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Old 06-24-2015, 02:36 PM
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Brake conversion questions

Hello everyone,
So I just put a ford 9" in my 79 chevy malibu and went from drum brakes on the stock rear to single piston disc brakes on the 9". Went through and bled all the brakes several times. It has decent peddle pressure when the car is off but once it is started it looses it all and takes a while to come back up. I just used the stock master which supplies disc from and drum rear. Do I need a new master cylinder? Which one can I use? What would you do.
Thanks a bunch, Lane

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Old 06-24-2015, 03:20 PM
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You need a 4-wheel disc master cylinder, the disc/drum stock cylinder won't do it. I've used 68-81 Corvette masters on older stuff, but I don't know if it will fit on the metric chassis cars brake booster or firewall due to the angle of mounting on those cars..

I would think maybe you would need to look at '82-up F-body applications(Camaro/Firebird) with 4 wheel disc to possibly find a workable master may have to swap on the G-body angled reservoir though to make it work..

You probably will need an adjustable proportioning valve, the stock disc/drum valve won't be may have to gut the stock prop valve and use it as just a junction/distribution block.

Have you tried the MalibuRacing web site? Lots of rear axle and brake swap info there.
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Old 06-24-2015, 03:28 PM
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Does summit or anyplace like that sell anything like that? There aren't any junk yards around my area.
I have tried malibu racing with little luck.
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