AIR BRAKES - GENERAL INFORMATIONCommon causes of torque imbalance or lack of com-bination unit performance include:1.Use of replacement parts, particularly linings,other. than those originally specified.2.Tractor and/or trailer brake torque output(s) notcompatible with the loads being carried..3.Lining contamination, poorly maintained brakes,and broken or malfunctioning brakecomponents.4.Brakes out of adjustmentThe trailer and/or tractor manufacturer should be con-sulted for any modifications to the respective trailer and/or tractor system that would cause deviation from theoriginal specificationGLOSSARY OF BRAKE TERMINOLOGYBRAKE ACTIVATION TIME:The length of time required for a given amount of air to start a mechanical movement in thebrake system foundation brakeCOEFFICIENT OF FRICTION: The amount of friction produced by any two bodies in contact with each other; the amountof force required to move one body while it remains in contact with anotherDECELERATION: The actual rate at which a moving body is losing speed; expressed by number of miles per hour or feetper secondDUAL BRAKE VALVE: An application valve (floor-mounted or suspended pedal type) having separate supply and deliverycircuits, providing the operator with a graduated control for applying and releasing a vehicle’s brakesINVERSION VALVE: Supplies a limited "hold-off" pressure to the spring brakes through use of the service brake valveKINETIC (MOTION) ENERGY TO HEAT ENERGY: Heat that is produced by friction during brake lining-rotor/drum contactwhile the vehicle is in motion (decelerating)MODULATED SPRING BRAKE CONTROL:Referring to the fact that spring brakes are applied with some degree ofcontrolREACTION TIME:The time required from the operator’s initial thought of stopping to the activation of the brake systemCTS-4154Y - Page 35
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