43 BRAKES Fig. 47 5.4 Beyond Vacuum limit (Fig. 47) : As the pedal force becomes greater and the pressure in chambers 2 & 4 attains ful l atmospheric level, the pressure difference exer ted on the diaphragms reaches the maximum and a force beyond it will no longer work on the diaphragm. So any further loading the output rod is directly transmitted to the master cylinder without vacuum assistance.
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