MR2 L4-132 2164cc 2.2L DOHC (5S-FE) (1993)
Vacuum Brake Booster: Component Tests and General Diagnostics
Air Tightness Check
Fig. 3 Air Tightness Check
1.
Start engine and stop after one or two minutes.
2.
Depress brake pedal several times slowly. If pedal drops the most on the first time, but gradually rises after the second or third time, booster is air
tight, Fig. 3.
3.
Depress brake pedal with engine running, then while depressing brake pedal stop engine. If there is no change in pedal reserve travel after holding
pedal for 30 seconds, the booster is air tight.
Operating Check
Fig. 5 Booster Operating Check
1.
Depress brake pedal several times with engine stopped, and ensure that pedal reserve distance has no change, Fig. 2.
2.
Depress brake pedal and start engine. If pedal drops slightly, operation is normal.