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P30 auto park brake problems

Home > Discussion Forum > Mechanic's Corner - Brakes

Email Author email Myron Shipley  Reply to Message reply to message  Post New Message post new message      search forums
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P30 auto park brake problems Myron Shipley 5-18-06  
I have a 1997 Itasca on a 1996 Chevrolet chasis. Twice the auto brake failed. The first time about a year ago. It would not release. The tow truck driver found a blown 10A fuse under the dash. After replacing, the auto-park worked fine. The second time the auto brake engaged at highway speed and shelled the brake pads off the shoes. Again I found that same 10A fuse blown. After replacing the fuse, the brake mechanism was working but with all the damage to the brake shoes I still didn't a parking brake nor auto park. I have replaced the brake shoes and everything seems to be working correctly for the time being. This 10A fuse is not identified as to what it is protecting. It is in what appears to be and-on as it is housed in a add-on fuse block attached to the factory fuse block. I have owned the motorhome since it was new so I am sure it's been there since the motorhome was built. I would be very interested to find what this fuse controls so I could remedy the problem. Could you help? Thank you.
Re: P30 auto park brake problems Tom 10-24-06  
I am not an expert in this so please consider the source of this suggestion. That said, you might try a slightly larger fuse. It could be that you are right on the cusp of the current draw limit for the fuse you are using and if for instance you installed a 15 or 20 amp fuse the problem might go away. If you have a full short situation, it should still blow the fuse, so I don't think there is any risk of wiring damage by using the larger fuse. Start with the 15 and if that doesn't work, try the 20. If it is still blowing, then something somewhere is shorting it out. I wouldn't go any larger than the 20 amp. You could also try putting a current meter inline with the circuit and just see exactly what the current draw is. You can use a larger fuse if necessary just for the test. As these circuits get older, they will tend to draw more current than when they were new.
Re: P30 auto park brake problems rich 7-16-07  
If anyone has questions about Auto-Park system---just ask
rich
Re: P30 auto park brake problems Angela G. Smith 9-18-06  
Somewhere, somebody MUST be an expert in this field....after all, Chevy does pay engineers. We have a '95 Vectra on the '94-1/2 Chevy Chassis. When driving at highway-speeds, the autopark engaged and refused to release. We stopped & checked PSF and belt. Both OK so we decided to keep going.
I'm sure we glazed the linings on the parking brake, but we were only 30 miles from home with a sick child & took a chance. We can't find a chevy-dealer that is willing to even LOOK at the system. I was reading earlier posts concerning a 10A fuse, and also a possible adjustment area inside the left fender area. I've read the shop manual and the only solution it gives is replacement of the 4-way valve connected to the PS unit. This can't be the only answer...Any ideas?
Re: P30 auto park brake problems Chris 8-15-06  
I also have a problem with my auto park brake on my '96 National Dolphin; National are clueless and the chevy hotline is about as much use as a chocolate fireguard!
I am a mechanic by trade, (23 years exp) but all the chevy hotline could do was offer to send out a breakdown truck. When I asked would the breakdown guy have any knowledge of the system, I was told that he would just be a local truckrecovery unit - so no help there either. I have trid various dealers and none are willing to make a sugestion, none can fir me in for a couple of weeks or so. My light on the dash flickers constantly and the relay underneath clicks on and off in time to the light, but without some sort of clue, my 23 yeasr are wasted. I know either the pressure must be low or there is an electrical fault. The fluid level id=s plebnty high but it didn't stop my brake coming on on the top of an 11,000 ft pass. Overfilling the reservior and letting the system cool down seemed to help i.e. I could drive on without the brake on, but it still tries to come on at every opportunity. Perhaps chevy, and certainly National, don't care if we all die crashing off the high passes.
Sorry if this sounds like a moan but where I come from, (The UK) this would never happen; the manufacturer would be straight on the case. Unfortunately I have had other problems with my RV and no-one cares a damn - I was even told by National, that RVs are disposable products!!! I'm disgusted with the whole set up!
Chris B.
Re: P30 auto park brake problems Sonny 10-9-08  
2000 damon daybreak
auto park break light stays on everything seems to work ok but light stays on all the time
Re: P30 auto park brake problems Marshall McIntyre 7-14-06  
I continue to have Auto-park problems with my Rexhall Aerbus 1997. It has caused me nightmares and almost got me killed, as I cannot backup after the engine gets worm. It will work fine when cold.

