BRAKE CONTROL SYSTEM


  1. SYSTEM CONTROL


    1. When the driver depresses the brake pedal and brings the vehicle to a stop on a level road surface or gentle slope, the brake hold function maintains the wheel cylinder pressure of the 4 wheels, in order to keep the vehicle stationary. As a result, the vehicle will remain stationary even if the driver reduces the pressure on the brake pedal.

    2. While the brake hold function is operating, the skid control ECU illuminates the stop lights.

    3. When the driver starts the vehicle off, the system automatically releases the wheel cylinder pressure as the driver depresses the accelerator pedal.

      B002AQ7E01
      *1 Brake Hold Function Operating
      *2 Holds Wheel Cylinder Pressure
      *3 Brake Hold Function Not Operating
      *4 Creeps to Start Off

    4. Brake Hold Function Operating Condition


      1. The standby condition is necessary for brake hold operation. When the brake hold switch is pressed while all of the following conditions are met with the engine switch on (IG), the standby condition is met. When the standby condition is met, the brake hold indicator light (green indicator) illuminates.

        Conditions to Meet Standby Condition

        • Engine control system, ECT system, electric parking brake system and brake system are all operating normally.

        • Driver door is closed.

        • Driver seat belt is buckled.

      2. When the standby condition and all of the following conditions are met, the brake hold function operates. While brake hold is operating, the brake hold indicator light (yellow indicator) illuminates.

        Brake Hold Function Operation Conditions

        • The shift lever is in any position other than P or R.

        • The driver depresses the brake pedal and the vehicle is at a standstill.

        • The accelerator pedal is not depressed.

        • The vehicle is not on a steep slope.

        Tech Tips

        When brake hold cannot operate due to a steep slope, the brake hold indicator light (yellow indicator) stays off and a message is displayed on the multi-information display. Also, wheel cylinder hydraulic pressure is maintained for approximately 2 seconds after releasing the brake pedal to support starting off on uphill slopes.

      3. When any of the following conditions is met, brake hold ends while the brake hold indicator light (yellow indicator) turns off.

        Brake Hold Function Operation Ending Conditions

        • The driver depresses the accelerator pedal.

        • The driver moves the shift lever to P.

        • The driver depresses the brake pedal and moves the shift lever to R.

      4. If any one of the conditions listed below is established while the brake hold function is operating and the driver is not depressing the brake pedal, the electric parking brake will lock automatically. Therefore, cancel the parking brake by operating the electric parking brake switch assembly (manual switch), the shift lever or the accelerator pedal before starting off.

        Electric Parking Brake Operation Conditions

        • Driver door is open.

        • Driver seat belt is unbuckled.

        • 3 minutes have elapsed since the brake hold function operated.

      5. When any of the following conditions is met while the standby condition is met, the standby condition is canceled.

        Conditions to Cancel Standby Condition

        • The electric parking brake has locked automatically as a result of the driver seat belt being unbuckled or the driver door being opened.

        • Any one of the following takes place while the vehicle is being driven: the driver seat belt is unbuckled or the driver door is opened.

        • Driver presses the brake hold switch while the brake hold function is inoperative.

        • Driver presses the brake hold switch while depressing the brake pedal and the brake hold function is operating.

      6. When a malfunction occurs in any of the following systems, brake hold operation is prohibited. At this time, the brake hold indicator light (yellow indicator) flashes to inform the driver that the brake hold function cannot operate.

        Brake Hold Function Operation Prohibiting Conditions

        • Brake system and brake control system malfunctions*

        • Engine control system malfunction

        • ECT system malfunction

        • Electric parking brake system malfunction

        Tech Tips

        *: When the wheel cylinder pressure cannot be maintained while the brake hold function is operating, the electric parking brake system operates automatically to lock the parking brake. When starting off the vehicle, cancel the parking brake by operating the electric parking brake switch assembly (manual switch), the shift lever or the accelerator pedal before starting off.