Trans 305.485 HistoryHistory: Cr. Register, February, 1996, No. 482, eff. 3-1-96; am. (2) (a), renum. (2) (b) to (e) to be (2) (f), (g), (i) and (j), cr. (2) (b) to (e) and (h), Register, October, 1997, No. 502, eff. 11-1-97. Trans 305.49(1)(1) When a vehicle is equipped with an axle or axles that raises or lowers by means of air pressure, spring force or hydraulic pressure, the control valves shall be installed as follows: Trans 305.49(1)(a)(a) The control valve that regulates the amount of pressure shall be mounted outside of the driver’s compartment. Trans 305.49(1)(b)(b) The control valve that regulates the movement of the axle or axles so as to raise or lower the axle or axles may be in the driver’s compartment. Trans 305.49(2)(2) This section applies to vehicles manufactured commencing with the 1998 model year. Trans 305.49 HistoryHistory: Cr. Register, February, 1996, No. 482, eff. 3-1-96; am. (2), Register, October, 1997, No. 502, eff. 11-1-97. Trans 305.50Trans 305.50 Bed and body on trailers and semitrailers. The bed or body of a trailer or semitrailer may not contain holes, cracks or other openings which would allow the vehicle contents to drop, leak or spill upon the highway. Trans 305.50 HistoryHistory: Cr. Register, February, 1996, No. 482, eff. 3-1-96; am. Register, October, 1997, No. 502, eff. 11-1-97. Trans 305.51Trans 305.51 Brakes on heavy trucks, trailers and semitrailers. Trans 305.51(1)(1) The brake system on every heavy truck, trailer or semitrailer required by s. 347.35 (3), Stats., to have brakes shall be maintained in proper working condition and in conformity with this section. Trans 305.51(2)(2) Every heavy truck, semitrailer or trailer over 10,000 pounds gross weight and required to have brakes shall have braking ability on every wheel, except as exempted by s. Trans 327.03 (4) or other applicable law. Trans 305.51(3)(3) No person may operate any heavy truck, trailer or semitrailer upon a highway if: Trans 305.51(3)(b)(b) The brake lining, pads, drums or rotors on any wheel are worn below the manufacturer’s recommended minimum operating level; Trans 305.51(3)(d)(d) The cables are frayed or hoses are abraded, damaged, deteriorated or leaking; or Trans 305.51(3)(e)(e) There is visual evidence of leakage of grease, oil or brake fluid that may have contaminated the braking surface. Trans 305.51(4)(4) This section does not apply to any trailer or semi-trailer when its actual gross weight is less than 3,000 pounds, or to farm trailers. Trans 305.51 NoteNote: Ch. Trans 308 establishes requirements as to the design, type and performance standards of brakes required by s. 347.35 (3), Stats., on trailers and semitrailers. Section 347.36, Stats., also establishes minimum performance standards for brakes on combinations of vehicles. Trans 305.51 HistoryHistory: Cr. Register, February, 1996, No. 482, eff. 3-1-96; am. (1) to (3) (intro.), Register, October, 1997, No. 502, eff. 11-1-97.