SAFARI

40 BRAKES Fig. 44 5. OPERATION: 5.1 Released or normal running position (Fig. 44) : When the brakes are released, the vacuumbrake valve is in released position. The valve body, operating rod sub-assembly, diaphragms and diaphragm discs are positioned towards the rear housing side due to the fitted load of diaphragm return spring. Both the vacuum valve (X) and air valve (Y) are in closed condition. Vacuum is applied to the vacuum brake valve, through the non-return valve in the front housing.Vacuum is communicated from chamber 1 to chamber 3 through the passage A and to chamber 4 through vacuum passage C. From chamber 4, vacuum is communicated to chamber 2 through the passage B. There is constant vacuum in all the 4 chambers, in the normal running condition. As the diaphragms and valve body are pushed towards rear housing by the diaphragm return spring, no force is transmitted to the master cylinder in this condition. TO VACUUM