arod231

Ok this is the situation I have a 1992 camaro rs with rear drums, I'm swapping 1997 camaro pbr rear disc brakes just brakes not whole rearend. Mounting plates and shims mounted up fine, but when I put the disc rotor on my axle the caiper bracket will not slide between the rotor and the mounting bracket on the axle flange. Just wondering if anyone else has had this same problem before?

JamesC

iTrader: (5)

Welcome to TGO, arod.

Maybe some pics will be helpful.

https://www.thirdgen.org/forums/faq-...iscs-89-a.html

JamesC

novaderrik

are there any shims between the axle mounting flange and the bracket? if so, take them out..
if not, put a spacer between the rotor and axle to move the rotor out.

arod231

there is one shim between the axle flange and mounting bracket, but I wouldn't think that would make much of a difference. I probably need about 1/8 of inch clearance so the caliper bracket will slide in between the rotor and mounting bracket. I wonder if I could take a little metal off the cailper bracket or the axle mounting bracket? Or like you said have some kind of spacer to move the rotor up some.

91phoenix

iTrader: (5)

Somebody else had this problem but I do not remember what they did for a solution. First thind to do is to take the spacer out then you may need to have some machined off.

arod231

Thank you all for the help, about got it figured out did have to machine down the cailper bracket just not clearing in one little spot, but might just machine just a little more.

arod231

Update got the bracket to finally clear the rotor on passenger side now brake pads so close to rotors probably going to have to turn the new rotors down enough so the brake pads will have enough clearance to not rub the brake rotors. I had to shave off almost 1/8 of a inch so the caliper bracket would clear.

87350IROC

iTrader: (2)

That is not good. You need to make sure the caliper is centered over the rotor. Either by moving the caliper or moving the rotor. In your case, shimming the rotor out might be easier.

I suspect we are missing something though, as it doesn't sound normal to have to do this.

John

arod231

I know it sounds weird but everything lined up after I shaved a little off the caliper bracket, I think it has something to do with axle thickness on drum brakes or disc brake brackets on the later pbr's because their thicker than the early ones and the aftermarket brackets or thinner also.

arod231

ok I feel so stupid right now. I did get one side to fit right but on the drivers side I took to much metal off the brake cailper bracket, now I just want to start from scratch. I'm going to have to get two new brake brackets and try to use some kind of spacer to move the rotor out some. Can anyone tell me if you can use a wheel spacer in between the axle and rotor or use some washers to move the rotor out some?

87350IROC

iTrader: (2)

I would not use washers. They are not ground for flatness and thickness. You can use a wheel spacer at long as its small enough to fit in the rotor. How far do you think it needs to be spaced out?

arod231

I need around 1/8 of a inch. I read a few posts on other threads were a few had the same problem and it was on the later 3rd gen camaros with the later PBR brakes on 4th gen camaros. I just wonder if there is spacer that would fit in the inside of the rotor. If anyone can give me answer who has had the same problem and found a solution please help me. I appreciate everyone who has left a post to help me come up with a answer.

thomas1976

Not shure for your LT1 backing plates, but this http://www.flynbye.com/catalog/i29.html backing plates are a no brainer.
Here you can see how they fit on the axle https://www.thirdgen.org/forums/brak...m-o-e-j65.html

arod231

I would go that route if I would't have cut the axle flanges and drilled the mounting holes bigger, but thanks for the idea.

87350IROC

iTrader: (2)

Measure the inside of the rotor and go from there. Customs spacers are also an option and not that expensive.

http://www.summitracing.com/parts/GOR-SP601S/

^ 6" OD is probably pretty safe to fit inside the rotor.

arod231

Thanks 87350IROC that is exactly what I was looking for measured inside diameter and that one would fit perfect.

arod231

Does anyone know if the stock rear wheel spacers will fit the inside of stock rear rotors that had the later PBR brakes on them?

arod231

To anyone having the same problems I was having with the caliper bracket not having enough clearance to mount to the brake bracket. If you use the stock wheel spacers that was used on the 1988-1992 camaro 16 inch rear wheels in between the axle and brake rotor it will give you enough clearance to mount the cailper bracket. These spacers are 1/8 of an inch thick, will post some more pics when I have a chance.

Jeffs82TA

iTrader: (1)

make sure when it is all together the abutments are not rubbing the rotor or it will trash the rotors quik. Found that out the hard way on my 97 camaro

arod231

Will do thanks

JamesC

iTrader: (5)

My 85 IROC with 16" wheel had the spacer.

Jamesc

arod231

I was just listing the camaro years that I knew had a rear wheel spacer, I'm sure other years had them.

arod231

Here is some pics of the spacer on the axle. I'm excited because I am closer to getting the brake swap done.

arod231

No rubbing at all.

arod231

Some updated pics of the swap

arod231

more pics

arod231

e brake cables installed, they fit perfect.

arod231

Tomorrow going to change the proportional valve spring and bleed the brakes.

arod231

Have a question for anyone willing to help me. After I got the brake swap done and changed the proportional valve spring out was working great then it started raining outside so had to quit, but then I noticed on the drivers side the piston plunger didn't go back in, it has locked the brake pads to the brake rotors like I have put on the parking brake. I haven't bleed the brakes yet but just wondering if this has happened to anyone else before bleeding the brakes.

arod231

Ok guys bleed the brakes and passenger rear stops on a dime but the drivers side brake piston clamp rod will push out but will not retract back. Does anyone know the answer to this, there is no air in the lines that I can tell.

arod231

Nevermind I guess I'm not very patient, it's working now and just let me say to anyone doing this swap make sure you change the proportional valve spring because when I first did this swap the brakes were barely stopping. When I changed the spring it is amazing the difference, it stops on a dime now. Thanks to everyone for the help.

GTAman

iTrader: (2)

glad it's working now. i just changed my prop spring today, too. Which spring did you use? i used the 30#. all i need is someone to help me bleed brakes and then i can enjoy awesome brakes!

arod231

I used the 1ncr5 springs they were rated at 30. If you don't have another person to help you bleed the brakes just build a one man bleeder, I built one with a glass pickle jar,drilled a hole in the top and put a old steel brake line in the top and soldered the steel brake line to the jar and took a hot glue gun and put glue around were I soldered it to make sure it was sealed. Then I put the plastic tubing on the steel brake line coming out of jar and other end to the bleeder. It worked like a charm

GTAman

iTrader: (2)

sounds like a plan! thanks dude

arod231

You're welcome man, if I can help anyone with my experiences or mistakes I will gladly share my knowledge of the subject.