I have a hissing noise coming from the hydraulic assist for the Master cylinder

  • 2003 DODGE RAM
  • 100,000 MILES

This is hissing noise. Dodge 2500 cummins manual trans 4x4. Noise is at master cylinder where it bolts to the assist from the power steering pump. When steering is wheel is moved the hissing stops or when the brake is applied. Is there a diaphragm in that valve that is serviceable or is that valve just bad and has to be replaced?

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have the same problem?
Wednesday, October 12th, 2011 AT 10:00 PM

1 Reply

  • 3,443 POSTS

The noise is from a bypass valve that is part of the integrated pump the pressurizes the power steering and brakes.
It is common to have some hissing noises.
However, there is so much inter locked between the 2 systems, I am providing you with information on diagnosing each, noises diagnostics, diagrams, general desrptions of how they function together and how to repair the rare cases where there is a problems with a hissing noise.

Let me know if you have any questions or need any more information.
I will reply ASAP as I check posts for replies often.

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Thursday, October 13th, 2011 AT 2:32 AM

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