Residual Check Valve Square Style - 10 lbs. (Drum Brakes)

Residual Check Valve Square Style - 10 lbs. (Drum Brakes)

$17.50
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Key features
  • Maintains 10 PSI of residual pressure at the rear drum brakes after the pedal is released
  • Lets you run a disc-brake master cylinder with rear drum brakes still installed
  • Square-style valve with 3/8-24 fitting installs inline between master cylinder and drum brakes
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Description

This 10 PSI residual check valve installs inline between the master cylinder and drum brake wheel cylinders to maintain 10 PSI of residual pressure after the brake pedal is released, allowing a disc brake master cylinder to be used with rear drum brakes. This lets you upgrade to a disc/disc master cylinder now and upgrade the rear brakes to disc later.

What's Included:

  • Square-style residual check valve, 10 PSI, 3/8"-24 fitting size
Fitment

1964 Ford Mustang, 1965 Ford Mustang, 1966 Ford Mustang, 1967 Ford Mustang, 1968 Ford Mustang, 1969 Ford Mustang, 1970 Ford Mustang, 1971 Ford Mustang, 1972 Ford Mustang, 1973 Ford Mustang, 1967 Mercury Cougar, 1968 Mercury Cougar, 1969 Mercury Cougar, and 1970 Mercury Cougar

Questions & Answers
Q: Do I need this valve if I'm running a disc/drum brake combination?

Yes, generally. Disc brake master cylinders typically don't have a built-in residual valve, but rear drum brakes need about 10 PSI held in the line to keep the shoes close to the drums, otherwise you get a long, spongy pedal. This inline valve adds that 10 PSI of residual pressure between the master cylinder and the rear drum wheel cylinders.

Q: Where does it go relative to a proportioning valve?

It should be installed after the proportioning valve, in the line that feeds only the rear drum brakes, so it doesn't affect front disc pressure.

Q: What if I upgrade to rear disc brakes later?

Rear disc brakes don't need this residual pressure, so plan to remove this valve from the rear circuit if you convert the rear to disc.