CVSA

2012 OUT-OF-SERVICE CRITERIA VEHICLE OUT-OF- SERVICE CRITERIA BRAKES Defective brakes A vehicle or combina- tion vehicle is Out-of- Service if 20 percent or more of its service brakes have one of the following defects: • Any steering-axle brake defect listed in next section. • Audible air leak at chamber. • Evidence of oil, grease or brake fluid contam- ination of the friction surface of the brake drum and the brake friction material. lining is missing. • Won't actuate ef- fectively or friction material won't contact drum/rotor. • 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 missing, to the ex- tent that rivet/bolt is exposed. • Lining has crack, ob- servable on edge, lon- ger than 1-1/2 inch. • Lining thickness less than 1/4 inch or to wear indicator, if so marked, at shoe center. Air disc brakes • Broken or missing caliper, brake pad, pad retaining component, pushrod, yoke, clevis pin, brake adjuster, parking brake power spring or chamber re- turn spring air cham- ber mounting bolt. • Rotor has evidence of severe rusting or metal-to-metal contact over the rotor friction surface or on either side. • Counting as one defective brake, two brakes having a stroke less than 1/4 inch beyond adjustment limit. push rod stroke 1⁄4 inch or more beyond adjustment limit. • Clamp-type chamber adjustment limit: – Type 20 (6-25⁄32- inch O.D.) = 1-3/4- inch stroke – Type 30 (8-3⁄32- inch O.D.) = 2-inch stroke • Loose or missing brake chamber or cali- per mounting bolt. • Long-stroke, clamp- type chamber adjust- ment limit: – Type 20 (6-25⁄32- inch O.D.) = 2-inch stroke – Type 36 (9-inch O.D.) = 2-1⁄4-inch stroke • Evidence of oil or grease contamination of the friction surface of the brake rotor and the brake friction material. DEFECTIVE BRAKE CHART Must be used for vehicles with up to 20 brakes in determining when a vehi- cle/combination is to be placed Out-of-Service. Total number of brakes required to be on a vehicle combination – Type 24 (7-7⁄32-inch O.D.) = 1-3/4-inch stroke 10 12 14 16 18 20 22 4 6 8 * 1 2 2 2 3 3 4 4 4 5 Total number of defective brakes necessary to place the vehicle or combination 0ut-of-Service * For a vehicle of • Brake pad thickness is less than 1/16 inch or to wear indicator if pad is so marked. • Loose lining segment, permitting about 1⁄16- inch movement. • Entire segment of Brake adjustment limits • With engine off, reser- voir at no more than 90 to 100 psi (dump excess pressure) and brakes fully applied, – Type 24 (7-7⁄32-inch O.D.) with 3-inch maximum stroke = 2-1⁄2-inch stroke – Type 24 (7-7⁄32-inch O.D.) with less than 3-inch maximum stroke = 2-inch stroke Note: Brakes found at the adjustment limit are not defective for the purposes of the 20 percent rule. In calcu- lating the number of defective brakes, round all fractions down to the next whole number. – Type 30 (8-3⁄32-inch O.D.) = 2-1⁄2-inch stroke 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. Hydraulic and electric brakes • Missing or broken caliper, brake pad, shoe or lining. • Movement of the cali- per within the anchor plate, in the direction of wheel rotation, exceeds 1/8 inch. • Rotor has evidence of severe rusting or met- al-to-metal contact over the rotor friction surface on either side. • Evidence of oil, grease or brake fluid COMMERCIAL CARRIER JOURNAL

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