OHS Code

Published Date: July 01, 2009
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Part 36 Mining

Section 581 Air brakes

An employer must ensure that if air or air-over-hydraulic brake systems are fitted to a rubber-tired, self-propelled machine,

(a) all non-braking secondary air circuits are supplied through check valves that isolate the secondary circuit involved if there is a sudden pressure drop in the main circuit,

(b) the total volume of air available in the main circuit for normal service brake application is not less than 12 times the total displacement volume of all brake actuators at full travel,

(c) a wet reservoir with an automatic water ejection valve or an air-drying system is fitted between the compressor and the first brake service reservoir,

(d) the machine has gauges that

(i) meet the requirements of

(A) SAE Standard J209 (2003), Instrument Face Design and Location for Construction and Industrial Equipment, or

(B) SAE Standard J209 JAN87, Instrument Face Design and Location for Construction and Industrial Equipment,

(ii) are visible to the operator, and

(iii) show the air pressure in the main and emergency air circuits and the brake application pressure,

(e) the machine has a visible or audible warning device that effectively alerts the operator when the air pressure in the main service brake circuit falls below a predetermined pressure, and

(f) check valves protect air reservoirs from loss of pressure if the supply side leaks.