Suzuki Jimny Service Manual page 275

5-14 BRAKES
CHECK AIR TIGHTNESS UNDER LOAD
1) With engine running, depress brake pedal. Then stop engine
while holding brake pedal depressed.
H : Hold
2) Hold brake pedal depressed for 30 seconds. If pedal height
does not change, condition is good. But it isn't if pedal rises.
H : Hold
T : 30 seconds