Protege ES L4-1839cc 1.8L DOHC (1997)
Vacuum Brake Booster: Testing and Inspection
Vacuum Hose
1. Remove the clamps and the hose.
2. Apply both suction and pressure to the engine-side of the hose, and verify that airflows only toward that side. If air flows in both directions or not
at all, replace the vacuum hose.
