Projects Drum/Drum vs Drum Disc master cylinder

Can a master cylinder set up for drum rear and disc fronts be used with a drum/drum system w no problems?

 

I just got off the phone w a buddy and he advised that I go with a 1967 Ford Fairlane or Maverick master cylinder as they are Drum/Drum type masters. Any opinions ?

 

Depends on if the disk-drum type has built-in residual valves. Jack E/NJ

 

Yes, with the addition of residual valves; 10 lb inline to the fronts, and internal or inline 10 lb to the rears.

 

You definitely want a dual master cylinder. If it is mounted on the firewall, no residual valves needed. If below the floor, 10 lb for the rear and 2 lb for the front. Most M/C come with 10 lb. in each outlet or none at all. If they are there, remove the front brake and replace it with a 2 lb. in line. There is no harm having residual valves with a fire wall mounted M/C, just not really necessary. Rear M/C port for front brakes and front port for rear brakes. Not a bad idea to install a proportioning valve in the rear line.
Warren

 

Not really. Remember it takes more volume of fluid to actuate drum wheel cylinders than disc brake pistons. Thus more fluid to a drum set up or larger master to rear, smaller to front.

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Actually both of the above are wrong, drums need residual valves regardless of position IF the wheel cylinders don’t have cup expanders built in, the reason for 10 lb residual valves is to prevent air in the wheel cylinder upon brake release. And it is totally false that drums use a greater volume of fluid, it pretty much acts as a solid when there is no air in the system, very little flow.


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