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Thread: Sticking brakes

  1. #1
    Theo's Avatar
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    Default Sticking brakes

    Ok, this time I added fluid to the brakes and now they are sticking. They release ok when release the parking brake but if I use the hand brake while taxiing they grab and or stick. I am guessing the best way t get it to stop is bleed a little using the lead bolt on the brake housing?

  2. #2
    Glen Geller's Avatar
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    Default Re: Sticking brakes

    Theo, we need a little more info:
    Tri-Pacer or Colt?
    Original Scott M/C or "Booster" type (North River or Steve's Aircraft)?
    Original drums or newer disks? The drum brake "housings" have a screw with an oring, very difficult to bleed from there without some bits and pieces and demonstrations; disk brakes a more like automotive bleeder, crack open valve while helper gently applies a bit of pressure to handle.

    On my 55 Tri-Pacer with the rather finicky North River Booster and original drum brakes, I apply the brakes firmly then set the parking valve; then open the M/C, pull and HOLD the lever until the fluid appears at top of filler opening, then install the bolt. Then yank the brake lever to release the parking valve. Then I check the operation of the brakes to see if they drag, or have the correct feel, and slight play in the Johnson Bar. Make additional adjustments to add or subtract a few drops until it's just right.
    Glen Geller
    1955 PA22-150 "One For Papa!"

  3. #3
    Theo's Avatar
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    Default Re: Sticking brakes

    It is a 56 Tri-Pacer with what appear to be the original Scott drum bakes. The sticking seems to be mainly on the left side.

  4. #4

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    Default Re: Sticking brakes

    Since you needed to add fluid - you may want to check that the wheel cylinder is not leaking and causing the brake shoes to grab due to fluid getting on the lining.

  5. #5
    Administrator Steve Pierce's Avatar
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    Default Re: Sticking brakes

    There is also a cam on the wheel cylinder that can be adjusted if they are dragging.

  6. #6
    rsrguy3's Avatar
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    Default Re: Sticking brakes

    Disregard... found it
    Last edited by rsrguy3; 04-02-2015 at 12:46 AM.

  7. #7
    Administrator Steve Pierce's Avatar
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    Default Re: Sticking brakes

    The cam, a leak or what?

  8. #8
    rsrguy3's Avatar
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    Default Re: Sticking brakes

    Just found the fluid requirements

  9. #9

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    Default Re: Sticking brakes

    Hi, I know this post is from 2014, but I have a similar problem on our '57 PA22-150. Can you elaborate on what your solution was? Thanks!

  10. #10
    Administrator Steve Pierce's Avatar
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    Default Re: Sticking brakes

    Quote Originally Posted by bubben24@windstream.net View Post
    Hi, I know this post is from 2014, but I have a similar problem on our '57 PA22-150. Can you elaborate on what your solution was? Thanks!
    Stock brake system? One side or both? When did it start and was there any maintenance done that started the problem?

    The stock Tri-Pacer brake system uses a master cylinder that is sealed from the atmoshere. I have had them stick when serviced in the morning and they drag in the afternoon as the outside temperature rose and the fluid expanded. Any details you can provide might help diagnose.

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