Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISBRAKESANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESBRAKE PRESSURE MODULATOR VALVE HYDRAULIC TESTINGDUMP AND ISOLATION VALVE TESTINGWHEEL ISOLATION TEST PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Wheel Isolation Test Procedure
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Wheel Isolation Test Procedure
- Apply the parking brake fully.
- Start the engine and allow the engine to idle.
- Select the desired Isolation Valve Solenoid Test on the scan tool.
- Apply the brake with very light pressure, only enough to open the brake switch.
- Command the solenoid ON and then immediately apply firm and steady pressure to the brake pedal.
- The electronic brake control module (EBCM) automatically de-energizes the solenoid after about 5 seconds. When this occurs, verify that the brake pedal drops about 2.2 cm (1 in).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.