Vacuum Booster Diagnosis - Brakes Fail to Release. GMC Truck Savana 1999

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Vacuum Booster Diagnosis - Brakes Fail to Release

Checks

Action

Inspect for the following conditions:

•	A blocked passage in the power piston

•	An air valve sticking shut

•	A broken piston return spring or air valve spring

Replace the vacuum booster. Refer to Power Vacuum Brake Booster Replacement .

Inspect for a tight brake pedal linkage.

Repair or replace any faulty component.

Inspect for malfunctioning stoplamp switch.

Repair or replace the stoplamp switch. Refer to Stop Lamp Switch Replacement .