Document ID: chunk:federal_register_of_legislation:F2017C01153:front:0:p36
Version: federal_register_of_legislation:F2017C01153
Segment Type: other
Provision Reference: 
Character Range: 108051–110959

and

4.14.2                            independent brake tests must be performed in the case of vehicles where the front and rear brakes can be applied separately.

4.15                                  Tests With Brakes Subject to Wetting

4.15.1                            The tests must be carried out under the same conditions as the tests with dry brakes.  There must be no adjustment or alterations of the brake system other than fitting the equipment to allow brake wetting.  In the case of vehicles where the front and rear brakes can be applied separately, the brakes must be tested independently.

4.15.2                            The test equipment must continuously wet the brakes for each test run at a flow rate of 15 litres/hour for each brake.  Two disc brakes on one wheel will be considered as 2 brakes.

4.15.3                            For exposed or partly exposed disc brakes the prescribed amount of water must be directed onto the rotating disc in such a manner that it is equally distributed on the surface or surfaces of the disc swept by the friction pad or pads.

4.15.3.1                      For fully exposed disc brakes the water must be directed onto the surfaces(s) of the disc one-quarter of a revolution in advance of the friction pad(s).

4.15.3.2                      For partly exposed disc brakes the water must be directed onto the surface(s) of the disc one quarter of a revolution in advance of the shield or baffle.

4.15.3.3                      The water must be directed onto the surface(s) of the disc(s) in a continuous jet, in a direction perpendicular to the surface of the disc, from single jet nozzles so positioned as to be between the inner extremity and a point two-thirds of the distance from the outer extremity of that part of the disc swept by the friction pad(s) (see Figure 1).

4.15.4                            For fully enclosed disc brakes the water must be directed onto both sides of the shield or baffle at a point in a manner corresponding with that described in clauses 4.15.3.1 and 4.15.3.3.  Where the nozzle would be coincident with a ventilation or inspection port, the water must be applied one-quarter of a revolution in advance of the said port.

4.15.5                            Where in the preceding clauses 4.15.3 and 4.15.4 it is not possible to apply the water in the position specified owing to the presence of some fixed part of the vehicle, the water must be applied at the first point, exceeding one-quarter of a revolution, where uninterrupted application is possible.

4.15.6                            To ensure correct wetting of the brakes, the vehicle must be driven with the wetting equipment operating for a distance of not less than 1.0 km at the test initial vehicle speed prior to the application of the brakes being tested.

4.15.7                            For drum brakes the prescribed amount of water