Heavy Duty Trucking, September 2018

Youve got what it takes And so does an ODYSSEY battery Theyre engineered from inside out for long service and deep cycling to power on board accessories Like you ODYSSEY batteries are built for the long haul the www odysseybattery comLOWEROPERATINGCOST LOC 2018 EnerSys All rights reserved Trademarks and logos are the property of EnerSys and its affiliates unless otherwise noted Subject to revisions without prior notice E O E Regardless of which method you chose the resulting figure is Measurement 1 Now either raise or lower the trucks air pressure by either running the engine or pumping the brake pedal until you have 90 to 100 psi indicated in both the primary and secondary air tanks Once youve got the correct air pressure indicated apply and hold full pressure to the service brake pedal Next you need to determine the applied pushrod stroke according to the method you selected to obtain that measurement If you used Method 1 measure the distance from the mark you made on the pushrod to either the brake chamber or the fixed reference point If you used Method 2 measure the applied position of the pushrod In both cases your objective is to measure the distance from the previously selected point on the pushrod to the previously selected fixed point near the brake chamber to obtain Measurement 2 Now based on your previously determined size and type of brake chamber check Measurement 2 against the correct adjustment limit for the brake chamber If the applied pushrod stroke is longer than the adjustment limit the brake is out of adjustment Taking brake free stroke measurements If you need a general idea as to whether or not your brakes are adjusted correctly and dont have time to carry out a full formed inspection you can measure the free stroke of a brake which gets longer as the brake gets more and more out of adjustment In this approach properly chock and secure the vehicle then climb underneath it and using your hand or a suitable pry bar pull back on the pushbar away from the brake chamber and measure how much play is present in the pushbars range of motion If the measured free stroke distance exceeds inch 19mm there is a high likelihood the brake is out of adjustment In this instance CVSA dictates checking the applied stroke of the brake the right way to confirm correct adjustment Again the CVSA guidelines stress that this method only gives limited insight into brake adjustment and is not a guarantee that the brakes are within accepted CVSA adjustment limits Inspecting pushrod markings To help simplify the brake inspection process many brake manufacturers today mark pushrods with indicator markings that can quickly tell you if a brake is in or out of adjustment To check brakes using this method check to make sure the vehicle is properly secured and chocked then climb underneath and SEPTEMBER 2018 HDT 35 WWW TRUCKINGINFO COMinspect each brake pushrod A manufacturers out of adjustment indicator will typically be a brightly colored band around the pushbar If the brake is within adjustment this marking will be inside the body of the brake chamber and not visible However if any portion of the indicator marking is visible either flush with the brake chamber face or past it the brake is out of adjustment