Diesel Bombers - Brake Hiss

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- - Brake Hiss (https://www.dieselbombers.com/5-9-liter-cr-dodge-cummins-03-07/75168-brake-hiss.html)

jsmith89

04-24-2011 09:49 AM

Brake Hiss

My '03 cummins makes a weird hissing sound whenever I really stand on the brake (usually when I'm trying to get my wallet out) As soon as I let off the brake it stops. Sounds like it is coming from under the dash. Any ideas what it might be and is that normal?

tiremann9669

04-24-2011 07:41 PM

My guess is a leak in the booster :c:

dangerous1965

04-25-2011 03:38 AM

Low fluid The hydroboost works off the P.S. pump.

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