Disc Brake Master Cylinder With Drum Brakes?

Dana67Dart said
Ohyyyy!

People,

  1. The man has 4 wheel drum brakes now
  2. He is NOT changing to front disc for a while
  3. In the mean time he wants to put the disc / drum master cyl and assorted distro block / proportioning valve on the car
  4. He would have residual valve on the rear drum brakes
  5. He would NOT have a residual valve for his front DRUM brakes.
  6. He would have a proportioning valve to the rear drums.
His question is:

Will this work for now? ( And be safe)
Click to expand...

The disk/drum M/C definitely won’t have a residual valve for the chamber intended for the disk front brakes.

But, it may not have a residual valve for the rear drums either. Like @Professor Fate said, at some point “somebody” decided the residual valves weren’t really necessary even for drums, so, a lot of re-popped and remanufactured M/C’s don’t have them regardless.

The larger chamber size for the front won’t be an issue, and combination valve shouldn’t be an issue either. The residual valve(s) probably won’t be.

If you do find that the rear brakes actuate faster than the fronts because of a residual valve going to the rear, you can add a residual valve into the front line. You’d want a 10psi residual valve for drums.

Wilwood Disc Brakes 260-13784 Wilwood Residual Pressure Valves | Summit Racing

Just remember to remove it when you add the front disks