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Are these factory GM rear disc brakes?

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Old Jul 22, 2016 | 08:28 AM
  #1  
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From: Ohio
Car: 1991 Trans Am convertible
Engine: 5.0 tpi
Transmission: 700r4
Are these factory GM rear disc brakes?

Hi, I've never had a gm car with 4 wheel disc and need to change out my rear break pads. These are totally different than what GM uses in the front. If you can ID them for me and let me know what bass I need that would be great.

Btw this is on a 1991 trans am with ws6 package.

Also if there is a website instructions somewhere post a link!!

Thanks so much for any help,
Gary
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Old Jul 22, 2016 | 08:29 AM
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Car: 1991 Trans Am convertible
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Transmission: 700r4
Re: Are these factory GM rear disc brakes?

Only letting me post one pic at a time.
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Old Jul 22, 2016 | 08:30 AM
  #3  
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Car: 1991 Trans Am convertible
Engine: 5.0 tpi
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Re: Are these factory GM rear disc brakes?

One more
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Old Jul 22, 2016 | 08:41 AM
  #4  
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Are these factory GM rear disc brakes?

Those calipers are from a 93-97 but are the same(ish) from 89-92 then 93-97.
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Old Jul 22, 2016 | 08:45 AM
  #5  
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From: Ohio
Car: 1991 Trans Am convertible
Engine: 5.0 tpi
Transmission: 700r4
Re: Are these factory GM rear disc brakes?

Thank you so much, I guess I should order 93 pads. Are they different for 93 ws6 or just one standard pad for all firebird models?

Gary
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Old Jul 22, 2016 | 10:38 AM
  #6  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Are these factory GM rear disc brakes?

Replacement Pads for a 89-97 rear J65 car are pretty much the same.
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Old Jul 22, 2016 | 11:35 AM
  #7  
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Car: 1991 Trans Am convertible
Engine: 5.0 tpi
Transmission: 700r4
Re: Are these factory GM rear disc brakes?

Ok thanks!

Gary
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Old Jul 22, 2016 | 12:27 PM
  #8  
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From: Howard Lake, MN
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: Are these factory GM rear disc brakes?

those are the PBR rear calipers with the integral parking brake, should use the same pad from 89-97 at least.

pity someone painted them red, they look cool in bare aluminum...
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Old Jul 22, 2016 | 01:20 PM
  #9  
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Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Are these factory GM rear disc brakes?

You'll need to look for "w/performance package" or "1LE" pads.

JamesC

Last edited by JamesC; Jul 22, 2016 at 01:29 PM.
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Old Jul 22, 2016 | 01:31 PM
  #10  
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From: Ohio
Car: 1991 Trans Am convertible
Engine: 5.0 tpi
Transmission: 700r4
Re: Are these factory GM rear disc brakes?

Very cool info thanks guys. I think they got painted red because the car is red??

Gary
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Old Jul 22, 2016 | 10:09 PM
  #11  
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Are these factory GM rear disc brakes?

Most likely painted red because someone visited the accessory isle at autozone.
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Old Jul 30, 2016 | 04:53 PM
  #12  
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From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
Re: Are these factory GM rear disc brakes?

Originally Posted by TTOP350
Most likely painted red because someone visited the accessory isle at autozone.
come on...don't hateName:  20150703_223942.jpg
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Last edited by articwhiteZ; Jul 30, 2016 at 05:08 PM.
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Old Jul 31, 2016 | 07:45 AM
  #13  
TTOP350's Avatar
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Are these factory GM rear disc brakes?

Huge difference in what you did and the "on the car" paint job the OP has on his. ;-). Yours do look great but for some reason, I do like the aluminum look a bit better.
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Old Jul 31, 2016 | 02:48 PM
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From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
Re: Are these factory GM rear disc brakes?

had them buffed out.. just the aluminum...but wanted them to match the wilwoods on the front,(red)
ya cant see most of it...as they are swallowed by the rims.
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only a bit at the street view
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Last edited by articwhiteZ; Jul 31, 2016 at 02:53 PM.
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