At the service station, the system is pumped under pressure with a special device. When performing work independently, it is necessary to carry out them especially carefully. Under no circumstances should you drive a vehicle with defective brakes.
Before starting work, remove dirt from all bleed fittings and from the reservoir lid. If preliminary work was carried out on only one caliper, it will be sufficient to bleed only the affected brake circuit, i.e. rear and front mechanisms. The general bleeding procedure recommended by the manufacturer is: rear right wheel, front left, rear left, front right. Bleeding the brakes is carried out in the following order:
- put one end of the transparent hose on the bleeder valve, removing the plug from it. Lower the other end of the hose into a glass container with a small amount of brake fluid;
![](https://www.mercedesman.ru/img/another/0364.jpg)
Pic. 301. Bleeding the brakes
- the assistant should several times press the brake pedal to the stop and hold it. Loosen the screw by half a turn (pic. 301), and the pedal will move down a little. Visually check the brake fluid leaking through the hose;
- if it no longer contains air bubbles, stop pumping. The last time you press the pedal, hold it down, then tighten the union bolt. Then slowly release the pedal.
Similarly, carry out the operation on all bleed fittings.
Attention! During pumping, it is necessary to monitor the fluid level in the reservoir to prevent air from entering the system. Never fill the reservoir with brake fluid that has leaked out during bleeding. Do not use liquid that has been stored for a long time in an open container.