Bleeding Of Pressure Air Brake System For Trailers; Bleeding Of Rear Wheel Brakes - Zetor Proxima GP Series Operator's Manual

1. Bleeding of pressure air brake system for trailers

Bleed he system at working air pressure 730 ± 20 kPa in the following way:
1. Add missing volume of brake fluid into the brake fluid tank up to the maximum level.
2. Remove the plugs of the vent screws (2) of trailer control valve (1) located at the right-hand side of the
tractor between the fuel tank and the rear half-axle.
3. Slide hoses on the screws and put the other hose ends at the bottom of a transparent tank (3) partially
filled with brake fluid. Place the tank minimum 300 mm above the vent screws. The screws must be
permanently under pressure to avoid aerating of the brake system through the screw threads.
4. Loosen the bleeding screws maximum by 1/4 turn.
5. Bleeding process is the same as mentioned in - Important (see page 178).
6. Fully depress the pedal that is not blocked by the gauge and tighten the adjusting screw.
7. Release the brake pedal and repeat the process, until air bubbles cease escaping from the hose.

2. Bleeding of rear wheel brakes

Bleed the system in the following way:
1. Check brake fluid level in the equalising tank. Add missing volume of brake fluid into the brake fluid tank
up to the maximum level.
2. After removing of the rubber cap, slide a hose on the vent screw (2) of the brake cylinder and put the hose
end at the bottom of a transparent tank (3) partially filled with brake fluid. The vent screw must be
permanently under pressure to avoid aerating of the brake system through the screw threads. Place the tank
minimum 300 mm above the vent screw at this operation.
3. Loosen the bleeding screws maximum by 1/4 turn.
4. Bleeding process is the same as mentioned in - Important (see page 178).
5. Fully depress the pedal that is not blocked by the gauge and tighten the adjusting screw.
6. Release the brake pedal and repeat the process, until air bubbles cease escaping from the hose.
ADJUSTMENTS
E758
E759
148