166
ADJUSTMENTS
E760 E761
3. BLEEDING OF THE BRAKE
SYSTEM OF FRONT DRIVING AXLE
Before bleeding procedure it is always
necessary to carry out bleeding of the
trailer control valve, as described in par.
1. Bleeding of air brake system for
trailers, even in case that air brakes are
not mounted for the trailer.
Carry out bleeding at operating air pres-
sure 730 ± 20 kPa in the system.
Carry out bleeding as follows:
1. Check level of brake fluid in the expansion tank. Refill missing volume to the
maximum if necessary.
2. Remove plastic caps of bleeding screws on brakes of the front driving axle (the
screws are located on upper surfaces of the reducers).
3. Slide hoses onto the screws and sink their other ends to the bottom of a transpar-
ent container (3), filled partly with brake fluid. Put the container at least 300mm
above the bleeding screws. The screws shall be still under pressure to prevent
penetration of air into the system through their threads.
4. Bleed left and right brakes simultaneously.
5. Release the bleeding screws max. by 1/4 of turn.
6. Tread on coupled brake pedals up to their stop and tighten the bleeding screws.
7. Release the brake pedals and repeat the procedure until air bubbles stop escap-
ing from the hose.
8. After bleeding of the brake system of the front driving axle tighten the bleeding
screws by a torque 0.8 to 1.2 Nm (3).
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