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Message: <blockquote data-quote="Bobcatdan" data-source="post: 63554" data-attributes="member: 7339"><p>The brakes have charge pressure going to them, spec is 390 to 430 psi. If one side is releasing, you know that is all good. My guess is the brake seal blew out. The brakes are spring applied, hydraulic release. Also, if the brake is leaking bad enough, it will cause a system drop and can affect other functions. Charge pressure is the base pressure for everything. I don't know where you tested 960 psi, that is insano high. I'm think with that kind of pressure, you are wrecking stuff. The charge pressure releif vavle needs to be adgusted. Did you ever have any low charge preasure codes before replacing the pump, those really don't go bad. The easy way to test the brake is hook a porta power with a gauge to the brake. This can be done under the cab by the brake vavle, pump it up and see if holds pressure.</p></blockquote><p></p>