How to Use a Bleeder Wrench to Bleed Automotive Brakes

Modern cars use a hydraulic brake system. The hydraulic brake system relies on fluid solely—-no air. Brake fluid is fluid that no matter how high the pressure, it cannot be compressed any more. Air allowed into the hydraulic system lessens the boiling point of the fluid.

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• Box wrench
• Clear tube
• Bottle or canister
• Hammer
• Penetrating oil

1. Support the car with jack stands and blocks or use a car lift for maximum safety. Take all four tires off the car.

2. Purchase two cans of fresh brake fluid. A closed can of brake fluid has a very long shelf life. Never use open cans.

3. Suck the brake fluid out of the holding tank with a turkey baster. There will be sediment at the bottom of the reservoir.

4. Fill the reservoir with new brake fluid when it gets to be half-empty while bleeding the brakes.

5. Select a box wrench that will fit the bleeder bolt. A crescent or Vise-grip wrench will not work.

6. Tap the bolts with a hammer and apply oil to the bolts to loosen any corrosion.

7. Turn the bleeder wrench and loosen the bottles. Place a clear tube over the bolt and let the brake fluid drain into a bottle or canister.

Tips & Warnings

• Bleeding brakes is easier if you have an assistant.
• Do not turn the bleeder bolt more than 1/4 inch or the brake fluid will gush out and make a huge mess.
• Use only DOT 3 or DOT 4 brake fluid.
• Do not mix brands of fluid.
• Wear safety glasses and gloves.