Rear PBR's Scraping?
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Rear PBR's Scraping?
I just installed a 92 z28 rear 3.42 posi in place of my old 2.73 drum rear. I bought new PBR calipers from Thirdgen ranch for the rear. my rotors were used rotors in good condition with a little rust. I believe I hooked them up correctly, they were a real tight fit going onto the caliper. Now it seems the rear rotor just slides onto the lug bolts without any other way of securing them???.... anyway I hear a slight scraping sounds, kinda like someone is sharping a knife from the inside of the car. I tried to listen on the outside while my buddy drove it and cannot hear it from the outside??
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
hmm, I did notice the mounting bolts were sticking thru a bit, didnt look like they would touch when I put them on, Im not the smartest guy in the world but im kinda not understand what your saying about shims, can you explain to me a bit. are the mounting bolts suppose to stick out a little?
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
This is what it came with, the calipers, then I bought pads and put the pads inside the calipers, the only springs I seen were the 2 on the piston and then the ones on the bottom of the actual pads that hold the pads in the calipers.
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
What shims is tuneperformance talking about? like a spacer?
Last edited by BlueWrath92; 06-11-2012 at 11:02 AM. Reason: typo
#7
Re: Rear PBR's Scraping?
Maybe those PBR's are different then my 97 camaros, but it has little metal spring looking retainer things that seem to isolate the pads from the calipers, anyways mine makes scraping noises without them.
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#8
Re: Rear PBR's Scraping?
there are two ways to move the caliper mounting bracket, one with shims on the axle flange witch I like the best or two with washers between the caliper mounting bracket and anchor plate bracket.
http://andyz28.com/catalog.htm
http://andyz28.com/catalog.htm
#9
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Re: Rear PBR's Scraping?
You can see the shims (part #36 in the diagram above) in pic two of the following write-up:
https://www.thirdgen.org/forums/faq-...iscs-89-a.html
JamesC
https://www.thirdgen.org/forums/faq-...iscs-89-a.html
JamesC
Last edited by JamesC; 06-11-2012 at 12:12 PM.
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Car: 92 Z28
Engine: LS1
Transmission: T56
Axle/Gears: 3.73 10 bolt
Re: Rear PBR's Scraping?
Part #36 in his second picture. I'm not sure if these are still available though? And you have to pull the axle to change them out.- sorry beat me to it Andysz28 still has them
What is part #25 in the caliper break down? I don't remember this? Or is it the clip that goes on the side of the this metal frame to kind of hold that assemblage together?
What is part #25 in the caliper break down? I don't remember this? Or is it the clip that goes on the side of the this metal frame to kind of hold that assemblage together?
Last edited by grngryoutmyway; 06-11-2012 at 12:35 PM.
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
yall are still talking another language, are "shims" the spacer plates that are on the outside of the drums? I still have those...
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
this is only happening on my rear driver , and I can see where the brake caliper is rubbing on the rotor. Passanger side is fine no issues, I can hear ti scraping on right turns.
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
Well I just took the whole weekend to re-due my ENTIRE suspension front and back to include a 3.42 gear swap and PBR's. Im too worn out to take the whole rear off take my axles out to put that spacer on, I just threw in some washers between the caliper and the mounting plate... works great no more grinding
#16
Re: Rear PBR's Scraping?
Well I just took the whole weekend to re-due my ENTIRE suspension front and back to include a 3.42 gear swap and PBR's. Im too worn out to take the whole rear off take my axles out to put that spacer on, I just threw in some washers between the caliper and the mounting plate... works great no more grinding
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
Yea that was the problem you were spot on. those Shims are missing from both sides but for some weird reason the passenger side has good spacing without the shim or washer
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
No, Not between the axle flange and the backing plate. I put them between the backingplate and the caliper, it seemed to do the same thing would it hurt anything?
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
roger that I will be putting them between the axle flange/backing plate,I have another question for you. are the pads OK to touch the rotor? I read in a post somewhere the rear should spin freely? is that without any pad rubbing?
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
OK, I drove it on a 2 1/2hr drive today after finishing the above.. I thought I fixed it with them washers but I may have to space it more. If its rubbing ever so slightly could it mimmic the sound of a bad diff. like the sound of a spooling turbo?
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
I did replace the prop valve. I bought one from someone who c\said it was a disc/disc. but im afraid the rears arnt getting the pressure, is there anyway of checking a number on it or something?
Last edited by BlueWrath92; 06-12-2012 at 12:22 AM. Reason: wrong wording
#28
Re: Rear PBR's Scraping?
https://www.thirdgen.org/forums/brak...e-upgrade.html
I have never experienced a brake pad or shoes drag ever cause nose excessive heat and burning smell yes. The recommended clearance is for metal expansion.
I have never experienced a brake pad or shoes drag ever cause nose excessive heat and burning smell yes. The recommended clearance is for metal expansion.
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
If I hold the brake and step on the gas the fronts will hold and the rears will spin. That tells me there not getting the pressure and also the Brake Light is ON
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Re: Rear PBR's Scraping?
Normally the light comes on and stays on when part of the system has failed.
Here's a bit more info from the manual:
"The pressure differential warning switch is designed to constantly compare front and rear brake pressure from the master cylinder and energize the warning light on the dash in the event of a front or rear system failure. The valve and switch are so designed that the switch will latch in the "warning" position once a failure has occurred. The only way the light can be turned off is to repair the failure and apply a pedal force to develop approximately 450 psi line pressure."
BTW, will the parking brake hold? Or do the rotors spin with it on?
JamesC
Last edited by JamesC; 06-12-2012 at 06:27 AM.
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
I think I fixed it or it fixed itself. I went out and got them springs for the Cheap Prop Valve Upgrade thread and installed... the brake was very very stiff while trying to bleed, I could not get anything to come out. I Put back in the stocker, bled the lines again.. the right driver side didnt have much pressure but I bled them the best I could. put everything back together started the car and the brake light was still on... drove a little and it seemed to no be fixed. Turned the car back on and the brake light was off and I dont feel that resistance I had before. Wierd
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Car: 92 Z28
Engine: LS1
Transmission: T56
Axle/Gears: 3.73 10 bolt
Re: Rear PBR's Scraping?
There is a small set screw that adjust the pad to make good contact when the e brake is applied as well. I had to adjust this when I installed mine as well, I was getting that same kinda sound as one side of the pad was gently staying in contact with the rotor at all times.
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Car: 92 Camaro RS
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Axle/Gears: 10 Bolt 3.42 Posi
Re: Rear PBR's Scraping?
Yea I ended up doing the exact same thing. It was only off on the driver side rear, my pass side had natural perfect spacing... BUT I started hearing that scraping on the pass side, But there is no friction on the rotor. If you know why that would be id like some of you knowledge.
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