Procedure for bleeding
WARNING: This page is about a different variant/trim than selected.
- Fill reservoir to its top edge with new brake fluid. Connect a bleeding device to the brake fluid reservoir. Switch on the bleeding device. Bleeding pressure is approx. 1.5 bar.
- Continue bleeding at the brake calipers. Do so in the following sequence: rear right/rear left/front right/front left. Open each bleeder valve until clear, bubble-free brake fluid emerges. It must be noted that bleeding takes place at both bleeder valves on each caliper. Bleed the outer bleeder valve first.
- Use a collecting bottle to make an accurate check on the escaping brake fluid for cleanliness, lack of air bubbles and to determine the brake fluid used.
- After installing a new brake master cylinder and/or a new hydraulic unit, do the following while bleeding: Open the right rear bleeder valves, then fully depress the brake pedal several times. Hold for 2 - 3 seconds after each depression, then release slowly. Repeat this procedure in the following sequence: rear left/front right/front left. This will remove all air bubbles (from the primary circuit).NOTE: Also carry out this procedure if the brake hydraulics were largely empty or if, after bleeding, residual aircan be detected by excessive brake-pedal travel. Please note: In vehicles with high mileage or in old vehicles, double the pumping cycles and use only half the brake master cylinder stroke (damage to the brake master cylinder/primary boots could occur).
- Switch off and disconnect the bleeding device. Correct the brake fluid level if necessary.
NOTE:
- On vehicles with Traction Control (TC) consisting of ASR and ABD (4-channel system), the ABD circuit (in the hydraulic control unit) must be additionally bled when the hydraulic control unit is replaced or removed (see following text).