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-   -   Nova drum Master Cylinder compatibility with front discs...need fast help! (http://www.hotrodders.com/forum/nova-drum-master-cylinder-compatibility-front-discs-need-fast-help-79436.html)

Warrant 01-21-2006 05:41 PM

Nova drum Master Cylinder compatibility with front discs...need fast help!
 
Im assembling my front disc brakes for my 1972 nova tonight, it uses a custom bracket that mounts rear camaro rotors with front celebrity calipers...the nova now has all drums, will my master cyilinder work without any mods? porportioning valve? residual valve? Thanks!

poncho62 01-21-2006 08:51 PM

The disk/drum M/C has different valving than the drum/drum........I would imagine the proportioning valve is different also.

67 Deuce 4 Me 01-21-2006 09:18 PM

I asked the guys at Scarebird about this and thay said drum drum master would be ok. Thats what I have on mine now and it works fine. They said that I wasn't pleased with the stopping power to switch to a disk drum master and proportioning valve.

Warrant 01-21-2006 09:27 PM

I see, I will use my current MC, if Im not satisfied Ill look for a new power booster setup. Those scarebird brackets are really slick ehh... Thanks!

302 Z28 01-22-2006 07:49 AM

I did something similar years ago when I converted my 69 Camaro to front disks. I did not initially use a MC for disk brakes. It stopped OK, a little better than drums, but not what I expected disks to do. The original MC went south so I opted for a Corvette MC with front disks and rear drums, along with the proper proportioning valving. The difference was night and day, all of a sudden my Camaro had vastly improved braking.

Vince

IanRiordan 01-25-2006 06:36 AM

Drum brake master cyls generally have a non return valve behind the brass cone in the m/c outlet. If you convert from drum to disc on either or both axles you must lose this valve (spring and split rubber cup.)
Disconnect the appropriate brake line, screw a self tapper into the cone and using a pair of side cutters pry it out. discard the valve, refit the cone and bleed brakes.
The valve is only there to maintain fluid at the wheel/cyls - calipers don't have return springs.


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