Can't get any help form Chevy.
Winnebego Adventure P30 auto park brake stuck Jeff 8-8-07  
Hi I'm stuck in West Yellowston. The hydrolic fluid leaked out of the auto park engager. It is undernieth the RV just back past the trnsmission in the center. You will see a hydrolic cable looks like a black pipe going back that way. The little tank for the fluid holds less than a quart it's in the back of the metal holder protector peice. Put hydrolic fluid in there not brake fluid you should start going. The dany auto park light still stays on what a joke. That pisses me off having the brake automatically come on and off with the engine and putting it in park. I want to change it to manual and just disable the auto park system and make it only come on when I pull the parking brake and go off when I turn it off vs. being tied to some automatic system that sucks. I feel better hope that helps you I just paid 110.00 for some mechanic to bring me a quart of hydolic fluid fro the shop you can buy them for around $5.
Re: P30 auto park brake problems Charlie 2-8-08  
I have a 1997 Holiday Rambler 32 foot HM with chevy 454 cid engine. Auto park light was blinking while driving, but now aput park will not hold MH.
This all happened after unit was towed with drive shaft removed.
Re: P30 auto park brake problems John Lukas 9-26-08  
Auto brake lite stays on,when I shift out of park brake releases ok, but pump cycles every minute or so. any answers?
Re: P30 auto park brake problems Bill 10-3-08  
I have a similar problem to what most of you have. Hard to shift into gear.
Does not lockup transmission in park position. Auto-park light is on all the time after ignition switch is on.
Parking brake does not work. Will roll when not on level ground unless foot is on brake pedal.
Re: P30 auto park brake problems nap alves 8-10-08  
I FIXED MY P/30 E-BRAKE THANK'S TO RICHARD.HE GAVE ME STEP BY STEP INSTRUTIONS AND PART NUMBERS AND EVERYTHING WORKED OUT.I LEARNED A LOT ABOUT THIS SYSTEM AND I WILL PASS ON THIS INFO TO ANYONE WHO WANTS OR NEEDS IT.
[ RELIEVED] NAP
Re: P30 auto park brake problems J.I.M. 8-7-08  
I have a 1996 Doplphin RV with Chev P-30 chassis. AutoPark system works ok when cold but will engage when gear selector is in R when hot. This prevents backing up the vehicle. Very inconvieniant! So far it has not happened when moving forward. I see lots of posts with the problem but no solutions. Any solutions would be appreciated.
Re: P30 auto park brake problems Bob Scott 5-20-08  
Some, but few mechanics have been able to deal with this problem!

I have a 1992 Coachmen Motorhome on a GM Forward Control Chassis (‘91). It has a problematic hydraulic system. "Autopark" ties together the Brakes, Emergency Brake, Park & Power Steering. I've spent over $4000 in the last year and it's not fixed yet!

Chassis = M-340 MB Chev

VIN 1GBKP37N4M3315805.

Here’s something I found that I found interesting posted on
08-11-02, 07:27 PM on Doityouself.com:

“Need Moderator with special expertise. I have a motorhome on a Chev P-30 chassis which has a special "auto apply" parking brake system. An expert in this field will know what I am refering to. The brake is held OFF with hydralic presssure and is automatically activated by a heavy spring when the gear shift lever is moved out of park. Also has yellow knob to pull in order to activate the brake when the shift lever is out of park and in one of the gears. System was malfunctioning, took to Chev service center. Replaced hydra pump and high pressure switch. System still not working and has since locked up. Oh yes, the brake is a drum type which locks up on the drive shaft. Anyone having ANY knowledge of the system and how to fix it would be greatly appreciated. Still under warranty but Chev tech support not any smarter than the service center which is very willing to keep on replacing parts. (no cost to me, except very inconvient.) Thanks”.
Re: P30 auto park brake problems Douglas LeBlanc 4-22-08  
Why does the autopark brake effect the regular braking system? I thought it only effected the emergency brake!
Re: P30 auto park brake problems RILEY 6-11-08  
CUSTOMER HAS 95 WINNABAGO ON P30 CHASSIS
AUTO BRAKES WORK FINE COLD. WHEN HOT IT APPLIES IN REVERSE AND PARK. WILL WORK AGIN WHEN COOLED OF. HELP
Re: P30 auto park brake problems judd 8-26-08  
Where can i get a pressure switch for my park brake pump assembly
Re: P30 auto park brake problems Charlie 11-16-07  
I have a 1998 Winnebago vectra, the auto brake system locked up, I removed the brake shoes, to get home. After removing the shoes the trans will not hold in the PARK position..I don't under stand the connection between the parking brake and the trans...How can I get the trans to hold in the PARK position? Or can this be done with the parking brake disabled?

