SAFARI

27 BRAKES WHEEL CYLINDER SERVICING OVERHAULINGTHEWHEEL CYLINDER Wheel cyl inder should be overhauled as per recommended service schedule. REMOVAL OF WHEEL CYLINDER (REAR) When removing or servicing wheel cylinders, it is necessary to drain the brake fluid from the system and remove the brake shoes. Attach a transparent (Vinyl) Fig. 28 bleed tube to the bleed screw, having first removed its rubber dust cover. Unscrew the bleed screw 1/2 to 3/4 turn and pump out the fluid into a suitable container by operating the brake pedal. Remove the bleed tube. Remove the brake shoes as explained under “Removal of Shoes”. Remove the adaptor from the feed port along with the gasket. Remove the wheel cylinder from the wheel cylinder mounting bolts and take out the wheel cylinder from the backplate. Fig. 29 DISMANTLING OF WHEEL CYLINDER (Fig.27) Clean the wheel cylinder externally. Remove the dust covers fitted on the wheel cylinder assembly and the bleed screw. Push out the pistons, and springs. Remove the seals from the pistons and clean all the parts thoroughly in fresh brake fluid or alcohol and place them on a clean sheet of paper. NEVER CLEAN THE WHEEL CYLINDERS OR INTERNAL PARTSWITH KEROSENE OR PETROL, AS IT WILL LEAD TO CONTAMINATION AND DAMAGING OF RUBBER PARTS. EXAMINATION OF WHEEL CYLINDER Examine the cylinder bore and pistons. If they are not scored, corroded or ridged and are smooth to touch, new seals can be fitted. If there is any doubt about the condition of the bore, a new wheel cylinder assembly must be installed. Fig. 28 Fig. 27 Wheel cylinder assembly 1. Dust cover 2. Piston 3. Seal 4. Spring 4 5 3 2 1 9 6 7 8 5. Bleed screw 6. Seal retaine 7. Adaptor 8. Gasket 9. Dust cap