Document ID: chunk:federal_register_of_legislation:F2006L03061:body:0:p14
Version: federal_register_of_legislation:F2006L03061
Segment Type: other
Provision Reference: 
Character Range: 39238–42142

the energy storage device level if higher, at which the 'Emergency Brake System'
commences to activate the 'Brakes'.

38.3.6.                          Parking Brake Effectiveness

38.3.6.1.                    Each 'Unique' trailer 'Parking Brake System 38/00' shall be shown by either test in accordance with clause 38.3.2 (general test conditions) or by the calculation based on data for 'Approved' components in clause 38.4.4, to meet the requirements of clause 38.2.4.3 (parking brake effectiveness), and shall be deemed satisfactory if clause 38.3.6.1.1 or clause 38.3.6.1.2 is met.

38.3.6.1.1.              The 'Parking Brake System 38/00' shall be able to meet the requirements of clause 38.2.4.3 (18 percent gradient) for a 5 minute period in each direction with the force required to actuate the parking brake not exceeding 685 N in the case of a foot operated brake and not exceeding 590 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 percent 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