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LS1 REAR caliper bracket->backing plate bolt size

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Old Nov 14, 2006 | 06:53 PM
  #1  
spartyon's Avatar
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From: winthrop harbor, il & plymouth, il
Car: 1986 camaro
Engine: 383 sbc
Transmission: th-400
Axle/Gears: 4th Gen 10 bolt/Detroit TrueTrac 4.
LS1 REAR caliper bracket->backing plate bolt size

I have searched relentlessly over the last 2 days and cannot find the bolt size for the caliper bracket to the parking brake assembly backing plate. I ordered the fronts through fastenal but now I need the rears.

Long story short. Attempted to install c5 rear brakes with the c5 bracket and bolts but the brackets don't fit and the bolts for the corvette are larger than the bolts for the LS1s.

Any help is much appreciated!
Peter
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Old Nov 14, 2006 | 07:33 PM
  #2  
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Be right back, I'll check for ya.....

(sound of running feet......)

It's a M12 x 1.75 x 30mm bolt, C5s use a M14 x 2.0 bolt

Ed
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Old Nov 14, 2006 | 07:54 PM
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From: winthrop harbor, il & plymouth, il
Car: 1986 camaro
Engine: 383 sbc
Transmission: th-400
Axle/Gears: 4th Gen 10 bolt/Detroit TrueTrac 4.
Once again, you da man Ed!
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Old Jan 8, 2008 | 08:46 PM
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From: Central Indiana
Car: 1984 Camaro Z28
Engine: Blueprint 383
Transmission: T-5
Axle/Gears: 3.73
Re: LS1 REAR caliper bracket->backing plate bolt size

Originally Posted by ebmiller88
Be right back, I'll check for ya.....

(sound of running feet......)

It's a M12 x 1.75 x 30mm bolt, C5s use a M14 x 2.0 bolt

Ed
Is this the backing plate to axle flange bolts? Not sure because he talks about the caliper bracket.
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Old Jan 8, 2008 | 11:03 PM
  #5  
ebmiller88's Avatar
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Re: LS1 REAR caliper bracket->backing plate bolt size

Originally Posted by Craig84Z
Is this the backing plate to axle flange bolts? Not sure because he talks about the caliper bracket.
No, that's the abutment to backing plate bolt. The bolts that hold the backing plate to the axle are around 7/16" or so. Again, I can check those I have in the shop.

Ed
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Old Jan 9, 2008 | 05:24 AM
  #6  
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From: Central Indiana
Car: 1984 Camaro Z28
Engine: Blueprint 383
Transmission: T-5
Axle/Gears: 3.73
Re: LS1 REAR caliper bracket->backing plate bolt size

Oh, okay. Thanks for double-checking for me sometime soon
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Old Jan 9, 2008 | 12:33 PM
  #7  
ebmiller88's Avatar
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Re: LS1 REAR caliper bracket->backing plate bolt size

The bolts that hold the backing plates onto the rearend are standard 3/8"-16 by 1 3/4" in length.

Ed
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Old Jan 9, 2008 | 03:31 PM
  #8  
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From: Central Indiana
Car: 1984 Camaro Z28
Engine: Blueprint 383
Transmission: T-5
Axle/Gears: 3.73
Re: LS1 REAR caliper bracket->backing plate bolt size

Thanks Ed.
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