84 Rear brake issue (Page 1/1)
Grumsfiero JAN 21, 12:55 PM
Gentlemen, first post, thanks for having me.
I found an older thread while googling regarding a fitment issue when installing new pads and rotors on an 84. The guy couldn’t get everything to fit and wondered if the rotor was too thick or if the piston wasn’t depressed enough. Eventually he thought he’d gotten the inside front pad mixed with the inside rear as the two are the same footprint but different thicknesses. We’ll I’m here to tell you he wasn’t losing his mind, like I have been for the last two days, the rear pads being sold under the Centric brand are too thick to make everything fit. I had a separate sealed box of front pads and they do indeed have a thinner pad which when paired with the outer rear pad makes everything fit properly. The thick rear pad can then be used on the front because the front piston depresses in further than the rear. Sorry for the long explanation but I hope this helps someone else.
Grumsfiero JAN 21, 04:11 PM
Edit:
Moving the rear pad forward creates the same issue. I will assume that the Centric brake pads for the rear are incorrect. The inside pad is several mil too thick.
Gall757 JAN 21, 05:22 PM
RockAuto shows this number:

CENTRIC 10202620 C-TEK
Dennis LaGrua JAN 22, 05:00 PM
It sounds like your mechanic may not be retracting the rear caliper pistons properly. The best way to do that is by using the adjusting screw at the back. Some have done it by twisting the piston from the inside end but I've never had any luck with that . You take off the nut then adjustment lever, seals and turn the shaft by hand and the piston will retract into the bore. If you try to use the brake piston compression tool you will damage the caliper internally. IMO, the Fiero rear breaking system leaves quite a bit to be desired but you can get it to work with a bit of fiddling

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Grumsfiero JAN 22, 05:17 PM

quote
Originally posted by Gall757:

RockAuto shows this number:

CENTRIC 10202620 C-TEK



Yes, those were the ones ordered. I’ve compared the pads to some old ones on another project car with a recently replaced rear caliper and there is a noticeable difference in thickness. Granted the old ones had some wear, but the difference is quite different.
Grumsfiero JAN 22, 05:23 PM

quote
Originally posted by Dennis LaGrua:

It sounds like your mechanic may not be retracting the rear caliper pistons properly. The best way to do that is by using the adjusting screw at the back. Some have done it by twisting the piston from the inside end but I've never had any luck with that . You take off the nut then adjustment lever, seals and turn the shaft by hand and the piston will retract into the bore. If you try to use the brake piston compression tool you will damage the caliper internally. IMO, the Fiero rear breaking system leaves quite a bit to be desired but you can get it to work with a bit of fiddling




Quite correct Dennis. I’m the mechanic on this job and I’ve definitely got them compressed all the way ( double checked with the Ogre’s info ). I’ve got a similar set in my ‘80 T/A so I’m comfortable working on them. It seems to boil down to the pad thickness. Weird???