1) Rest position

The piston has a groove which ensures that the inlet and outlet chambers are always in contact with the load proportioning valve.

1) Rest position

The spring pushes the piston downwards or against the wall of the outlet chamber.

2) Operating position

Up to an inlet pressure of 12 ± 2 bar for the 769 and 1000 versions and 17 ± 2 bar for the 4 x 4 version the outlet pressure corresponds to the inlet pressure.
The increase in the inlet pressure, acting on the surfaces of the piston, causes it to move downwards overcoming the action of the spring.
In these conditions there is an increase in the volume of the outlet chamber and a consequent decrease in the pressure in the rear circuit to the extent of 0.36 for the 769 and 1000 versions and 0.60 for the 4 x 4 version.

HANDBRAKE

NOTE Check the opposition of each components and the sliding of the inner cable in the outer cable. If there is any wear or seizing, replace the affected parts.

Handbrake adjustment

NOTE After carrying out the adjustment the handbrake level should not travel through more than 4 or 5 notches and the wheels should turn freely it is released.