ASTM E503/E503M-88(2000) - 10.7.2000
 
1. Scope

1.1 These test methods cover the measurement of skid resistance on paved surfaces with a passenger vehicle equipped with specified full-scale vehicle tires and using the diagonal braking mode. These test methods include the following:

1.1.1 Full-Stop Method --This represents the nonsteady-state skid resistance on two diagonally locked wheels, as the vehicle decelerates over a wetted pavement surface under specified limits of static wheel load and from a desired speed. The vehicle shall remain essentially parallel to its original direction of motion.

1.1.2 Pulse-Braking Method -The deceleration resulting from momentary diagonal wheel lockup (pulse braking) is measured. The vehicle decelerates over a wetted pavement surface under specified limits of static wheel load and at a desired speed. The vehicle shall remain essentially parallel to its original direction of motion.

1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents:therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

 
2. Referenced Documents

F457-04(2017)

Standard Test Method for Speed and Distance Calibration of Fifth Wheel Equipped With Either Analog or Digital Instrumentation

F403-98

Standard Test Method for Tires for Wet Traction in Straight-Ahead Braking, Using Highway Vehicles (Withdrawn 2007)

E178-21

Standard Practice for Dealing With Outlying Observations

E501-08(2020)

Standard Specification for Standard Rib Tire for Pavement Skid-Resistance Tests

E524-08(2020)

Standard Specification for Standard Smooth Tire for Pavement Skid-Resistance Tests