How to Replace a Master Cylinder

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The brake master cylinder is a key component of a vehicle's brake system. If this component fails, then your vehicle's braking ability will be weakened or destroyed. To avoid this safety hazard, it is best to replace the brake master cylinder. The following is a guide on how to replace a brake master cylinder.

Steps

1. 1
   Locate the various components of the vehicle's brake system.

   
   

   • Use your vehicle's manual to identify these components.
   • Locate the brake fluid reservoir, the brake master cylinder, the brake fluid level sensor, and the brake fluid lines.
   • The brake fluid reservoir is usually at the top of the brake system and contains brake fluid. It can be identified by the presence of a twistable cap on top of it.
   • The brake master cylinder is typically located directly beneath the brake fluid reservoir.
2. 2
   Remove the brake fluid from the brake fluid reservoir.
   • Remove the cap.
   • Use a siphon or turkey baster to remove the brake fluid.
   • Dispose of or recycle the brake fluid in accordance with local laws and regulations. Contact your local agency that deals with household hazardous wastes for any needed information.
3. 3
   Remove the brake fluid sensor connector.
   • This is part of the brake fluid level sensor that you previously identified from your vehicle's manual.
   • This can often be removed by pulling it with your hand.
   • Follow the instructions in your vehicle's manual.
4. 4
   Remove the brake fluid lines.
   • Loosen the brake fluid lines with a line wrench.
   • Twist the line wrench in a counter-clockwise motion on each brake fluid line until all of them have been removed.
   • Keep a towel or cloth handy to clean up any brake fluid that leaks as a result of this procedure.
5. 5
   Detach the brake master cylinder.
   • Use a socket wrench to remove the mounting bolts from the brake master cylinder. These bolts can be located in your vehicle's manual.
   • Remove the brake master cylinder by hand.
6. 6
   Install the new brake master cylinder.
   • Put the new brake master cylinder in place of the old cylinder.
   • Connect the mounting bolts with a socket wrench.
   • Reconnect the brake fluid lines by turning a line wrench clockwise.
   • Reconnect the brake fluid sensor according to the instructions in the vehicle's manual.
7. 7
   Fill the brake fluid reservoir with new brake fluid.
   • Use the type of brake fluid that is listed on the cap or in your vehicle's manual.
8. 8
   Bleed the new brake master cylinder.
   • Purchase a bleeder kit from an automotive supply store.
   • Follow the directions that come with the kit.

   
   

Tips

• If you are uncertain as to whether or not the brake master cylinder must be replaced, check it for fluid leaks. A fluid leak indicates that it must be replaced immediately.
• A low brake pedal indicates a potential problem with the brake master cylinder. If you push the pedal and it goes further to the floor than usual, inspect the brake master cylinder for damage immediately before driving again.

Warnings

• If you opt to take the vehicle to an auto mechanic instead of fixing it yourself, exercise caution by driving slowly and allowing plenty of room between your vehicle and other vehicles. Have the vehicle towed if the vehicle's braking ability has been severely reduced or if it no longer works at all.

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