518 / 1526
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 full
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.