Power Steering Pump, Hydraulic Booster, or Master Cylinder??

[jacobilee1@aol.com]

I have a 1999 F250 super duty with a 7.3. I am having braking problems, when the truck is running, the brake pedal goes all the way to the floor and the power steering pump whines loudly. It pushes back a little bit but resistance is minimal. When the truck is off the brakes feel good and tight.
Already replaced a ruptured brake line, pads, and disks. I blead the system at each tire, but did not have any special tools to pressurize the system. Seems to be air free. My power steering fluid was a little low, but I did not find any sign of leakage and the steering seems to operate fine, except for being noisy (the same noise as when the brakes are applied). How can I tell if I need a new power steering pump, master cylinder, or Hyrdo pump?

[scraph]

My first inkling is master cylinder. If the master cylinder is leaking by then it is probably able to hold pressure without help of the brake booster (that is, it is able to hold the pressure of your foot only) but when you start the truck and the hydroboost kicks in, the master cylinder can't hold that much pressure and leaks by.

The power steering pump _might_ (or it could be the hydro pump that you hear) be whining louder because the leaking master cylinder is placing additional fluid demand on the system. I would start by replacing the master cylinder.

[mfdboy911]

Did you find the fix?

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