52 --- Brakes are spongy or ineffective - drum brakes
Worn brake linings. Determine lining wear using the external brake wear indicator on the brake back plate, or by removing the wheel and withdrawing the brake back plate. Renew the shoes as a pair if the linings are worn below the minimum thickness.
Worn brake camshaft. Wear between the camshaft and the bearing surface will reduce brake feel and reduce operating efficiency. Renewal of one or both items will be required to rectify the fault.
Worn brake cam and shoe ends. Renew the worn components.
Linings contaminated with dust or grease. Any accumulations of dust should be cleaned from the brake assembly and drum using a petrol dampened cloth. Do not blow or brush off the dust because it is asbestos based and thus harmful if inhaled. light contamination from grease can be removed from the surface of the brake linings using a solvent; attempts at removing heavier contamination are less likely to be successful because some of the lubricant will have been absorbed by the lining material which will severely reduce the braking performance.
Brake components not centralized on wheel. See Chapter 9 - Wheels & Brakes.
Angle between operating lever and brake rod incorrect. See Routine Maintenance - Major Service - 14.3 Check the drum rear brake.
© April 2014