Thanks for any Help,
Charlie
Re: P30 auto park brake problems Jeff 7-20-07  
I have 1998 Georgia Boy cruisemaster. Where do I find the fuse for the auto-brake system. None of the fuses I've seen are labeled "Auto-Brake".

Jeff
Re: P30 auto park brake problems Ben Oliver 9-9-08  
Hello I have been spending lots of money on parts and still have no parking brake and i also now need some other part like a hydo-accilarator bake i just had the pump replaced whole system cleaned I have a 1992 chevy 34.5 foot class A motorhome and tired of no parking brake and also no power stering. what can I do thanks Ben
Re: P30 auto park brake problems patrick schlunz 5-18-08  
I have a 1998 pace arrow vision. i have 2 brake problems. #1 auto brake light comes on for no reason at all. when driving in the mountains the brakes work fine and all of a sudden i have no pedal at all. after 2 to 3 hours the brakes start working again. i have adjusted the parking brake & it seems to work fine. i do not know why the autu brake light comes on while normal driving conditions, or why the brakes fail after sevsera hours of driving. these problems have caused extensive damag to my motor home. if this is a manufacturers defect i would like to know so i can persue legal action.
Re: P30 auto park brake problems jason mcmann 4-22-08  
Emergency brake system

need wiring schmatics for the pump relay and how does it work it is its own assembly its not controlled with
the power steering pump
Re: P30 auto park brake problems Dale Johnston 6-6-08  
Recently purchased 1998 Fleetwood pace arrow motor home on Chev 454 chassis.
1) When placed in park it will roll on an incline.I do hear something operating underneath when placing the tranny selector from Drive to Park position.
2) Yellow parking brake control at the dash does nothing. Will not hold the vehicle either.
3) Are these integrated? How is this system suppose to work properly? What repairs are needed?
Thanks
Phone collect if preferred 506-734-3281.
Re: P30 auto park brake problems John Face 7-16-08  
My 1998 Airstream Land Yacht has auto park brake problem. Will not work. The resevoir that holds fluid for it leaks when I ad to it. Please advise.

Thanks

John Face
Re: P30 auto park brake problems Stewart Charkosky 6-25-08  
My auto brake does not engage and the shift lever in park does not hold I need help. New to rving thanks
Re: P30 auto park brake problems Rob Burnett 8-18-08  
Hi Rich;
I have a 95 Vectra on a 94 1/2 Chevy P30 chassis. Autopark engages when I shift to Reverse if the system is hot. It works fine when cold. The Chevy dealer that fixed it the last time when it locked up entirely, doesn't seem to have a solution this latest problem.
Can you help?
Thanks
Rob
Re: P30 auto park brake problems Nap 8-2-08  
Hi Stewart,

I have the same exact problem you discribe. I would appreciate any help you can give me.
thank you, Nap
Re: P30 auto park brake problems Tom Snider 9-8-08  
Got a lockup on my auto park brake (a 95 model winnebag adventure)I have been all over the thing and I havent figured a way to release the brakes so I can move it.
The rig is in the path of the current huricane in the area "IKE"
The last storm brought water up to the tires and if this one is any stronger I will be in trouble. I have read not to tow It with brake prblems.
the unit cranks and runs good, it just wont move.
I need help please,Quick.
Thanks,
T
Re: P30 auto park brake problems Rob Burnett 8-28-08  
Hi
I have had a lot of trouble with Autopark. The latest is that when the system is not (after driving for a while) when I shift to revers, the Autopark engages. Do you have a fix for this problem?
Thanks in advance for any help you can offer.
Rob
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