Health check
Disconnect the brake pipes from the master brake cylinder.
In place of the tubes, connect one pressure gauge to the inlet of the proportional valve, the second to the outlet.
Note. After installing the pressure gauges, bleed the brake system.
Depress the brake pedal and measure the current pressure at the inlet and outlet of the proportional valve. If the pressure value corresponds to that shown in Figure 6.40, then the valve is in good condition.
Reconnect the brake pipes, bleed the brake system.
Pic. 6.40. Proportional valve characteristic
Note. The characteristic of the proportional valve is given for the case of increasing pressure (pic. 6.40).
Installing the rear brake pressure regulator
Pic. 6.41. Master brake cylinder
Establish the main brake cylinder as it is shown in drawing 6.41.
Tighten the brake pipe nuts and bleed the brake system.
Brake pipe nut tightening torque: 13–17 Nm, proportional valve nuts: 35–55 Nm.