Proposal to clarify provisions concerning the use of Combined Braking Systems (CBS) and for a series of amendments to clarify a variety of requirements, notably concerning test surface requirements, ABS cycling, and peak braking coefficient measurements. The proposal clarifies the terms “inoperative” and “disconnected”, introduces the “K-method”.

Proposal to clarify the provision for permissible deactivation of ABS systems under the proposal to clarify the use of Combined Braking Systems (CBS) under GTR No. 3.