Hi Scotty, I've been watching your videos for a long time and hopefully I can see this question come through on one as this is kind of a weird question and I'd love to hear you explain it

I have a 2001 Dodge Ram 2500 4x4 with the Cummins Turbo Diesel engine and a hydroboost braking system. When the engine is running, the brake pedal takes around 4-5 seconds to fully come back up after being pressed. The power steering pump also hums loudly when pressing the brake and/or turning the wheel. My question is: how do I narrow down the problem to either be a faulty master cylinder or power steering pump? I have already replaced both front calipers, both rear wheel cylinders, and all of the brake lines and hoses.

Thanks and longtime fan,

Peanutbutter from Massachusetts