inches, which is very close to 1-7/8 inches.

So.....Blaq Ops, if you've got 2 different lengths of bolts, I think the 2-1/8 inch long ones are something they used when they didn't have the correct ones available. I wouldn't worry about it - I'd put them in wherever you want and just make sure that the extra 1/4 inch of length doesn't allow them to hit anything, but I'm certain that the 1/4 inch won't be a problem at all.

Good luck, but don't worry about the 1/4 inch difference in length!!

BTW, I think we already talked about the loctite thing in another thread!!

Bob

Blaq Ops

Thanks to all of you guys!!! You always seem to come through no matter what the problem. This forum is not only entertaining but very very informative!! Beers on me if I ever meet any of you.

vetteright

The 2 1/8" bolts are for the caliper brackets on the base C6 or the base with Z51. They are GM part # 14084051 and they are larger than the caliper bolts. They come in a little plastic bag and have loctite pre-applied to the threads and cost about $4.50 each from GM. These are the bolts that the service manual says not to reuse.

BEZ06

with the part# above. That's the caliper bolt used on all C6's, and I believe C5's as well.

However, that bolt, in all references to it that I can find that identify the specs of the bolt, is an M14x2x47, and 47 is the length of the bolt in millimeters, and you can see that in the picture of a caliper bolt below.

47 mm divided by 25.4 mm per inch = 1.85 inches

1-7/8 inches = 1.875 inches

47 mm (1.85 inches) is very close to 1-7/8 inches.

We may just have a difference in the way we're measuring the bolt. The common convention for measuring bolts is that, for a bolt or screw with a "head", the length of the bolt is measured from under the head to the tip of the bolt. Here's a picture from the www.boltdepot.com site:



Below are a couple of pictures of C6 caliper bolts. You can see that the length from under the bolt head is 47 mm (and appears to be very close to 1-7/8 inches). However, the second picture shows that if you include the thickness of the bolt head in the measurement, the bolt could be considered about 2-1/8 inches, or about 54 mm long:







So.....the bolt with GM part# 14084051 has a spec of M14x2x47, which makes it a 47 millimeter long bolt, which is very close to 1-78 inches.

At least that's my experience with the caliper bolts on my 2005 C6 (and BTW, the pictures above are of bolts that came off that '05 base C6), and my 2006 Z06 which uses the exact same 47 mm bolts.

Bob

Blaq Ops

They don't seem to be interfering right now. I'm going to get the brakes back up and then drive it to the dealership and have them to deal with it. Do I have to loctite the banjo bolt also?

BEZ06

No loctite is needed on the banjo bolts.

BTW, they could well have changed the spec on the caliper bolts somewhere through the years.

Bob