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#1069204 - 01/13/21 09:20 PM Disc Brake conversion  
Joined: Jul 2001
Posts: 78
BoiseSS Offline
15+ Year
BoiseSS  Offline
15+ Year
Member

Joined: Jul 2001
Posts: 78
Boise, Id.
Quick question. If I'm converting the rear to disc and I have the Disc/Disc proportioning valve, do I still need a Disc/Disc master cylinder?


1985 Monte Carlo SS
[Linked Image]
Under construction with a LS376 with a 4L70E
#1069209 - 01/13/21 10:59 PM Re: Disc Brake conversion [Re: BoiseSS]  
Joined: Apr 2011
Posts: 1,090
Hunter79764 Offline
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Hunter79764  Offline
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Joined: Apr 2011
Posts: 1,090
Grand Prairie, Tx
I'd guess that having a matched master/prop valve/caliper volume "fully engineered" would be best and will get the most out of the system, but I think there's hundreds of guys who have seen a good improvement switching to rear discs and just doing the prop valve... Some folks much smarter than me might have a different take, but I don't think you "Have to" switch by any means. And it might depend on which rear brakes you are using as well.


Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1069222 - 01/14/21 05:58 AM Re: Disc Brake conversion [Re: BoiseSS]  
Joined: Nov 2007
Posts: 124
jons86 Offline
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jons86  Offline
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Joined: Nov 2007
Posts: 124
greensboro,nc
There many options, I want to do this soon too, Im thinking 8.8 w manual adj proportial vlv. Check utube

#1069223 - 01/14/21 05:59 AM Re: Disc Brake conversion [Re: BoiseSS]  
Joined: Nov 2007
Posts: 124
jons86 Offline
Member
jons86  Offline
Member

Joined: Nov 2007
Posts: 124
greensboro,nc
There many options, I want to do this soon too, Im thinking 8.8 w manual adj proportial vlv. Check utube

#1069250 - 01/15/21 06:59 PM Re: Disc Brake conversion [Re: BoiseSS]  
Joined: Apr 2008
Posts: 74
malibudave78 Offline
10+ Year
malibudave78  Offline
10+ Year
Member

Joined: Apr 2008
Posts: 74
Houston, TX
Usually, you have to upsize the master cylinder depending on what master cylinder you are using.

1978-1981 "g-bodies" have 24mm strait bore master cylinders used with the factory power booster.
1982-1988 g-bodies have step bore master cylinders with a larger bore 1.25+" for volume that necks down inside the bore to a smaller 24mm for higher line pressures.

If you have the step bore master cylinder, it may work fine depending on what rear caliper you run.
If you go with fairly large rear calipers, you will most likely need to upsize your master cylinder to a 1.0" bore master cylinder.

What rear caliper are you plan on using?

#1069251 - 01/15/21 08:58 PM Re: Disc Brake conversion [Re: malibudave78]  
Joined: Jul 2001
Posts: 78
BoiseSS Offline
15+ Year
BoiseSS  Offline
15+ Year
Member

Joined: Jul 2001
Posts: 78
Boise, Id.
I'm getting a Currie crate 12 bolt rear end with Ford 11" disc set up on it. The set set up is a Ford Explorer rear disc. Not sure on the specs. Since they're an OEM set up, I think I'll be fine with the stock Master. Thoughts?


1985 Monte Carlo SS
[Linked Image]
Under construction with a LS376 with a 4L70E
#1069254 - 01/16/21 02:44 AM Re: Disc Brake conversion [Re: BoiseSS]  
Joined: Dec 1999
Posts: 11,792
86ttop Offline
20+ Year
86ttop  Offline
20+ Year
Member

Joined: Dec 1999
Posts: 11,792
Brooksville, Fl
You'll need a disc/disc master cylinder and appropriate combo valve. Good luck!


Leo Paugh
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POW*MIA
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