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CATEGORY LISTINGS > MAINTENANCE / SERVICE > gmc parking brake [ REFRESH ]
Thread Title:

gmc parking brake


Created On Saturday June 27, 2009 06:33 Diesel Talk
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lfmmechanial
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Posts: 8
Joined: Jan 2009

Note Saturday June 27, 2009 06:33 View thread in raw text format
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I have a 2000 6500 series GMC that came from a Penski rental fleet . The hydraulic park brake system cycles continuously while driving. There are no external leaks. The local dealers are not familiar with this system. Any help with wiring schematics system pressure or known problems?
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JoeZ
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Joined: Dec 2008

Note Saturday June 27, 2009 10:59 View thread in raw text format
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I'm a bit rusty on these....but I have worked on them before. If yours is like the others, the pressure keeps the brake from engaging. When the pressure drops slightly, the pump cycles on again until the pressure comes up. So.....either the valve is leaking, or the switch is giving it a signal to come on again. Some of the auto-brakes used the power steering pump pressure as well as an electric pump. As soon as the power steering pressure dropped slightly, the electric pump came on even if the pressure was high enough to keep the brake off. They were NEVER easy to fix. Good luck on that one.

-------------------------
One of the last 2 Stroke mechanics left.
44 years in the business and worked on everything from 53 series to 149 series. Winding it down now...time to move on.
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