Hydraulic Brake Lining Wear Checking
s2 m 42.03.000
Before checking lining wear with the wheel removed, review the following brake lining exposure warning.
Warning: Breathing brake lining dust (asbestos or non-asbestos) could cause lung cancer or lung disease. Unless exposure can be reduced below legal limits, wear an air purifying respirator approved by MSHA or NIOSH at all times when servicing the brakes, starting with removal of the wheels and continuing through assembly.
- Chock the tires on the axle that isn't being worked on.
- Remove the wheel and tire assemblies from the axle that is not chocked.
- To minimize the possibility of creating airborne brake lining dust, clean the dust from the brake rotor, brake caliper, and brake assembly, using an industrial-type vacuum cleaner equipped with a high-efficiency filter system. Then, using a rag soaked in water and wrung until nearly dry, remove any remaining dust. Do not use compressed air or dry brushing to clean the brake assembly.
- Measure the thickness of the brake pads at each end of the raised axle. Replace all of the pads at both axle ends if any of the linings is worn to less than 3/16 inch (4.8 mm) at the thinnest point.
- Make sure that the brake rotor and linings are free of oil and grease.
- Install the wheel and tire assemblies, then repeat all of the above steps on the other axle.
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