Brake Pedal Excessive Effort with Engine Off. Chevrolet Chevrolet C-Series Medium Duty Truck B7 1998

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Brake Pedal Excessive Effort with Engine Off

Brake Pedal Excessive Effort with Engine Off Brake Light On

Problem	Action
DEFINITION: Excessive pedal pressure is required to stop with the engine OFF and BRAKE lamp ON.
Low or no voltage exists at the Electrohydraulic (EH) pump motor connection of the wiring harness.	Inspect for an open circuit between the battery and the EH pump. Repair the circuit as necessary.
A loose, dirty, or disconnected connection exists between the EH pump motor lead wire and the wiring harness.	Clean and secure the connection.
A poor ground exists between the EH pump and the booster.	Repair the circuit as necessary.
The EH pump is not functioning.	Replace the pump. Refer to Electrohydraulic Pump Replacement .

Problem

Action

DEFINITION: Excessive pedal pressure is required to stop with the engine OFF and BRAKE lamp OFF.

The flow switch is malfunctioning.

Replace the flow switch. Refer to Fluid Flow Switch Replacement

Little or no voltage exists to the following locations:

•	The ignition side of the coil relay

•	The battery connection to the relay

•	The electrohydraulic terminal on the relay

Clean the connections or replace the relay.

An open condition exists in the ignition diode.

Replace the diode.