Additional work carried out every 2 years (Mercedes-Benz Vito W639)

Replacing the brake fluid in the hydraulic drive of the brake system.

1. Mark the brake fluid level in the expansion tank (1) using the sticker strip (for example, electrical tape). If after replacing the brake fluid the fluid level in the expansion tank (1) is

above the previously noted level, there is a danger that during the work (for example when replacing brake pads) it will overflow and the liquid will leak out.

2. Pump out the brake fluid from the expansion tank (1) to a residual level of approximately 10 mm.



3. Connect the air bleeder (arrow)

Follow the instructions in the device's operating manual.

4. Set the automatic brake force regulator lever to the full load position.

5. Attach a hose from the brake fluid collection tank to the bleed valve (2),

6. While supplying air under pressure to the expansion tank, open the bleed valve.

Continue bleeding until new, clean fluid, free of air bubbles, flows out of the bleed valve. Then close the bleed valve.





7. After bleeding air from all branches of the brake system, bleed air from the hydraulic clutch drive, proceeding in the same way as when bleeding air from the brake system. The clutch bleed valve (3) is shown in the figure.