California Code of Regulations
Title 13 - Motor Vehicles
Division 2 - Department of the California Highway Patrol
Chapter 4 - Special Equipment
Article 12 - Brake Equipment
Section 1063 - Load-Controlled Air Pressure Reducing System

Universal Citation: 13 CA Code of Regs 1063

Current through Register 2024 Notice Reg. No. 38, September 20, 2024

(a) Systems that automatically reduce air pressure at brake actuators during brake application in proportion to the axle load shall operate as follows:

(1) When the single or tandem-axle load on the roadway is 85 percent or more of the maximum legal load or rated gross weight of the axle, whichever is lower, the device or system shall not reduce the full service brake air pressure at the brake chambers to less than that required by Vehicle Code Section 26502 unless the vehicle meets the requirements of Federal Motor Vehicle Safety Standard 121 (49 CFR 571.121) in effect at time of manufacture.

(2) The system shall incorporate a feature to override the automatic control, at the driver's discretion, to allow at least 90 percent of the air supply pressure at the foot valve to be applied to the brake actuators upon full brake application, except on axles designed to carry not more than 50 percent of the maximum legal load or gross weight rating of the axle and used in tandem with a maximum legal load carrying axle on the same vehicle.

(b) Systems that automatically reduce the application air pressure at brake actuators on truck tractors depending upon whether the semitrailer is connected or disconnected shall operate so the truck tractor meets the brake requirements of Federal Motor Vehicle Safety Standard 121.

1. Editorial correction adding NOTE filed 4-28-83 (Register 83, No. 18).
2. Amendment filed 8-31-83; effective thirtieth day thereafter (Register 83, No. 36).
3. Amendment of subsection (a)(1) filed 3-10-86; effective thirtieth day thereafter (Register 86, No. 11).

Note: Authority cited and Reference: Section 26502, Vehicle Code.

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