CVSA

2013 OUT-OF-SERVICE CRITERIA VEHICLE OUT-OFSERVICE CRITERIA Brakes Defective brakes A vehicle or combination vehicle is Out-of-Service if 20 percent or more of its service brakes have one of the following defects: ��� ny steering-axle brake A defect listed in next section. ��� on���t actuate effectively W or friction material won���t contact drum/rotor. ��� udible air leak at chamA ber. ��� Missing brake on any axle required to have brakes. Drum air brakes ��� Broken or missing brake shoe, lining, return spring (shoe or chamber), anchor pin, spider, cam roller, camshaft, pushrod, yoke, clevis pin, brake adjuster, parking brake power spring or air chamber mounting bolt. ��� Loose air chamber, spider or camshaft support bracket. ��� Lining has crack/void, observable on edge, wider than 1/16 inch. ��� Portion of lining is miss ing, to the extent that rivet/ bolt is exposed. ��� Lining has crack, observ able on edge, longer than 1-1/2 inch. ��� Loose lining segment, permitting about 1���16-inch movement. ��� Entire segment of lining is missing. ��� Evidence of oil, grease or brake fluid contamination of the friction surface of the brake drum and the brake friction material. ��� ining thickness less than L 1/4 inch or to wear indicator, if so marked, at shoe center. Air disc brakes ��� roken or missing caliper, B brake pad, pad retaining component, pushrod, yoke, clevis pin, brake adjuster, parking brake power spring or chamber return spring air chamber mounting bolt. ��� oose or missing brake L chamber or caliper mounting bolt. ��� otor has evidence of R severe rusting or metalto-metal contact over the rotor friction surface or on either side. ��� vidence of oil or grease E contamination of the friction surface of the brake rotor and the brake friction material. ��� rake pad thickness is B less than 1/16 inch or to wear indicator if pad is so marked. Brake adjustment limits ��� ith engine off, reservoir W at no more than 90 to 100 psi (dump excess pressure) and brakes fully applied, push rod stroke 1���4 inch or more beyond adjustment limit. ��� ounting as one defective C brake, two brakes having a stroke less than 1/4 inch beyond adjustment limit. ��� lamp-type chamber C adjustment limit: ��� ype 20 (6-25���32-inch T O.D.) = 1-3/4-inch stroke ��� ype 24 (7-7���32-inch T DEFECTIVE BRAKE CHART O.D.) = 1-3/4-inch stroke ��� ype 30 (8-3���32-inch T O.D.) = 2-inch stroke ��� ype 36 (9-inch O.D.) = T 2-1���4-inch stroke ��� ong-stroke, clamp-type L chamber adjustment limit: ��� ype 20 (6-25���32-inch T O.D.) = 2-inch stroke ��� ype 24 (7-7���32-inch T O.D.) with less than 3-inch maximum stroke = 2-inch stroke ��� ype 24 (7-7���32-inch T O.D.) with 3-inch maximum stroke = 2-1���2-inch stroke ��� ype 30 (8-3���32-inch T O.D.) = 2-1���2-inch stroke Note: Brakes found at the adjustment limit are not defective for the purposes of the 20 percent rule. In calculating the number of defective brakes, round all fractions down to the next whole number. Hydraulic and electric brakes ��� issing or broken caliper, M brake pad, shoe or lining. ��� ovement of the caliper M within the anchor plate, in the direction of wheel rotation, exceeds 1/8 inch. ��� otor has evidence of R severe rusting or metalto-metal contact over the rotor friction surface on either side. ��� vidence of oil, grease or E brake fluid contamination of the friction surface of the brake rotor and the brake friction material. ��� ining/pad thickness of L 1/16 inch at the shoe center for disc or drum brakes. Must be used for vehicles with up to 20 brakes in determining when a vehicle/combination is to be placed Out-of-Service. Total number of brakes required to be on a vehicle combination 4 1 2 6 8 2 2 10 12 3 3 14 4 16 4 18 4 20 5 22* Total number of defective brakes necessary to place the vehicle or combination 0ut-of-Service * For a vehicle of combination that exceeds 22 brakes, determine the number of defective brakes by using 20 percent of the total number of brakes, rounding fractions up to the next whole number. Front steering axle brakes ��� ny inoperative or missing A brake on either wheel of any steering axle of any vehicle equipped or required to be equipped with steering axle brakes, including the dolly and front axle of a full trailer and tractors required to have steering axle brakes. ��� efects of drum air brakes, D air disc brakes and hydraulic brakes in the previous section apply to front commercial carrier journal | april 2013 3

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