![]() ![]() ![]() Should begin gradual rise to normal operating range. Build the air pressure to governor cut-out (usually around 120–140 psi.) Know your vehicle’s requirements. Pressure should build from 50 – 90 pounds per square inch (psi) within 3 minutes. Pressure should come up to normal within seconds after the engine is started. For trailers only, if the yellow light on the left rear of the trailer stays on, the ABS is not working properly. If it stays on, the ABS is not working properly. The light on the dash should come on and then turn off. If equipped, check the anti-lock braking system (ABS) indicator lights.Start engine and listen for unusual noises.Put the gearshift in Neutral (or “Park” if automatic).Step 3: Start the Engine and Inspect the Inside the Cab Get in and Start the Engine ![]()
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