Fleet Management News & Business Info | Commercial Carrier Journal
Issue link: http://read.dmtmag.com/i/284466
64 COMMERCIAL CARRIER JOURNAL | APRIL 2014 2 0 1 4 O U T - O F - S E R V I C E C R I T E R I A 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 follow- ing defects: s !NY STEERINGAXLE BRAKE DEFECT LISTED IN NEXT SECTION s 7ONT ACTUATE EFFECTIVELY OR FRICTION MATERIAL WONT CON- TACT DRUMROTOR s !UDIBLE AIR LEAK DETECTED AT CHAMBER s -ISSING BRAKE ON ANY AXLE REQUIRED TO HAVE BRAKES Drum air brakes s "ROKEN OR MISSING BRAKE SHOE LINING RETURN SPRING SHOE OR CHAMBER ANCHOR PIN SPIDER CAM ROLLER CAMSHAFT PUSHROD YOKE CLEVIS PIN CLEVIS PIN RETAINER BRAKE ADJUSTER PARK- ing brake power spring or air CHAMBER MOUNTING BOLT s ,OOSE AIR CHAMBER SPIDER OR CAMSHAFT SUPPORT BRACKET s ,INING HAS CRACKVOID OBSERV- ABLE ON EDGE WIDER THAN INCH s 0ORTION OF LINING IS MISSING TO THE EXTENT THAT RIVETBOLT IS EXPOSED s ,INING HAS CRACK OBSERVABLE ON EDGE LONGER THAN INCH s ,OOSE LINING SEGMENT PERMITTING ABOUT bINCH MOVEMENT s %NTIRE SEGMENT OF LINING IS MISSING s %VIDENCE OF OIL GREASE OR brake fluid contamination of the friction surface of the brake drum and the brake FRICTION MATERIAL s ,INING THICKNESS LESS THAN INCH OR TO WEAR INDICATOR IF SO MARKED AT SHOE CENTER Air disc brakes s "ROKEN OR MISSING CALIPER BRAKE PAD PAD RETAINING COMPONENT PUSHROD YOKE CLEVIS PIN CLEVIS PIN RETAINER BRAKE ADJUSTER PARKING BRAKE power spring or chamber return spring air chamber MOUNTING BOLT s ,OOSE OR MISSING BRAKE CHAM- BER OR CALIPER MOUNTING BOLT s 2OTOR HAS EVIDENCE OF SEVERE rusting or metal-to-metal contact over the rotor friction SURFACE OR ON EITHER SIDE s %VIDENCE OF OIL OR GREASE contamination of the friction surface of the brake rotor and THE BRAKE FRICTION MATERIAL s "RAKE PAD THICKNESS IS LESS THAN INCH OR TO WEAR INDICATOR IF PAD IS SO MARKED Brake adjustment limits s 7ITH ENGINE OFF RESERVOIR AT NO MORE THAN TO PSI DUMP EXCESS PRESSURE AND BRAKES FULLY APPLIED PUSH ROD STROKE b INCH OR MORE BEYOND ADJUSTMENT LIMIT s #OUNTING AS ONE DEFECTIVE BRAKE TWO BRAKES HAVING A STROKE LESS THAN INCH BEYOND ADJUSTMENT LIMIT s #LAMPTYPE CHAMBER ADJUST- ment limit: n 4YPE bINCH /$ INCH STROKE n 4YPE bINCH /$ INCH STROKE n 4YPE bINCH /$ = 2-inch stroke n 4YPE INCH /$ bINCH STROKE s ,ONGSTROKE CLAMPTYPE CHAMBER ADJUSTMENT LIMIT n 4YPE bINCH /$ = 2-inch stroke n 4YPE bINCH /$ WITH LESS THAN INCH MAXI- mum stroke = 2-inch stroke n 4YPE bINCH /$ WITH INCH MAXIMUM STROKE bINCH STROKE n 4YPE bINCH /$ bINCH STROKE Note: Brakes found at the ad- justment limit are not defec- tive 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 s -ISSING OR BROKEN CALIPER PADRETAINING COMPONENT BRAKE PAD SHOE OR LINING s -OVEMENT OF THE CALIPER WITHIN THE ANCHOR PLATE IN THE DIRECTION OF WHEEL ROTATION EXCEEDS INCH s 2OTOR HAS EVIDENCE OF SEVERE rusting or metal-to-metal contact over the rotor friction SURFACE ON EITHER SIDE s %VIDENCE OF OIL GREASE OR brake fluid contamination of the friction surface of the brake rotor and the brake FRICTION MATERIAL s ,ININGPAD THICKNESS OF inch at the shoe center for DISC OR DRUM BRAKES Front steering axle brakes s !NY INOPERATIVE OR MISSING 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 s $EFECTS OF DRUM AIR BRAKES AIR DISC BRAKES AND HYDRAULIC brakes in the previous section APPLY TO FRONT STEERING AXLE BRAKES WITH ONE EXCEPTION n &OR DRUM BRAKES LINING with a thickness of less than b INCH FOR A SHOE WITH A CONTINUOUS STRIP OF LINING OR INCH FOR A SHOE WITH two lining blocks or to wear INDICATOR IF SO MARKED s -ISMATCHED AIR CHAMBER sizes for drum air brakes and AIR DISC BRAKES 4HIS EXCLUDES long-stroke air chamber versus regular-stroke air chamber; and for drum BRAKES DIFFERENCES IN DESIGN TYPE SUCH AS TYPE CLAMP VERSUS TYPE ROTOR CHAMBER A mismatch on an air disc VEHICLE OUT-OF-SERVICE CRITERIA 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. * 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. Total number of brakes required to be on a vehicle combination Total number of defective brakes necessary to place the vehicle or combination 0ut-of-Service 4 6 8 10 12 14 16 18 20 22 1 2 2 2 3 3 4 4 4 5 *