BS ISO 20918:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 System threshold pressure recommendation
5 Apparatus
6 Procedure
  6.1 General
  6.2 Vehicle test for truck and semi-trailer tractor
  6.3 Vehicle test for trailer
Annex A (informative) - Report form for the roller brake
        test if printouts not available
Annex B (informative) - Examples of roller brake test
        printouts for the measurement of system
        threshold pressure
Bibliography

Specifies a method to evaluate the braking threshold of heavy commercial vehicle combinations with pneumatic braking systems, by means of a roller brake tester.

This International Standard describes a method to evaluate the braking threshold of heavy commercial vehicle combinations with pneumatic braking systems, by means of a roller brake tester.

This International Standard describes procedures for workshops and garages and provides

• a recommended pressure range of the system threshold pressure for motor vehicles and trailers, and

• a recommended practice for determining the system threshold pressure.

NOTE Motor vehicles and trailer combinations with conventional braking systems are covered by the procedures given in this International Standard. Motor vehicles with a conventional braking system coupled to an EBS equipped trailer can also be tested using the procedure given in this International Standard, as the pneumatic control line is used.

This International Standard covers neither high-pressure compatibility, including the control of the coefficient of friction between lining/pad and drum/disc, nor dynamic influences. This International Standard is not for use at Type Approval.