X-90 (2WD) L4-1591cc 1.6L SOHC MFI (1997)
Check Air Tightness Under Load
1) With engine running, depress brake pedal. Then stop engine while holding brake pedal depressed.
2) Hold brake pedal depressed for 30 seconds. If pedal height does not change, condition is good. But it isn't if pedal rises.