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 TESTINGBRAKE PRESSURE APPLICATION TESTING (W/JL4)NOTES
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Brake Pressure Application Testing (W/JL4): Notes
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Notes
IMPORTANT:
Before performing the following tests, perform all of the isolation valve tests described in the wheel isolation test procedure. A malfunctioning isolation valve may cause pressure to be applied to multiple wheels, instead of to just one wheel as commanded.
If the brake being tested fails to apply, does not hold for the full 9 second period, or releases slowly after the 9 second hold, the TC Isolation Valve Test has failed.
If the brake being tested fails to apply, does not hold for the full 9 second period, or releases slowly after the 9 second hold, the TC Isolation Valve Test has failed.
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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.