Power Steering Pump, Hydraulic Booster, or Master Cylinder?? - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 08-25-2010, 07:10 PM Thread Starter
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Question Power Steering Pump, Hydraulic Booster, or Master Cylinder??

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?
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post #2 of 4 Old 08-31-2010, 07:37 AM
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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.

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post #3 of 4 Old 09-13-2010, 12:46 AM
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Did you find the fix?
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post #4 of 4 Old 08-05-2011, 12:36 PM
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pressure booster pump

water pressure problem is really a bog problem .Total home water pressure booster pump is a solution for it.
It will increase the pressure and give better results so you can enjoy better
shower ana big cleaning and many more.It consume less power.
Its safe and easy to install and fully automatic that maximize and mainrain household water presure.
Maximum pumping capacity to 26 GPM ,Maximum additional pressure 40 PSI

Buy the PENTAIR WATER - FLOTEC- SIMER - 3075SS 3/4 HP water pressure booster pump at TheHardwareCity.com
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