How to Bleed an ABS System

Anti-lock brake systems (ABS) are hydraulic pressure systems used in vehicles provide even braking pressure. When air bubbles form within a vehicles ABS, however, braking reliability is reduced. Unlike brake fluid, air is compressible, which can cause the system to underperform. When this occurs, the vehicles ABS must be bled to preserve operational integrity.

Instructions

How to Bleed an ABS System

1

Park the vehicle on a level surface and engage the parking brake.

2

Jack up one of the rear wheels. Using the lug wrench on the tire iron, remove the wheel that is off of the ground.

3

Open the hood and locate the brake fluid reservoir. Fill the reservoir with fluid, and replace the cap.

4

Locate the bleeder valve. Depending on the make of the vehicle, the valve may be on the caliper or wheel cylinder.

5

Place a small plastic hose on the bleeder valve. Place the other end of the hose into the plastic container. Fill the container with around two inches of brake fluid, to prevent air from re-entering the ABS while you are bleeding the line.

6

Ask an assistant to sit in the drivers seat. Instruct them to depress the brake pedal. Turn the bleeder valve a quarter of a turn. When the fluid stops flowing from the line, close the valve and instruct them to let pressure off of the pedal.

7

Repeat this process until clean fluid flows. Periodically the brake fluid level in the reservoir, ensuring that some remains at all times.

8

Repeat this process with the other rear bleeder valve, followed by the two front valves.

Related Posts by Categories