OAR 437-007-1035: Log Truck and Trailer Brakes

(1) Truck and trailer brakes must be tested before moving any load. (2) Brake slack adjusters must be adjusted to meet DOT specifications. (3) Vehicles with defective brakes must not be operated. (4) Brake drums must not be welded. (5) Engine-type brakes must be considered auxiliary controls, not a substitute for the primary braking systems. (6) Air or vacuum brake lines and fittings must be approved for brake line systems and not be interchangeable with water or other lines. (7) Splices in air brake lines must: (a) Be made with fittings approved for air brake line service. (b) Not restrict air flow below the minimum required for the line size. (8) If disconnected trailers are not equipped with effective brakes, wheels must be chocked, blocked or the trailer must be otherwise secured.