§ 1246. Brakes--School Buses and Farm Labor Vehicles.
13 CA ADC § 1246Barclays Official California Code of Regulations
13 CCR § 1246
§ 1246. Brakes--School Buses and Farm Labor Vehicles.
The following additional brake requirements shall apply to school buses and farm labor vehicles:
(a) Air Brakes--Type 1 school buses having 10 or more rows of seats and manufactured after January 1, 1970, and prior to April 1, 1977, shall be equipped with full compressed air brakes. Type 1 school buses equipped with air brakes and manufactured after January 1, 1953, shall have at least two reservoirs connected in series. On all school buses manufactured on or after July 1, 1970, the air-actuated devices outside the service and emergency brake systems shall also be provided with a reservoir equal to at least six times the total volume at full travel of all auxiliary devices supplied by the reservoir. The reservoir requirement for the air-actuated devices outside the service and emergency brake systems shall not apply to school buses manufactured on or after March 1, 1975, in compliance with FMVSS 121 (49 CFR 571.121).
(1) Air brakes shall have a buzzer or other audible warning signal and a visual, air-operated, flag-type warning device, both used exclusively for the brake system. Both devices shall give a continuous warning when the air supply pressure in the first reservoir to receive air from the compressor, or any service reservoir, drops below a fixed pressure as specified by Vehicle Code Section 26506. The flag-type device is not required on vehicles manufactured on or after March 1, 1975, in compliance with FMVSS 121 (49 CFR 571.121).
(2) Vacuum brakes shall have a buzzer or other audible warning signal and a visual, vacuum-operated, flag-type warning device, both used exclusively for the brake system. They shall provide continuous warning to the driver when the vacuum in the supply system drops to 8 inches of mercury and less. The requirement for the flag device shall not apply to vehicles manufactured with a dual or split type service brake system powered by power-assist vacuum chambers.
(5) The requirements in (1) and (2) for warning devices to be used exclusively for the brake system shall not be construed to prohibit multichannel warning devices that monitor other vehicle systems in addition to the brake system if such devices provide a clear brake system warning that cannot be activated by any of the other monitored vehicle systems.
(c) Brake System Modification--Brakes on Type 1 school buses may be modified only with the written approval of the school bus chassis manufacturer or by using brake system options of a type available from the bus manufacturer and represented by the bus manufacturer as suitable for use on the specific model school bus. Modifications shall not render the brake system in violation of the provisions of this title or of any other law or regulation. Modifications shall not render inoperative any item of brake-related equipment nor diminish any aspect of performance of a brake system manufactured in compliance with FMVSS 121, except as permitted by written ruling of the National Highway Traffic Safety Administration.
(2) A conversion from an air brake chamber that has an air applied parking brake or emergency stopping system function to a brake chamber that has a spring applied parking brake or emergency stopping system function, or vice versa, is not considered a modification if the conversion is made in accordance with the substitute component manufacturer's instructions.
(A) Air Brake System--At least half of the required air reservoir capacity shall be safeguarded to prevent the stored air from being depleted by any failure or leakage in the connection to the source of compressed air. Air supply for the service brakes shall be protected so that failure of the air-actuated devices outside the service brake system will not drop the service brake supply system pressure to less than 60 pounds per square inch.
(B) Vacuum Brake System--The required vacuum brake system reservoir capacity shall be safeguarded to prevent the stored vacuum from being depleted by any failure or leakage in its connection to the source of vacuum. The supply of vacuum for all devices or systems other than the brake system shall be drawn from between the brake system check valve and the source of vacuum.
(3) Failure or malfunction of any part in either the emergency stopping system or the service brake system shall not leave the vehicle without operative brakes capable of stopping the vehicle loaded up to the manufacturer's gross vehicle weight rating within the requirements of California Vehicle Code Section 26508(k)(3).
This provision does not apply to a failure in the mechanical parts of the wheel brake assemblies or the brake pedal and linkage to the brake valve or master cylinder.
Credits
Note: Authority cited: Sections 31401 and 34508, Vehicle Code. Reference: Sections 31401 and 34508, Vehicle Code.
History
1. Amendment of subsections (b)(2) and (d)(3)(A) filed 6-9-82; effective thirtieth day thereafter (Register 82, No. 24).
2. Amendment of subsection (b)(1) filed 4-16-86; effective thirtieth day thereafter (Register 86, No. 16).
3. Repealer and new section filed 5-14-92; operative 6-15-92 (Register 92, No. 20).
4. Editorial correction of printing error in subsection (e)(3) (Register 92, No. 29).
5. Change without regulatory effect amending subsection (d)(3)(B) and Note filed 5-11-95 pursuant to section 100, title 1, California Code of Regulations (Register 95, No. 19).
This database is current through 5/10/24 Register 2024, No. 19.
Cal. Admin. Code tit. 13, § 1246, 13 CA ADC § 1246
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