brakeparkingbrakedtrucktestsheavy U.S.Department ofTransportation NationalHighway TrafficSafety Administration DOTHS809514October2002 ParkingBrakeTestsonAir-BrakedHeavyTruck andTractors-MinimumInitialServiceBrake Pressure ThisdocumentisavailabletothepublicfromtheNationalTechnicalInformationService,Springfield,VA22161. DISC...
8. Air brakes are really three different braking systems: service brake, parking brake and emergency brake. True False 9. The service brake applies and releases: The parking brake when you use the parking brake control. The brake when you use the brake pedal during normal driving. ...
Release the parking brake (push the yellow knob in) Time for one minute to make sure that you do not lose more than 2 psi of air pressure (Static Test) Apply pressure to the brake pedal and hold the pedal for 1 minute making sure that you lose no more than 3 psi of air pressure ...
When the parking brake switch is toggled on, air is evacuated from the air line and the parking brakes are applied; the low pressure switch is then open. When the air line is pressurized, the parking brake switch is not toggled on and the parking brakes are not applied, causing the low...
3.4 Parking Chamber Release—Compress power spring. 3.5 Full Stroke—Maximum stroke of a unit. 3.6 Rated Stroke—The minimum des ign stroke of a unit. 3.7 Service Brake Actuator—Air activated actuator for applying the foundation brake. 3.8 Parking Brake Actuator—Mechanically applied actuator for ...
1. SCOPE This SAE Recommended Practice provides procedures and methods for testing service, spring applied parking, and combination brake actuators with respect to durability, function, and environmental performance. A minimum of five test units designated A, B, C, D, and E are to be used to ...
When the parking brake switch is toggled on, air is evacuated from the air line and the parking brakes are applied; the low pressure switch is then open. When the air line is pressurized, the parking brake switch is not toggled on and the parking brakes are not applied, causing the low...
for SAE J1469, “Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers”. This revision reflects the revisions made in SAE J1469, namely to include the special needs of an actuator when mounted to a disc brake caliper. In addition, modifications were made to the parking ...
During the applied leak test. Shut off the motor, release the parking brake, hold your foot on the brake pedal for 1 minute and watch your air pressure gauge. If you lose more than 3 psi on a single vehicle or 4 psi on a combintion vehicle the air loss rate is too much. Question...
a呵呵,被玻璃割伤的。 Ha-ha, is cut by the glass. [translate] aok just minuts 好正义minuts [translate] aParking brake (emergency brake): spring energy, compressed air operating on rear wheels 停车制动(紧急制动器) : 春天能量,运行在后轮的压缩空气 [translate] ...