Removal of air from the brake system

Bleeding is carried out after opening the hydraulic circuits of the brakes, and also whenever the brake pedal becomes "soft" and it is necessary to press it several times for the brakes to take effect.

Introductory remarks

The rear brake vents must not be unscrewed when the hydraulic accumulator is pressurized or when the brake pedal is depressed. The hydraulic brake feeds the rear brake circuit at a pressure of 18 MPa.

Before performing any action that may be accompanied by leakage of brake fluid, be sure to relieve the pressure in the accumulator by pressing the brake pedal hard about 20 times.

When servicing, adjusting and repairing the brakes, the ignition must not be turned on unless this is required by the service manual.

Use the brake fluid recommended by the vehicle manufacturer and pour it from original, freshly opened containers.

When removing air from the brakes, the required level of brake fluid in the reservoir should be maintained at all times.

Removing air from the front brake circuit

1. Put a transparent plastic tube on the front brake deaerator. Lower the other end of the tube into a transparent container filled with brake fluid.

2. Press the brake pedal. If it does not offer resistance, then you should press it until it begins to show significant resistance.

3. With the brake pedal depressed, loosen the deaerator. Hold the pedal as long as air bubbles are visible.

4. Screw in the deaerator and release the brake pedal.

5. Repeat the last two operations until the brake fluid begins to flow out of the tube without air bubbles.


6. In the same way, bleed air from the second front brake circuit.

Bleeding air from the rear brake circuit

1. Put a transparent tube made of artificial material on the rear brake deaerator. Lower the other end of the tube into a transparent container filled with brake fluid.

2. Press the brake pedal.

3. Loosen the deaerator.

4. Turn on the ignition. This will activate the hydraulic pump and brake fluid will begin to flow out of the tube. Wait until the emerging liquid contains no air bubbles.

5. Release the brake pedal and screw in the deaerator.

6. Switch off the ignition and wait until the hydraulic pump stops.

7. Repeat these steps to bleed air from the second rear brake circuit.