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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Brake booster and master cylinder for 4-wheel disc brakes

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Brake booster and master cylinder for 4-wheel disc brakes Empty Brake booster and master cylinder for 4-wheel disc brakes

Post by Showtime73 Sat Jul 15, 2017 3:42 pm

I've read through all of the brake posts in forum and trying to find the right setup, but there's a ton to decipher. Can you guys running 4-wheel disc brakes post your booster & MC setup, and why you like or dislike it?

If there was anything you wish you had done add it in too. Asking before I pull the trigger on my next purchaser. The brake guy I'm talking to recommends rebuilding the factory setup, or he can provide a dual diaphragm 9in power booster setup up, then there's hydroboost. Drop a message below and let us know what working for you.

Thanks,
Nick
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Brake booster and master cylinder for 4-wheel disc brakes Empty Re: Brake booster and master cylinder for 4-wheel disc brakes

Post by brownbomber77 Fri Nov 10, 2017 12:34 pm

Factory...ha. Consider the B bodies didn't change the master cylinder or anything when they made the Impala SS and the Caprice in the mid 90's. It's the same 7/8 bore. I just installed an Impala SS rear end in my neighbor's '84 Caprice. Plug and play. Brakes are great with no change except the rear axle with disc brakes.

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Post by thatfnthing Fri Nov 10, 2017 1:29 pm

brownbomber77 wrote:Consider the B bodies didn't change the master cylinder or anything when they made the Impala SS and the Caprice in the mid 90's.  It's the same 7/8 bore.

Nope. Having done that exact swap, I can tell you the 90's Caprice/Impala/Roadmaster master cylinder and booster are not the same at all from the G3's.
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Post by Showtime73 Sat Nov 11, 2017 11:24 am

I ended up with the CPP kit.

MCPVS-4-118
MAN MSTR CYL & 4-DISC PROP VLV SIDE MOUNT; 1 1/8 BORE M/C
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Post by thatfnthing Mon Nov 13, 2017 10:32 am

Love to see progress photos as you go...
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Post by brownbomber77 Mon Nov 13, 2017 3:11 pm

Did you change to a manual proportioning valve? I'm just curious what's different about them?

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Post by Showtime73 Mon Nov 13, 2017 3:32 pm

I didn't, but my car hasn't been driven since the install. It'll go to paint this week, and I'll overload yo guys with pictures shortly after thanksgiving.
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Post by Showtime73 Mon Nov 13, 2017 3:36 pm

I'm actually glad you mentioned that. The brake fluid was flowing super strong right after the install, and I just read an article about how too much pressure can cause brake lock.

The CPP kit has a proportioning valve, it looks adjustable. I'll have to get a brake pressure gauge to see where it's sitting.
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