Brake release system for a vehicle comprising a parking brake

A brake release system for a vehicle comprising a parking brake which has a brake chamber and which is controllable by a driver by setting an electronic parking brake switch in an ON state to engage the parking brake or in an OFF state to release the parking brake, the brake release system comprising:

• an air distributor configured to receive and distribute pressurized air;
• a regular air supply passage configured to receive pressurized air from the air distributor and supply the pressurized air to the brake chamber for releasing the parking brake;
• an auxiliary air supply passage configured to receive pressurized air from the air distributor and supply the pressurized air to the brake chamber for releasing the parking brake, wherein the auxiliary air supply passage is configured to be used in case of failure of the regular air supply passage;
• a valve device provided in the auxiliary air supply passage, wherein the valve device has:
• a closed first state in which pressurized air is prevented from being supplied from the auxiliary air supply passage to the brake chamber through the valve device;
• and
• an open second state in which pressurized air is allowed to be supplied from the auxiliary air supply passage to the brake chamber through the valve device for releasing the parking brake;
• wherein the valve device is configured to receive a first signal indicative of loss of pressure in the regular air supply passage;
• wherein the valve device is further configured to receive a second signal indicative of the electronic parking brake switch being in the OFF state;
• and
• wherein upon receipt of both signals, the valve device is triggered to change from the closed first state to the open second state to allow pressurized air to pass to the brake chamber via the auxiliary air supply passage.