ken23434

I bought the bracket kit to put the PBR brakes in place of the iron ones for my 9 bolt. Got them from FlynBye site (Ed Miller).

I was finally getting to mocking them up and I am having issues w the caliper bracket bolts touching the inside of the disk and the outside of the bracket touching the outside of the rotor.

I didn't get any instructions or diagrams w the kit.

It has 4 large washers that make it better if I put them between the bracket mounted to the axle housing and the caliper bracket, but the bolt is still too long and will touch the rotor.
The outside of the caliper bracket is still extremely close if not touching the outside of the rotor.

I took all four washers that came with the kit and double stacked them on a single side and by doing that the bracket and the rotor appear to be centered on each other with a good gap on each side, however, the caliper mounting bolt still just barely touches the rotor when fully tightened.

I've seen various posts where people have done the PBR rear brake conversion but I haven't seen any pictures or diagrams showing the hardware stack up. Of course, the service manual doesn't show any washers or spacers since the brackets are made different than the ones I bought.

It seems like if I put two washers between the abutment bracket and the axle housing bracket and then a washer under the head of the caliper bolt then everything would fit the aligned with no rubbing. However, I expected the kit to be bolt on and not require me to modify things. That makes me think I'm doing something wrong.

I reverified the rotors I purchased are the correct part number. I ordered rotors for a 89 to 92 camaro. So unless they put wrong rotors in both boxes then I have the correct rotors for this conversion.

ken23434

I might have a solution/fix but I am still not certain that I am doing this correctly.

I pick up some M12 and 7/16" grade 8 zinc coated flat washers. The ID is nearly the same but they are slightly different thicknesses.

I did a combination of them to try and get the caliper bracket centered over the rotor. Also, by changing which washer is under the bolt head I was able to minimize the bolt protrusion so the bolt did not touch the rotor.

For the 4 bolt locations between the two sides, I have a different stack up of washers to make it work.

If this is the final solution, I am worried about future maintenance. Once those washers fall out, it is likely to not know the correct locations to have the bracket properly centered.

I am wondering if I should tack weld them to the bracket attached to the axel housing. That way, there would never be any trouble keeping track of the washers.

Welding washers to a bracket seems to not be normal.

Any advice or other ideas?

Denis.V

According car manufacturer's technical manuals, the shims and washers are the right procedure for body panels adjustments & other small differences.

My rear window panel was adjusted in the factory with 2 square washers in drivers side and only 1 in the passenger side.

Then, you are right adjusting caliper via 1 or 2 washer (one side could be different than the other).

And remember that the fabrication process have "tolerance" in sizes & specifications. You could have a 9 bolt rear end different than mine.

John in RI

iTrader: (167)

Some - and I have only seen this VERY RARELY - but SOME rear ends used a spacer installed at the axle flange to push the backing plate out a bit. It looks like your setup would benefit from such a spacer by moving the backing plate to a better position. ( wouldn't help the caliper bolt length, but it would have centered the caliper properly. )

Using washers is probably going to be just fine,...... I've never stacked washers in this spot in the past, but I have installed a single washer @ each hole to center calipers before. ( IIRC the only area of the caliper that actually touches the backing plate is right around the mounting holes. ) As long as the bolt isn't touching it should be fine, the rotor isn't going to move any closer to it, so it just needs to be far enough from the rotor to not touch it. If you want a bit more clearance,.... cut/shave off some of the bolt length with a cutting wheel or grinder and use a bit of blue Threadlocker for good measure.

I wouldn't weld them in place ----> but that's me. You could just cut/grind lines in the washers & backing plate for ID purposes, 1 line for the driver caliper washers and 2 lines for the pass side caliper or something like that. ( got to assume that both caliper mounting holes on the same side are using the same combination of washers to keep the pads flat/even with the rotor ?!? )

articwhiteZ

iTrader: (56)

articwhiteZ

iTrader: (56)

any help?

NO WASHERS factory brake set up 92 Z28. note axle tube flange. when Curry enterprise did my 9" ford housing..they goofed and I missed it.. untill install.. the flange is out of wack standing up and not layed down.. dont know why..

Look at the mounting plates..look how they drilled the 2nd set of Holes..lol every thing still bolted up just fine..but WTF.. all the others 9" housing's the flange is not standing up and no need to drill 2nd holes..I got this from them back in 1992'93..

test fit with Pads..all is well..