Do I need a new proportioning valve when swapping drum to disc?
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Junior Member
Joined: Aug 2013
Posts: 12
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Car: 1990 IROCZ
Engine: LB9
Transmission: T5
Axle/Gears: No RPO codes
Do I need a new proportioning valve when swapping drum to disc?
So I'm converting my rear drums to discs via the hawks kit, will everything i need to get them on and working be provided or will i also have to buy a new proportioning valve for the new disc lines?
http://www.hawksthirdgenparts.com/pr...rsion-Kit.html
http://www.hawksthirdgenparts.com/pr...rsion-Kit.html
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: Do I need a new proportioning valve when swapping drum to disc?
http://www.flynbye.com/id71.html
For best braking performance you'll need the correct combination valve. Your 90 may have the first or second design tube nut threads. Search for the spring change or info on an adjustable.
More info that you may find helpful:
https://www.thirdgen.org/forums/faq-...iscs-89-a.html
JamesC
Re: Do I need a new proportioning valve when swapping drum to disc?
It's personal preference but in braking performance I wouldn't think that kit would offer much gain over stock drums. Im sure you could find a rear disc setup for a 4th gen for pretty cheap on ebay which the instal would be pretty simple. And as far as needing a prop valve goes it would be best in any car regardless of brake setup so you can adjust bias to your preference, but it's not entirely necessary.
Supreme Member
iTrader: (1)
Joined: Sep 2010
Posts: 1,928
Likes: 1
From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: Do I need a new proportioning valve when swapping drum to disc?
Go straight for the PBR disks and adjustable prop valve. One of the best (double) upgrades you can do. Even the adjustable valve on its own would make a big difference. Then add the disks when you can.
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