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Thread: Parking Brake not holding

  1. #1
    DeltaFlyer's Avatar
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    Default 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

  2. #2
    Zac Weidner's Avatar
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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.

  3. #3
    Nathan Hiebert's Avatar
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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

  4. #4
    Administrator Steve Pierce's Avatar
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    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.

  5. #5
    DeltaFlyer's Avatar
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    Thanks guys...I'll check those tomorrow...DF

  6. #6
    Rudder Bug's Avatar
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    Default 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

  7. #7
    Glen Geller's Avatar
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    Default Re: Parking Brake not holding

    You guys are a bunch of amateurs.
    http://www.avoxsys.com/pdf/brochures...ngBrake500.pdf

  8. #8
    Rudder Bug's Avatar
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    Default Re: Parking Brake not holding

    Quote Originally Posted by Steve Pierce View Post
    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

  9. #9
    Rudder Bug's Avatar
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    Default Re: Parking Brake not holding

    Quote Originally Posted by Glen Geller View Post
    Thanks Glen but I'd rather replace the O-rings than the whole part.

  10. #10
    Glen Geller's Avatar
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    Default Re: Parking Brake not holding

    Quote Originally Posted by Rudder Bug View Post
    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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