1967+ Ford Disc/Drum Brake Pressure Differential Switch Kit


A Muscle Car Research Exclusive!

Muscle Car Research is proud to offer a rebuild kit for the 1967-up Ford brake pressure differential switch made by Weatherhead and used on several different Ford and Lincoln-Mercury vehicles. The switches that can be serviced include the following:

  • C7ZZ-2B257-A (engineering numbers C7ZA-2B257-A, -C)
  • C7ZZ-2B257-C (engineering number C7ZA-2B257-D)
  • C7OZ-2B257-C (engineering number C7OA-2B257-E)
  • C7TZ-2B257-E (engineering number C7TA-2B257-E)
  • C8OZ-2B257-A (engineering numbers C8OA-2B257-E1, -E2, -H1, -H2, -K, -K1, -K2, -M)
  • C8TZ-2B257-B (engineering number C8TA-2B257-N)
  • C8TZ-2B257-C (engineering number C8TA-2B257-R)
  • C8TZ-2B257-G (engineering number C8TA-2B257-S)
  • C8ZZ-2B257-B (engineering numbers C8ZA-2B257-F1, -F2, -H1, -H2, -K, -K1, -K2, -M)

Our kit contains all of the parts needed to rebuild your leaky switch and return it to "like new" operating condition, including:

  • X-rings
  • Copper crush washer

All of the rubber parts are molded from a 70 durometer ethylene propylene diene monomer (EPDM) rubber compound that is fully compatible with automobile brake fluid. All parts are made right here in the USA! Are you unsure if this kit is for you? These switches was originally used on the following Ford and Lincoln/Mercury vehicles:

  • 1967 Ford Galaxie
  • 1967 - 1969 Ford Fairlane
  • 1967 - 1969 Ford Torino
  • 1967 - 1969 Ford Mustang
  • 1967 - 1972 Ford F-100 Truck
  • 1968 - 1972 Ford F250/350 2WD Truck
  • 1967 - 1969 Mercury Cougar
  • 1967 - 1969 Mercury Comet
  • 1967 - 1969 Mercury Montego

The kit can be used to rebuild other switches of the same type if the areas where the replacement rings are used measure 7/32" in the small groove and 15/64" in the larger groove.

Complete rebuild instructions are available from the Muscle Car Research web site. Dealer inquiries are welcome - please contact us for pricing. Be sure to check out our Pressure Differential Switch Lock Tool that you can use to keep the piston centered when bleeding your brakes after rebuilding your switch!