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Remanufactured; w/o Master Cylinder
  • 100% O.E. parts are installed on every unit for like-new performance and reliability.
  • All units are 100% vacuum tested to ensure reliable performance.
  • Exclusive rust-prohibitive finishing process extends unit life.
  • Master cylinder output rods are pre-adjusted (when included) for easier and faster installation.
  • New mounting nuts and washers ensure proper, hassle-free installation.

Symptoms of a Failing Power Brake Booster:

  • Stiff brake pedal that is extremely hard to push
  • Longer stopping distance
  • Engine stalls when brakes are applied

Prior to replacing your Power Brake Booster:

  • Ensure the Vacuum Hose is properly connected and not loose
  • Check the Vacuum Hose for a blockage or leak
  • Inspect the Check Valve for cracks, looseness or damage

Testing your Power Brake Booster:

  • With the engine off, pump the brakes 5-6 times
  • Turn the engine on while pushing down lightly on the brake pedal
  • If your brake booster is working, the pedal will sink down about
  • If your brake booster is not working, nothing will happen or the brake pedal will push back against your foot

Installation Instructions

Preventing Premature Failure of your Vacuum Booster (Gas Vehicles)

Frequently Asked Questions: Power Brake Boosters
Brake Booster Diaphragm StyleDual
Diaphragm Diameter (in)11.19
Diaphragm Diameter (mm)284.23
Master Cylinder IncludedNo
Master Cylinder Stud Thread SizeM10 x 1.5
Package ContentsInstruction Sheet
Product ConditionRemanufactured
Alternate/OEM Part Number(s): 4746379, 4746380

Warranty Information:
1 year / 18,000 miles
Warranty Details