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Parking Brake not holding
Saturday was beautiful for flying in NorCal. My first trip to Auburn for breakfast in 15 years....but on run up my parking brake wouldn't hold. The Johnson bar worked fine, and holding it kept the plane from moving, but pulling the knob wouldn't hold it...it just slowly creeped forward.
Is there an adjustment?
Is there a common problem that can be addressed?
Any advice would be appreciated before I call the shop....DeltaFlyer
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There are a few O-rings in the parking brake valve that you could try replacing and see if it helps.
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I'd check the cable end where it connects to the parking brake to make sure it hasn't slipped. If it doesn't look like it has slipped, the adjustment might be right on the edge internal to the parking brake valve. You might be able to adjust it.
Nate
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Administrator
Look at the valve and see if there is a sticky red fluid around it. If there is replace the o'rings like Zac recommended. Their part numbers are listed in the Univair catalog under the brake section. Nate has a good point too, seen the cable slip in the actuating arm screw.
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Thanks guys...I'll check those tomorrow...DF
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Re: Parking Brake not holding
Just got the same problem but can't find anything at Univair...The valve on the firewall leaks oil, it's all I know so far. Any leads?
Thanks
Gilles
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Re: Parking Brake not holding
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Re: Parking Brake not holding
Originally Posted by
Steve Pierce
Look at the valve and see if there is a sticky red fluid around it. If there is replace the o'rings like Zac recommended. Their part numbers are listed in the Univair catalog under the brake section. Nate has a good point too, seen the cable slip in the actuating arm screw.
Howzzit going Steve?
From what my partner says ( I am away from the aircraft ), it is leaking indeed and I would go with the O-ring route. I can't find anything at Univair's. Have you got a lead for me?
Take care
Gilles
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Re: Parking Brake not holding
Originally Posted by
Glen Geller
Thanks Glen but I'd rather replace the O-rings than the whole part.
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Re: Parking Brake not holding
Originally Posted by
Rudder Bug
Thanks Glen but I'd rather replace the O-rings than the whole part.
I was not suggesting you buy a new valve, the drawing shows how to disassemble it, and lists the oring sizes so you know what to purchase.
It was the answer to your original question.
You should get thru this for a couple dollars and in an afternoon.
Oh, and its not oil or brake fluid, it's hydraulic fluid MIL-5606:
http://www.skygeek.com/phillips-1045...uid-1-gal.html
Cheers,
GG
Last edited by Glen Geller; 07-13-2012 at 05:44 PM.
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