2nd Gen brake booster with factory disc/drums. need help

[Maverickhatter]

I have a 79 trans am I am doing a ls1 swap in. I eventually want to do the c5 brake swap for the front brakes but this swap has drained all my money (literally I am not finished and acquiring parts week to week hoping to get to completion) ,however, I have to replace my booster and rear wheel cylinders anyway cause they are faulty but don't want to put the old ugly master cylinder with the metal reservoir in it. I found one by detriot speed which is the style I want.The original website I found it on says compatible with any brake system but the detriot speed website says compatible with any baer brake system. I am posting links for both and looking for any feedback I can get on whether it will work with my factory disc/drum until I can get money for the brake swap and new tires to clear or has anyone had success with one that will work with my factory disc/brake setup as well as the swap when I can fund it?


http://www.camarocen...t_p/brc-575.htm original website I found it on



http://www.detroitsp...2-brk-bstr.html actual dse site that gives different info

[aps63]

Best thing to do is call Detroit Speed.
They have always been very helpful when I've called and asked questions about their parts.

[Apogee]

You have two primary concerns, MC bore size and residual pressure requirements. You can run a disc/disc master cylinder with a disc/drum application, however you'll want to add a 10 psi residual pressure valve (RPV) to the rear circuit for the rear drums. The RPV maintains pressure on the cup seals inside the wheel cylinders so they don't fold and burp air into the system when the primary shoe retracting spring collapses the wheel cylinder after the brakes have been released. As for bore size, that will be a function of your caliper piston area (and wheel cylinder in your case), booster size, vacuum level, etc. For reference, an 98-02 LS1 F-body application came with a dual-9" booster and 1" bore MC.

Tobin
KORE3

[aps63]

There you go.

[Skip Fix]

Factory disc/drum power had a 1 1/8 MC , manual 1" and a single diaphragm booster. 79-81 TA 4 WD had a dual diaphragm booster with 1 1/8-81 had the quick take up aluminum MC for the low drag fron calipers and a different dual booster for it's larger register.

[Maverickhatter]

I took aps63 advice and dropped them a line. DSE did verify it will work with factory disc/drum brakes as well as the baer system....I know what my next upgrade will be.

[badazz81z28]

I'm running a set-up nearly identical as the DSE set-up with "OEM Type" Disc/Disc and it operates fine. I do however have to correct combination valve for the set-up. I don't see how you would encounter issues as long as the rear/front pressure differential is correct.

You can see my set-up in my build thread.