Document ID: chunk:federal_register_of_legislation:F2006L03060:body:0:p12
Version: federal_register_of_legislation:F2006L03060
Segment Type: other
Provision Reference: 
Character Range: 33238–36120

N in the case of a hand operated brake. The necessary longitudinal force will be considered to have been applied if the sum of the force applied to the trailer towing point and the force due to the effect of gravity on the laden trailer mass, in the direction parallel to the test surface and trailer longitudinal axis, is greater than 0.18 times the 'Aggregate Trailer Mass'. Where the test involves a force depending on the slope of the test surface, the slope shall not be less than 10 percent. When the test involves the action of slope on the trailer or combination mass, and the towing vehicle remains connected, 1.5 per cent of the towing vehicle mass shall be subtracted from the other forces parallel to the test plane, to allow for rolling friction.

The test slope shall be specified in terms of unit vertical per unit horizontal distance.

38.3.6.1.2.              The 'Parking Brake System 38/00' shall meet the requirements of clause 38.3.5.2 ('Emergency Brake System' performance) when the calculation of 'ERC' according to clause 38.3.3.2.5 is with an 'Aggregate Trailer Mass' instead of 'Total Trailer Axle Load' and the 'Foundation Brakes' geometry is such that a reversal of the required braking torque will not reduce the ability of the 'Parking Brake System 38/00' to generate the required braking torque.

38.3.7.                          Not used

38.3.8.                          Dynamometer Test Conditions

         38.3.8.0 Where dynamometer testing is used in lieu or in support of the requirements of the road testing required by clauses 38.3.2 to 38.3.7, the requirements of this clause shall apply.

38.3.8.1.                    The dynamometer inertia for each wheel shall not be less than that determined from the expression:

I = MR2

where:

I is the dynamometer inertia, in kg.m2

M is the mass supported by the wheel at the 'GALR in kg.

R is the 'Static Loaded Tyre Radius' of the tyre, as specified by the tyre manufacturer, in metres.

The ambient temperature shall be between 23.0 and 38.0oC

38.3.8.2.                    Ambient air shall be directed continuously over the brake drum or disc at a velocity of not more than 11.2 m/s.

38.3.8.3.                    The temperature of each brake shall be measured by a single plug-type thermocouple installed in the centre of the lining surface of the most heavily loaded shoe or pad. The thermocouple shall be outside any centre groove.

38.3.8.4.                    The rate of brake drum or disc rotation on a dynamometer corresponding to the rate of rotation on a vehicle at a given speed shall be calculated by assuming a tyre radius equal to the 'Static Loaded Tyre Radius' specified by the tyre manufacturer.

38.3.8.5.                    Burnishing, if conducted, shall consist of:

            (1) not more than 200 stops such that any instantaneous deceleration does