Zetor PROXIMA PLUS 90 2012, Operator'S Manual

Page: 179 / 212

178
ADJUSTMENTS
E758
1. BLEEDING OF THE MAIN BRAKE VALVE FOR TRAILERS
This operation should be carried out at 730±20 kPa in the system using the following
procedure:
1. Refill the missing volume of brake fluid in the expansion tank to the maximum level
2. Remove caps on bleeding screws (2) of the trailer control valve (1), located on the
right side of the tractor between the tank and rear axle shaft.
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. Release the bleeding screws max. by 1/4 of turn.
5. The bleeding procedure is the same as in Warning, see p. 188.
6. Tread on completely the pedal that is not blocked by the gauge and tighten the
bleeding screw.
7. Release the brake pedal and repeat the procedure until air bubbles stop escaping
from the hose.