PBR'S worth the upgrade?
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Joined: Jun 2014
Posts: 360
Likes: 3
From: South Jersey
Car: 88 GTA Notch/01'WS-6 VERT
Engine: 5.0 LB-9/5.7 LS-1
Transmission: 700R-4/4L60
Axle/Gears: borg warner 3.27's
PBR'S worth the upgrade?
Hello all, I have the chance to upgrade my factory iron delco moraine calipers to PBR's just wondering if it is really worth the upgrade or not and if so is the prop valve somehow different then the one I already have since my car is already a 4 wheel disc car?
Joined: Jun 2000
Posts: 5,364
Likes: 51
From: Enschede, Netherlands
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: PBR'S worth the upgrade?
Yes, def worth it. No more parking brake issues, calipers that actually work.
Re: PBR'S worth the upgrade?
I converted to them on my second gen and they work great. Will be doing it to the IROC in the next year or two. Shouldn't need to change the prop valve since it is already 4 wheel disc.
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: PBR'S worth the upgrade?
There are different valves for different applications: Disc/drum, disc/disc (Delco-Moraine) and disc/disc (PBR). Personally, I'd use the one designed for my braking system. 
You might check the following FAQ for more info about combination valves, master cylinders and parking brake cables:
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
You might check the following FAQ for more info about combination valves, master cylinders and parking brake cables:
https://www.thirdgen.org/forums/tran...-10-bolts.html
JamesC
Last edited by JamesC; Nov 17, 2015 at 07:35 AM. Reason: Additional info
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Joined: Sep 2010
Posts: 1,928
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From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: PBR'S worth the upgrade?
Absolutely worth it. Even better put in an adjustable prop valve as well so you can crank up the rear braking even more to get the most out of it. Made a significant difference for me.
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Joined: Aug 2012
Posts: 418
Likes: 1
From: Lascassas TN
Car: 1989 IROC G92 LB9 MK6
Engine: LB9
Transmission: MK6
Axle/Gears: 3.45
Re: PBR'S worth the upgrade?
Change 'em, 4 wheel disc is a misnomer with the delco iron rear calipers....more like 2 wheel disc brakes.
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