During preventive inspections of the system, you should check for traces of brake fluid on the master cylinder (at the top of the clutch pedal) and the working cylinder (near the gearbox).
Clutch cylinders with traces of oil are leaky and need to be replaced. However, it is difficult to determine the source of these traces on the working cylinder without thoroughly cleaning the entire surrounding area.
To bleed, you will need a transparent hose about 1 m long. Bleeding of the clutch hydraulic drive should be carried out as follows (it is recommended to do the work with an assistant):
- place the free end of the hose on the bleed nipple of the working cylinder;
- then press the clutch pedal several times and, while holding the pedal, open the bleeder nipple to release the brake fluid along with the air bubbles, tighten the bleeder nipple bolt, etc. until the air bubbles disappear from the outgoing brake fluid;
- tighten the bleeder bolts on the slave cylinder, remove the hose;
- check the operation of the clutch drive and its tightness with the engine running and reverse gear engaged;
- add liquid to the tank up to the Max mark, but do not overfill, as it may leak out.
(Article was obtained from the portal: «www.MercedesMan.ru»)