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Old 06-20-2009, 09:47 PM   #1
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Join Date: Mar 2009
Location: SAN ANTONIO TEXAS
Posts: 90
Car: 89 IROC Z28
Engine: 5.7 L Edelbrock perf /holley 3310
Transmission: 700R4
Axle/Gears: BW 9 BOLT 3:27

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J65 BRAKES

my iroc has the rpo code j65 brakes. the fronts have a single piston caliper setup, the rear are pbr aluminum calipers. i need to repair the front brakes. the parts guy at o'reillys said the car came with dual piston alum calipers and i should upgrade to these. if i buy these will they fit. the remans are cardone 18-4343/44 and it includes hardware. so is this a easy swap and repair job.
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Old 06-20-2009, 10:17 PM   #2
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Join Date: Aug 2001
Location: Nothern VA
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Car: 1989 Iroc-Z
Engine: 350, ZZ4 equivalent
Transmission: Pro-Built Road Race 700R4
Axle/Gears: 3.23 Dana 44

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Re: J65 BRAKES

You have to modify the spindle, buy 1LE rotors, and more. Here is a 1LE brake upgrade how-to: http://www.ws6transam.org/1LEbrake.html

If you want to go the brake upgrade route you may want to consider some other options link C4, LS1 brakes.
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1989 IROC-Z 350, Blue, T-Tops
Blue 1989 IROC-Z T-tops
Engine: 350 ZZ4 Equivalent (ZZ4 Heads, cam, pistons, and rods) / Accel TPI Baseplate / TPIS Large Tube Runners / DIY chip / and a bunch of other odds and ends
Drivetrain: Pro-Built Road Race 700R4 Tranny / Vigilante TC, 2600 Stall / LS1 Driveshaft / DANA 44 Rear w\ Moser Axles, 3.23 Gears, Trac-Loc LSD
Chassis & Suspension: Spohn Sub-Frame connectors / C4-HD Brakes / Polished 16" IROC Rims

Website: My Website, Brake Upgrade How-to, etc ~Luke
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Old 06-20-2009, 10:33 PM   #3
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Axle/Gears: BW 9 BOLT 3:27

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Re: J65 BRAKES

thanks for the info, did your iroc come with the australian pbr brakes in the rear when you bought it.
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Old 06-20-2009, 10:45 PM   #4
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Location: Nothern VA
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Car: 1989 Iroc-Z
Engine: 350, ZZ4 equivalent
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Re: J65 BRAKES

My car came with 11.67" rear with PBR aluminum calipers and 10.50" front with single piston iron caliper. I upgraded to C4 HD 13-inch front brakes. If you are interested in doing so click the link in my signature to my website, I have a full how-to there.
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Old 06-20-2009, 10:51 PM   #5
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Location: SAN ANTONIO TEXAS
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Car: 89 IROC Z28
Engine: 5.7 L Edelbrock perf /holley 3310
Transmission: 700R4
Axle/Gears: BW 9 BOLT 3:27

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Re: J65 BRAKES

thanks, i already read your site and it is professionally done. so the auto parts guy is wrong then, i can't install the pbr front calipers without these mods. he did not mention the car needed a 1LE RPO to use these brakes. i guess i'll have to replace the regular calipers then.
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Old 06-21-2009, 06:30 AM   #6
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Re: J65 BRAKES

Quote:
Originally Posted by marine68 View Post
thanks, i already read your site and it is professionally done. so the auto parts guy is wrong then, i can't install the pbr front calipers without these mods. he did not mention the car needed a 1LE RPO to use these brakes. i guess i'll have to replace the regular calipers then.
Unless your car was originally equipped with 1LE fronts, the standard four-wheel disc set-up is Delco-Moraine, single-piston, iron calipers with 10.5" front rotors and PBR, single-piston, alum calipers with 11.7" rear rotors. And, yes, the auto parts fellow is wrong. BTW, all 82-92 four-wheel disc cars are RPO J65, regardless of caliper type or rotor size.

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Old 06-21-2009, 06:30 AM
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