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P30 Auto Park light flickers Steve 3-26-09  
I have a 1997 Safari Trek with P30. Bought my unit in 2003. About a year after I got it the AutoPark light starting to flicker and the pump motor would engage at the same time. Unit briefly locked up on me. I had the pump motor switch and the pressure switch on the actuator replaced. The light continues to flicker but have had no lockups since then. Had my mechanic check it out one more time and he could find no bad parts. He replaced all parts then put the old ones back on when the flickering did not stop. The light flickers on and off while in gear. On a warm day after driving about an hour, the light will go off. The flicker rate starts at about once a second. When it gets to about once every 3 second it usually goes off. When it flickers, you can feel/hear the pump come on. What now?

Thanks in advance, Steve
Re: P30 Auto Park light flickers Charles 3-31-09  
Steve,
I had the same problem on my 1997 Georgie Boy. Checked all tubing, etc. for leaks. Then I removed the pump assembly, removed the reservoir and cleaned out all the dirty fluid. Reinstalled and filled with fresh ATF fluid. After the clean fluid worked its way completely thru the system the pulsing stopped. The brake now works correctly.
May opinion of what was happening. I believe the contaminated (dirty) fluid was causing the solenoid valve to not seal and to leak fluid back into the reservoir. This caused the pressure to fall at the actuator and the pump switch actuated the pump to maintain pressure.
Hopes this helps.
Charles
Re: P30 Auto Park light flickers Yvon Brisebois 5-11-09  
Go to http://www.rvmechanic.com/current_category.2176/Forum.53029/forum_thread_full.html

for a substantive discussion about this parking brake. Also, go to Workhorse site (assuming you have a Chevy engine); you will find a manual about your chassis, in the PARTS MANUALS section(You will have to register to get the download).

You probably need a pressure valve still available through GM dealers or to clean the oil system.

The brake, which sits behind the transmission, must have oil pressure to release; it can be disabled; without oil pressure to release it in drive, it stays set and the RV won't move...
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