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BRAKE ASSIST CONTROL OPERATION

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• The DSC HU/CM uses the built-in brake fluid pressure sensor to monitor the rate at which the master cylinder pressure changes, and it initiates brake assist when it determines, from the pressure change, that emergency braking is occurring.
• The DSC HU/CM calculates the wheel cylinder pressure, increases fluid pressure in the master cylinder above the specified amount and, due to the change in master cylinder pressure, wheel cylinder pressure can be increased.
• In addition to normal brake fluid pressure, as each solenoid valve is switched, the pump motor is operated to pump fluid from the reservoir which increases brake pressure force in the wheel cylinders.
• Break assist is initiated at speeds of 17 km/h {10.6 mph} or above, and is inhibited at speeds of 5 km/h {3.1 mph} or below.

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1 | Normal brake mode
2 | Brake assist reduction
3 | Master cylinder
4 | Stability control solenoid valve
5 | Pressure-retention solenoid valve
6 | Traction switching valve
7 | Caliper piston
8 | Pressure-reduction solenoid valve
9 | Pump motor
10 | Pump