Document ID: chunk:federal_register_of_legislation:F2017L01554:body:0:p23
Version: federal_register_of_legislation:F2017L01554
Segment Type: other
Provision Reference: 
Character Range: 69418–72390

to a parking brake system, unless it is the secondary brake;

            (c) Drum brakes or fully enclosed disc brakes are exempt from this test unless ventilation or open inspection ports are present;

            (d) This test requires the vehicle to be fitted with instrumentation that gives a continuous recording of brake control force and vehicle deceleration.  The MFDD and the stopping distance measurements are not appropriate in this case.

       6.2. Vehicle condition:

        (a) The test is applicable to all vehicle categories;

            (b) Laden:

             For vehicles fitted with CBS and split service brake systems: the vehicle is tested in the lightly loaded condition in addition to the laden condition;

            (c) Engine disconnected;

            (d) Each brake is fitted with water spray equipment:

         (i) Disc brakes: Sketch of water spray equipment:

          The disc brake water spray equipment is installed as follows:

                     (a). Water is sprayed onto each brake with a flow rate of 15 litres/hr.  The water is equally distributed on each side of the rotor;

                     (b). If the surface of the rotor has any shielding, the spray is applied 45° prior to the shield;

                     (c). If it is not possible to locate the spray in the position shown on the sketch, or if the spray coincides with a brake ventilation hole or similar, the spray nozzle may be advanced by an additional 90° maximum from the edge of the pad, using the same radius;

         (ii) Drum brakes with ventilation and open inspection ports:

          The water spray equipment is installed as follows:

                     (a). Water is sprayed equally onto both sides of the drum brake assembly (on the stationary back plate and on the rotating drum) with a flow rate of 15 litres/hr;

                     (b). The spray nozzles are positioned two thirds of the distance from the outer circumference of the rotating drum to the wheel hub centre;

                     (c). The nozzle position is   15 from the edge of any opening in the drum back plate.

       6.3. Baseline test

       6.3.1. Test conditions and procedure:

            (a) The test in section 3. of this annex (dry stop test - single brake control actuated) is carried out for each brake system but with the brake control force that results in a vehicle deceleration of 2.5 – 3.0 m/s2, and the following is determined:

                (i) The average brake control force measured when the vehicle is travelling between 80 per cent and 10 per cent of the specified test speed;

                (ii) The average vehicle deceleration in the period 0.5 to 1.0 seconds after the point of actuation of the brake control;

                (iii) The maximum vehicle deceleration during the complete stop but excluding the final 0.5 seconds;

            (b) Conduct 3 baseline stops and average the values obtained in (i), (ii), and (iii).