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Trying to install the reman calipers on the front of my 79' and ran into a clearance problem. The caliper mounting flanges on the caliper won't fit the space between the bracket and the rotor. Left side fit fine, right side no-go. It appears that the new )made in China) rotors have the inner bearing pocket machined too deep which moved the rotor toward the mounting bracket. Circle 1 shows the boss on the caliper and the mounting bracket. Circle 2 shows the edge of the rotor and the inside corner of the caliper housing (which runs into the rotor). Any other ideas??
Is the backing plate of your brake pad FULLY compressing the pistons of the caliper....thus...not allowing it to allow the caliper to fit?
Try switching the rotors and verify that you DO have an incorrectly machined rotor if that is what you feel it is.
Knowing that you changed out rotors. You DID index them and not just slap them on. Because you do know that there is a high probability that they need to be indexed. OR...you can run into brake problems later.
Is the backing plate of your brake pad FULLY compressing the pistons of the caliper....thus...not allowing it to allow the caliper to fit?
Try switching the rotors and verify that you DO have an incorrectly machined rotor if that is what you feel it is.
Knowing that you changed out rotors. You DID index them and not just slap them on. Because you do know that there is a high probability that they need to be indexed. OR...you can run into brake problems later.
Thanks for the reply and video. No, I didn't checked the runout but will go do it. I did measure the distance between the rotor face and the caliper mounting plate and there is .050" less on the side I can't get to fit. Seems like a big difference. Yes, the brake shoe is back as far as it can go.
Last edited by Duke94; May 19, 2018 at 11:37 AM.
Reason: added info
OK, forgot that this was not a one piece hub/rotor. So I put the original rotor back on and the caliper fit with clearance to spare. Took a couple measurements and the distance from the rotor mounting surface (butts up to the hub) to the outer face is .100" longer on the new rotor. Measured the same dimension on the other new rotor and it was .050" longer than stock. It would seem that quality is out of control! These rotors are junk.
BUT I assume that your OLD rotors are not as thick and the new ones...so...the distance will be greater due to the new rotors are wider....so the distance will be closer on the new rotors..but wider on the old rotors.
The only difference I have ever found in front to rear rotors is that there are 2 holes drilled in the rear rotors so the parking brakes can be adjusted,. Other than that...they are the same. If I am wrong...correct me.
ALSO...general 'rule of thumb' I use when Ii am looking at the brakes. The seam where the two halves of the caliper are bolted together GENERALLY is in the dead center of the width of the cooling fins of the rotor.
BUT I assume that your OLD rotors are not as thick and the new ones...so...the distance will be greater due to the new rotors are wider....so the distance will be closer on the new rotors..but wider on the old rotors.
The only difference I have ever found in front to rear rotors is that there are 2 holes drilled in the rear rotors so the parking brakes can be adjusted,. Other than that...they are the same. If I am wrong...correct me.
ALSO...general 'rule of thumb' I use when Ii am looking at the brakes. The seam where the two halves of the caliper are bolted together GENERALLY is in the dead center of the width of the cooling fins of the rotor.
DUB
The old rotors are within .020" of the new ones. They are original to the car and had never been machined so they have a long way to go before they hit the min thickness. I should have just resurfaced the original (which I'm now going to do) instead of buying offshore replacements. The 2 aftermarket rotors aren't machined to the same dimensions being .050" different for the same feature.
The diameter and width are the same (11.75 X 1.25) but the dimensions inside the 'hat' are different front to rear.
Ah-Ha!! I measured the hat thickness on the new ones and it's .28, old ones are .38 so it appears they sent me REAR's instead of fronts. Since I need rears anyway, I guess all is not lost.
Thanks Peterbuilt
I had measured these along time ago on a flat piece of metal and they measured out the same. I was WRONG!!!
I am curious 'Duke94'. The rotor that is 'off'. Does it have the two holes that are drilled in it (opposite of each other) so you can adjust your parking brake adjuster??? OR...are there only 5 holes drilled in it for the wheel studs.
IF the rotor that is not working does NOT have these extra two holes in them. Then you cannot use it for the rear IF you care about your parking brake.
I had measured these along time ago on a flat piece of metal and they measured out the same. I was WRONG!!!
I am curious 'Duke94'. The rotor that is 'off'. Does it have the two holes that are drilled in it (opposite of each other) so you can adjust your parking brake adjuster??? OR...are there only 5 holes drilled in it for the wheel studs.
IF the rotor that is not working does NOT have these extra two holes in them. Then you cannot use it for the rear IF you care about your parking brake.
Front caliper fitment issue
