Braking Moment Control Circuit

Irrespective, of the pressure in the tandem brake master cylinder. the hydraulic unit can change the fluid pressure for the brake calipers during regulation.

However, a pressure increase as compared with pressure Coming from the master cylinder is not possible.

Hydraulic Unit (Part 1 Of 2):

Hydraulic Unit (Part 2 Of 2):

The hydraulic unit comprises three fast-switching solenoid valves. Of these valves, one each is associated with the left-hand and right-hand front wheel brake and the third with the rear wheel brakes.

By activating the valves with varying voltages, the brake fluid pressure of the individual brake calipers can be:

increased = pressure build-up stage (no current)
hold = pressure holding stage (half max. current)
reduced = pressure reduction stage (max. current).