Hydraulic. (1) Buses using a vacuum in operation of the brake system shall be equipped with warning signals, readily audible and visible to the driver, which shall provide a continuous warning when the vacuum for braking is less than 8 inches of mercury. An illuminated gauge shall indicate to the driver the inches of mercury/vacuum available for operation of the brakes. (2) Vacuum assist brake systems shall have a reservoir used exclusively for brakes and shall be adequate to ensure loss in vacuum at full stroke application of not more than 30 percent, with the engine not running. The brake system on gas- powered engines shall include suitable and convenient connections for the installation of a separate vacuum reservoir. (3) The brake system dry reservoir shall be safeguarded by a check valve or equivalent device. In the event of failure or leakage in its connection to the source of compressed air or vacuum, the stored dry air or vacuum may not be depleted by leakage or failure. (4) Buses using a hydraulic assist booster in the operation of the brake system shall be equipped with warning signals, readily audible and visible to the driver, that shall provide continuous warning in event of a loss of fluid from the primary source or loss of electric power in the back-up system. (5) Brake lines, plus booster assist lines, shall be: (a) Protected from excessive heat and vibration; (b) Installed to prevent chafing, cutting, or stretching. (6) The parking brake system shall be designed and assembled to meet the following requirements: (a) The parking brake shall hold the vehicle stationary or to the limit of traction on braked wheels, on a 20 percent grade under any condition of legal loading on a surface free from snow, ice, or loose material; (b) When applied, the parking brake shall remain in the applied position with the capability as set forth in this regulation, despite exhaustion of the source of energy used for application or leakage; (c) The parking brake control mechanism:
Appears in 3 contracts
Sources: School Transportation Services Contract, School Transportation Services Contract, School Transportation Services Contract