This International Standard specifies the method of testing the hydraulic braking systems of vehicles of categories M and N which are built to comply with ECE-R 13/09, including supplements 1 to 7. The values in square brackets [ ] are taken from ECE Regulation No. 13 for information. Hydraulic braking systems include vacuum-assisted and power hydraulic-assisted braking systems as well as full power hydraulic braking systems. NOTE Test methods covering the Electrical Regenerative Braking Systems of Electrical and Hybrid Vehicles are not included in this edition. This omission may be corrected by a further annex once these vehicles are in more common use and suitable practical test methods have been developed.