Workhorse P32 Autopark problem
Jim in MA
when I shift into reverse, but the motorhome rolls when I shift into
drive. The mechanism appears to be a drum brake operated by a
hydraulic pump. Can the brake be adjusted? Anyone know what might be
wrong? I don't want to bring it to the workhorse service center, if
there is something simple I can fix.
Thanks,
Jim
custom-yac...@att.net
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Don
engages when you place it in park, not drive. Why would you put it in
drive if you want your parking brake to work?
Don
Steve Wolf
engages. If you go from drive to park it does not?
"Jim in MA" <custom-yac...@att.net> wrote in message
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Dan Lawyer
shift into reverse, you definitely have a problem with it.
Having just overhauled mine on a 94 P30 chassis, I am way too familiar with
it, to the point of nightmares. The hydraulic systems pulls a cable which
is routed to a lever assembly that pulls another separate cable going to the
drum brake on the back of the transmission, whenever the vehicle is put in
park, or the ignition is turned off (even out of park). When the ignition
is on, and the vehicle is taken out of park, the system releases the cable
allowing the driveshaft to turn depending on the transmission gear you are
in. The emergency foot brake cable is also routed to the same lever
assembly that the hydraulic cable goes to, so that either cable will pull
the drum brake on, locking the driveshaft.
All the cables have adjustments, as well as the drum brake star wheel
adjustment. The hydraulic cable adjustment on the P30 is where the cable
comes out of the hydraulic housing, the emergency brake adjustment is at the
far end of the cable where it attaches to the lever assembly.
There were two version of this setup from what I understand, the other one
was vacuum operated, instead of hydraulic.
I would not recommend messing with this system unless you are really into
playing mechanic. It's dangerous if you use your hydraulic jacks and raise
the RV to work on it, most systems will automatically lower as soon as you
take the vehicle out of gear, and it has to be out of gear in order to work
on the system and test it. You need to raise it, block it, and disable the
jack system.
I would think it would still be in warranty being a 2001 so I would let a
dealer look at it, but make sure they know what they are doing. It's
amazing how many dealers have never even seen this type of system.
Workhorse is not Chevy, in that they only sell parts to dealers, not
Saturday mechanics. The Chevy dealers in Austin won't even deal with them
anymore, because if they get a wrong part, they have to eat it, Workhorse
won't take it back.
Sorry, didn't mean to get so long winded......
Dan
"Jim in MA" <custom-yac...@att.net> wrote in message
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Jim in MA
the parking brake should stay engaged, even when you shift from park
to any other gear. When you push the switch in the brake releases. At
least it used to work that way.
--
Regards,
Jim
custom-yac...@att.net
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"Don" <rve...@mindspring.com> wrote in message
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Jim in MA
See my response to Don.
Thanks
Jim
custom-yac...@att.net
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"Steve Wolf" <w8...@apk.net> wrote in message
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CruzMastr
This is a fairly common problem with the autopark system. I had the same
thing happen on my '95 P30. The autopark engaged when the shifter was in
Reverse or Park. It seemed like the problem was aggravated when engine and
trans are hot (not overheated just hot). I was able to find a spot just out
of the reverse detent that was still in reverse and released the brake but
it was touchy. Basically I managed to avoid need for reverse as much as
possible until I drove 200 mi back to Chev dealer that works on mine. The
diagnosis was the switch was out of adjustment. As you surmised, it is a
brake on trans tailshaft that is held "open" by hydraulic pressure. If the
switch gets out of adjustment it can either not set or not release as the
case may be. There is no manual override, no other parking brake and there
is no park pawl in the trans According to GM, a MH is too heavy and will
break a conventional park pawl. GM has sent letters out in past years to
warn owners to have the thing checked at every chassis service - I now
specify it be checked every time. According to NHTSA reports some folks have
had the coach roll away when they thought it was in park and some have had
the brake lock up while driving but so far it's not the subject of a recall.
The owner's manual gives dire wanings about trying to work on the brake -
something to the effect that "if you try to take this thing apart the
springs in it will rip various parts off your body!". If it fails (locks)
the coach will have to be hauled on a flat bed or the driveshaft
disconnected since they can't be towed on the front wheels. Hope this isn't
too discouraging. I personally think it's a really poor design and an even
worse implementation but I still like my coach so will live with it until I
can replace it with a diesel pusher and whatever screwy designs and problems
I find with it.
CruzMastr
"Jim in MA" <custom-yac...@att.net> wrote in message
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Jim in MA
The Left hand shoe appears to be worn out. The cable pulls in to
the stop. Adjusting the cable might help, but I think that is
inappropriate. I have made an appointment for service. This system is
too complex for me to troubleshoot, especially without service
documentation.
Again, thanks for the heads up.
Regards,
Jim
custom-yac...@att.net
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"CruzMastr" <cruz...@hotmail.com> wrote in message
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