SAFARI

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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