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Old 04-16-2008, 08:05 PM   #1
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1989 34.5' Airstream 345
Silverton , Colorado
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'89 345 LE-parking brake won't release

Hello.
Got a fellow 345-er who has a parking brake that is stuck on...have tried rocking back and forth, tried it in neutral, and it won't release...seems like the cable is stuck somewhere, but don't know for sure...anyone out there have a similar problem occur(and a likely solution)? Anybody out there have a solution?...thanks
mike
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Old 04-16-2008, 08:08 PM   #2
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I have forgotten what year GM went to the parking brake/park gear that used a hydraulically released set of brake shoes. If this is the case, the usual problem seems to be a bad pressure switch, which leaks all the hydraulic fluid out, and engages the parking brake.
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Old 04-16-2008, 08:35 PM   #3
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Michael,

If the problem is not what Terry suggested then you might try disconnecting the brake cable at the drum (if thats even possible) and see if the brake releases. Definitely a weird problem.

Keep us posted when you finally get it resolved.

Good luck!

Brad
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Old 04-16-2008, 09:00 PM   #4
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I would get under there and bang on it with a hammer...really I would...even though its not a Ford.

Of course using all of the required OSHA approved safety equipment and procedures, like enging off, in park, chocked wheels.
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Old 04-16-2008, 09:07 PM   #5
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1994 36' Classic 36
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electronic switch

Problem is electronic switch at bottom of steering column. When your shifter engages switch, send signal to electric park brake to release. It may be fuse or something preventing signal. Point is that hittin with hammer wil not fix it. Releasing spring actuator to brake lever under coach is recipe for disaster. The actuator is under much spring pressure. Search this on google under GM C30 chassis park brake is stuck. Plenty of info on it. I have been there.
My problem was the switch assembly at bottom of steering column had come loose and was not positioning correctly.
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Old 04-16-2008, 09:15 PM   #6
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My '89 does not have electric release
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Old 04-16-2008, 11:23 PM   #7
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1989 34.5' Airstream 345
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Thanks for all the input, folks...the problem was tempoarily resolved by losening the cable stop assembly(located on the driver's side, near the tranny...). I'll print out a copy of this thread and give it to the owner and the guys working on the problem.

After the first hour of struggle, I actually DID say that this was when I usually brought out the hammer...
will let you know if resolution is reached
mike
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Old 04-17-2008, 08:20 AM   #8
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The emergency foot actuated brake is merely mechanical over ride for park brake. The brake is actually on the drive line and is electronically actuated when in "park" You can hear the pump when MH is moved to and from park or "P"
If the Park brake is stuck, the emrgency brake is stuck.

Read here;
P30 auto park brake problems
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Old 04-17-2008, 08:24 AM   #9
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Read here:
'89 345 LE-parking brake won't release

Not auto-park
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Old 04-17-2008, 09:10 AM   #10
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Possibly the hydraulic brakes are staying engaged.

Check out this thread -

http://www.airforums.com/forums/f159...-up-14245.html



One important after sight that was not listed in this thread was that I did indeed have another "episode" of brake lock following the final Master Cylinder installation.

There is a vertical linkage from the foot pedal assembly to the hydroboost actuator. There is a nut on the bottom of this assembly - I "adjusted" the actuator rod with about 1 1/2 turns, and that seemed to have solved all of the problems (to date).

Sorry I'm so late in posting about the adjustment to the actuator rod - the only thing I can figure is that the dimensions of the newer master cylinder are just a few millimeters off and that was preventing the internal unload valves in the master cylinder from opening.

It was a serious and reoccurring problem for me, and I am truely surprised it is not more widespread.
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