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Parking Brakes, also known as emergency brakes (e-brakes) mechanically apply the brakes to hold the vehicle stationary while it is parked. The parking brake is operated by a hand lever or by the brake pedal.

  • The parking brake hand lever or foot pedal has a ratchet or latching arrangement that keeps its position in place when the parking brake is applied. When  a release button is pushed on the hand lever or when a brake release handle for the foot pedal is pulled, the parking brake releases
  • Some foot pedals automatically release when the engine is running and the transmission is shifted away from park or neutral; which send intake manifold vacuum to a motor which enables to release the parking brake
  • Whenever the ignition key is on, the instrumentation cluster monitor panel indicator for the brake warning light turns on if the parking brake is applied. The warning lamp also illuminates if the parking brake is not fully released.

Pressure Differential Valve

  • The pressure-differential valve operates the instrumental warning lamp and if a section of the hydraulic system loses pressure. The pressure loss on a part of the piston makes is to move towards the side with the lowest pressure. which raises the plunger and closes the switch, then turns on the light