BRAKE VACUUM PRESSURE SYSTEM



SYSTEM CONSTRUCTION DIAGRAM






Operation


The negative pressure in brake booster is measured by the brake booster vacuum sensor, and the electric brake vacuum pump is activated and deactivated as needed via the electric brake vacuum pump control relay. The PHEV-ECU performs this control.
note When the brake pedal is depressed repeatedly, the illumination of brake warning lamp and sounding of brake warning buzzer may occur, but it does not indicate a problem.