Master cylinder for rear disc

[MY6.2SS]

Hello all,
There are a few old post on this subject, I am just checking to see what new applications are out now. Someone is always coming up with a better mouse trap !!!!
The rear disc I am using are the LS disc and later I will be putting the C5 disc up front.
Thanks for all the help, David

 

[Wraith]

I did mine with the easy button, hit up Wilwood with what calipers I was using so they could figure the piston volume and ordered on their recommendation. Lots of places to find the calculations online also. Of course remember the infamous "low-drag" G-body calipers that use a stepped bore master cylinder and angled seals, they have problems using straight bore master cylinders.

 

[81cutlass]

First thing you have to ask is what year is your car, 78-82 use one pilot diameter between the booster and master and 83-88 use a different style. Gotta know what style master you need (early or late)

I've got LS camaro front and blazer rear disks and use a late 80's B body caprice Wagon master. I had really poor pedal feel with the stock master but the caprice wagon part helped a lot with its bigger bore.

 

[abbey castro]

I'm using S10 (2 piston calipers) up front and J65 Camaro rear disks (1 piston calipers). I'm still using the original master cyl as well as brake booster (1987) I changed the proportioning valve to a disk/disk one. Brakes work fine, good pedal feel with no issues at all.

 

[64nailhead]

If you swap the front calipers to a larger capacity later, then whatever you do now will result in a deeper pedal when the larger calipers get put on. I think it will be very difficult to find a MC that will work with both front caliper setups.

 

[MY6.2SS]

First thing you have to ask is what year is your car, 78-82 use one pilot diameter between the booster and master and 83-88 use a different style. Gotta know what style master you need (early or late)

I've got LS camaro front and blazer rear disks and use a late 80's B body caprice Wagon master. I had really poor pedal feel with the stock master but the caprice wagon part helped a lot with its bigger bore.

My car is a 84 Monte Carlo.

 

[malibudave]

With the setup you described, 1.0” bore master cylinder with the stock booster.

1.125” bore master cylinder with a B-Body 12” dual diaphragm vacuum booster.

1.0” bore from a right hand drive 2000 s-10. RAYBESTOS MC390572. If the reservoir doesn’t fit under the hood, exchange the reservoir out with a 2000 Camaro reservoir.

NEW MASTER CYLINDER OPTION

This master bolts right in no mods and actually works AC DELCO Master Cylinder Part # 89056529 or 18M974 (same master)

maliburacing.com

1.125” bore master cylinder from a 2000 Chevrolet Express Van 1500. Switch out the Express Van reservoir with the stock 1984 G-Body reservoir.

 

[CuttyTee]

What’s up guys. I’m new here on the forum. Just dropped a gen3 in my 88 cutlass awhile back. I picked up a low mile posi today along with all the rear disk brake goodies from an 01 z28. I have a d/d proportioning valve coming but not sure with to do with the master. Has anyone ever heard of removing a valve in the master to make it work with rear disk??🤞

 

[Streetbu]

There is no valve in the master cylinder. What you are referring to is a residual pressure valve inside the disc/drum proportioning valve, which you've already taken care with the disc/disc valve.

 

[CuttyTee]

There is no valve in the master cylinder. What you are referring to is a residual pressure valve inside the disc/drum proportioning valve, which you've already taken care with the disc/disc valve

Okay, that makes sense thanks. Does everyone just use the OE master then?