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Whining noise after hard braking and turning steering wheel

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I just started hearing a whining noise coming from the car which seems to get louder after hard braking or if I'm standing on an incline (at least this is what I think is happening). The whine is almost like a tranny whine that you hear on most manual cars going in reverse.

The pitch of the whine goes up and down as the revs on the car goes up and down. When the whine happens, I can feel a slight vibration on the brake pedal.

Any ideas on what this could be?

The car is a 2002 C2 Cab w/ 27k miles.

Edited by masq
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any tips on how to best diagnose a power steering leak on these cars? It feels like I need to re-educate myself on how to work on a car with a mid-engine setup.
Look for the leak!

There is a steering rack in the front of the car (and there are plastic belly pans that could hide the leak.

There are line that travel from the steering box (in the front) to the pump in rear of the car. And then there is the pump itself.

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