How to Replace a Brake Master Cylinder

Below guide will teach you How to Replace a Brake Master Cylinder . Please follow the instructions carefully.

Things You’ll Need:

  • Combination Wrench Set
  • Socket and Ratchet Set
  • 3/8 in. Drive Ratchet
  • Brake Fluid
  • Brake Master Cylinder

Estimated Costs:

  • DIY Costs: Est. $271.56 parts only
  • Shop Costs: Est. $472.25 parts and labor

Image may not be specific to your car.


  • Park the vehicle on a level surface and prop the hood up.
  • Find the position of the master cylinder and examine the level of the brake fluid.
  • Evacuate the brake fluid from the master cylinder with the help of turkey baster.
  • Making use of flare nut wrench, disconnect the brake lines from the brake master cylinder. Also detach electrical connectors from the master cylinder.
  • Remove the brake master cylinder from the brake booster by unbolting the bolts and replace it with new brake master cylinder.
  • Using recommended brake fluid for your vehicle, fill up both the chambers of brake master cylinder reservoir.
  • Thread the adapters into the brake master cylinder with the help of bench bleeding kit.
  • Guide the plastic tubing back into the master cylinder.
  • Pump the piston with full strokes. You may require Phillips Screwdriver to do this. You need to pump the brake master till all the air is evacuated.
  • Take the bench bleeding kit out and reconnect the brake lines. Add more brake fluid to the master cylinder.
  • Next, close the hood and raise vehicle with the help of floor jack.
  • To ensure your safety, prop the vehicle on the jack stands.
  • Unfasten the lug nuts holding the wheels and take the wheels away from the vehicle.
  • Support the brake pedal with 1 x 4 size wooden block so that it doesn’t move far.
  • On the passenger side, look for the brake bleeding valve somewhere around the brake caliper or wheel cylinder.
  • Fix a piece of clear plastic tubing to the brake bleeder screw and insert the other end of the tubing into the container filled with brake fluid.
  • Instruct your assistant to press down and hold the brake pedal.
  • Loosen the bleeder valve and let the fluid and air evacuate from the reservoir.
  • Retighten the brake bleeding valve screw.
  • Keep repeating the process till there are no air bubbles appear in the brake fluid.
  • Add more brake fluid to the master cylinder and make sure it is filled up to the required level.
  • You need to do the same, i.e. from step 16 to 21 on other wheels in the order of left rear wheel, right front wheel and left front wheel.
  • Once you have replaced the master cylinder for all the wheels, put the wheels back and secure them with lug nuts.
  • Take a small drive to make sure that everything is working well.

Further Reading

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