Swift L4-1298cc 1.3L SOHC MFI (1997)
REFERENCE
Should any of the vacuum related parts in the booster be faulty, the brake force is not increased. Even then, however, the brake depressing force is
transmitted to the valve operating rod, booster air valve, valve stopper key and booster piston in that order, to push the master cylinder push rod.
Thus, the braking operation itself will not fail.