no clearance. rotor and abutment.

[80proZ]

C5 disc brake upgrade on a camaro 8.5" rear. New Yukon axles(stock length, 31 spline).
Using kore3 brackets,factory abutments and DBA rotors. There is no clearance on the inboard side and a little over an 1/8" outboard. This is on both abutments(LH&RH).
Everything looks good other than the clearance issue.
Can a spacer be made from sheet metal to bring the rotor out? Am I missing something?
Thanks in advance.

[tommycomfort]

A picture sure would help. If not, I'm sure Tobin @ Kore3 will be glad to help.

[80proZ]

[Quickboat]

I doubt you are supposed to have 4 washers under that bolt either.

[80proZ]

That would be correct! The bolt it to long and also makes contact with the rotor.

[Quickboat]

Got a shot from different angles so the brackets and such are more visable?

[Quickboat]

Can the brakets go behind the axle flange?

[80proZ]

It can not.

[80proZ]

I just have it mocked up, but everything else checks outs.

[Quickboat]

Those Yukons have what a 3/8" flange? Is this kit for 1/2" flanged axles? That would give you the 1/8" you need...

[80proZ]

The Yukon flanges are slightly thicker than the stock flanges. But I would guess if I put the factory axles in(which I can't),that it would possibly be worse.

[Apogee]

Have you measured the axle/brake offset dimension? This is the dimension from the outside of the housing end flange to the outside of the axle shaft flange where the rotor mounts. Factory on a second-gen should be 2.81". Is yours 2.81", 2.75" or something shorter? It looks shorter, but we'll let the precision measuring instruments determine that one way or the other. If the axles are short and you plan to run them anyway, I would machine down the PABs where they contact the caliper mounting bracket before running a spacer between the axle and the rotor, just because those tend to invite runnout in the long run.

Just a side note, did you get 25mm hex heads or 30mm for the M14x2.0 caliper mounting bolts? You should have gotten the 25's, so let me know if I should be throwing some in the mail.

Tobin
KORE3

[80proZ]

I'll measure it all tomorrow Tobin! Thanks.

[jpgolf14]

Looks like an axle offset issue to me. Remember if you have a zero gap on one side and 1/8" on the other, than you are only off by 1/16".

[80proZ]

Axle/brake offset measures 2.66". So machining the abutment bracket would be optimum?
And the bolts are 25mm. No need to send me new ones. I appreciate the input, more than new bolts.
Thank you.

[Apogee]

Stock length Yukon's eh? Optimum would be a 2.81" brake/axle offset dimension, however in lieu of that, you can machine the PAB's half the distance as pointed out by John above. The PAB rotor gap measures about 30mm [1.181"] and the rotor 26mm [1.020"], so you should be aiming fpr 2mm [.08"] clearance per side +/- .5mm [.02"] from center.

Tobin
KORE3

[80proZ]

Thanks Tobin.

[Skip Fix]

That is pretty short for a second gen. The 2.81 or 2.75 are the two "normal" offsets. Axle should be 30 1/8 long from axle button to outside of flange. My 81 TA 8.5 is 2.75" offset.

Right rotor? most rears I have seen have a little more offset also.