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Old 09-22-2009, 09:08 PM   #1
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Join Date: Oct 2005
Location: Central Coast, CA
Posts: 353
Car: 1987 IROC Z/28 Camaro
Engine: 355
Transmission: T56
Axle/Gears: 9 Bolt w/ 4.10s

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87 10 bolt drum to an 89 9 bolt disc...
I'm just trying to be clear on everything I need here.

From what I understand, I'm good to go except for the master cylinder? I just need a 4 wheel disc master cylinder correct?

Will my old e-brake cable work, or will I need a 9 bolt e-brake cable? What's the difference?

Anything else I'm forgetting? Thanks!
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Old 09-22-2009, 10:05 PM   #2
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Join Date: Aug 1999
Location: Lawrence, KS
Posts: 16,248
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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Re: 87 10 bolt drum to an 89 9 bolt disc...
Quote:
Originally Posted by Camaero View Post
From what I understand, I'm good to go except for the master cylinder? I just need a 4 wheel disc master cylinder correct?

Anything else I'm forgetting?
No need to change the master:

http://www.thirdgen.org/techboard/su...fferences.html (Master Cylinder Differences)

For best brake performance, however, you'll need to swap the proportioning valve. And, of course, you may need to change the drive and/or driven gears to make the speedo read correctly.

JamesC
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Last edited by JamesC; 09-22-2009 at 10:12 PM.
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Old 09-22-2009, 10:17 PM   #3
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Join Date: Oct 2005
Location: Central Coast, CA
Posts: 353
Car: 1987 IROC Z/28 Camaro
Engine: 355
Transmission: T56
Axle/Gears: 9 Bolt w/ 4.10s

Classifieds Rating: (0)
Re: 87 10 bolt drum to an 89 9 bolt disc...
Ah... I see! Does the prop valve need to come from a Chevy dealer?

Any idea about the ebrake cable?

Thanks again.
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Old 09-22-2009, 10:26 PM   #4
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Join Date: Aug 1999
Location: Lawrence, KS
Posts: 16,248
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

Classifieds Rating: (3)
Re: 87 10 bolt drum to an 89 9 bolt disc...
Quote:
Originally Posted by Camaero View Post
Ah... I see! Does the prop valve need to come from a Chevy dealer? Any idea about the ebrake cable?
Try the classifieds or the following site for the valve:

http://www.flynbye.com/

Drum cables won't fit. I assume on an 89, you'll have 11.7" rotors and PBR calipers. This latter is the set-up (J65) you should buy for.

JamesC
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Old 09-23-2009, 07:34 AM   #5
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Car: 1987 Black IROC-Z (original owner)
Engine: 350 Crate with TPI
Transmission: 700R4 with 2400 SLP Stall

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Re: 87 10 bolt drum to an 89 9 bolt disc...
Changes required for the 9-bolt swap...
1) Proportioning valve for the 9-bolt (master cylinder dose not require changing).
2) The parking brake cables for the 9-Bolt (old 10-bolt cables will NOT work).
3) Flaring tool for brake lines ( may be different). Was for me.

Did this swap nine years ago.
Last edited by DJP87Z28; 10-10-2009 at 08:36 AM.
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Old 09-23-2009, 07:34 AM
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