Document ID: chunk:federal_register_of_legislation:F2025C00108:reg:4:p15
Version: federal_register_of_legislation:F2025C00108
Segment Type: reg
Provision Reference: reg 4 (pt 15/25)
Character Range: 127444–130369

shall be warmed up to temperatures within the required 66 °C to 204 °C range by subjecting the vehicle to a number of sequential brake applications.
     3.                            If the temperature of any brake exceeds 204 °C during J-Turn testing, a cool down period shall be observed until the temperature of each individual brake is within the required 66 °C to 204 °C range.
     4.                            If the temperature of any individual brake falls below 66 °C during J-Turn testing, a series of sequential brake applications shall be conducted until the temperature of each individual brake is within the required 66 °C to 204 °C range.
     5.                            Except as provided in clause 5.5.1 below, individual brake temperatures must be measured by a plug-type thermocouple installed at approximately 1.0 mm depth in the approximate centre of the facing length and width of the most heavily loaded shoe or disc pad of each brake.  A second thermocouple may be installed at the beginning of the test sequence if the lining wear is expected to reach a point causing the first thermocouple to contact the rubbing surface of a drum or rotor.  This second thermocouple should be installed at a depth of approximately 2.0 mm and located within 25.4 mm circumferentially of the thermocouple installed at 1.0 mm depth. For centre‑grooved shoes or pads, the thermocouples should be installed within 3.2 mm to 6.4 mm of the groove and as close to the centre of the facing length as possible.
         1.                     A different method may be used to measure the individual brake temperatures, if it can be shown to be sufficiently accurate, for the purposes of this annex, in determining the temperature at the approximate centre of the facing length and width of the most heavily loaded shoe or disc pad of each brake.

 2.                                  J-Turn test procedures
The vehicle must be subjected to multiple series of tests using the 'J‑Turn Test Course'.  The vehicle travels through the course by driving down the entrance lane, crossing the start gate at the designated entrance speed, turning through the curved lane section, and crossing the end gate, while the driver attempts to keep all of the wheels of the vehicle within the lane.
 1.                            Reference Speed tests
The vehicle must be subjected to a series of J-Turn tests to determine the Reference Speed for each steering direction.  The Reference Speed is used in the Engine Torque Reduction Tests, and the Directional Control and Roll‑over Control Tests.
 1.                     Preliminary Reference Speed determination
     1.                 The vehicle must be subjected to two series of tests using the 'J-Turn Test Course' at increasing 'Entrance Speeds'.  One series must be conducted using clockwise steering, and the other series anti‑clockwise steering.
     2.                 During