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Thread: Sticking brakes

  1. #31

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    Default Re: Sticking brakes

    Jim, I'll look more specifically for a rub pattern on the shoes, but I don't recall seeing a high/low point of wear. I'll see if I can check the shoe radius to the other side shoes for a reference. Thanks for the ideas!

    Brian U.

  2. #32

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    Default Re: Sticking brakes

    BTW, for those interested, here's the low-cost, wheel-up-to-mastercylinder, bleeding solution that worked well for me - all parts readily available at Walmart and local hardware store:

    Brake fld syringe.jpg

    MC Brake Fld Bleeder.jpg

    The connection into the mastercylinder is a simple rubber stopper plug from hardware store - I did shave it's diameter down a tad with dremmel tool. Never came out under pressure, but you could zip tie it down also. The connector for the pump(syringe) to wheel cylinder, came from an inexpensive brake bleed kit, from an autoparts store.

    Note: after new wheel cylinder orings and honing, and bleeding system, it would not build up pressure, so now in the process of rebuilding mastercylinder. Parts are ordered.
    Last edited by bubben24@windstream.net; 11-28-2019 at 06:06 PM.

  3. #33

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    Default Re: Sticking brakes

    One more added note:
    Initially, I tried Viton o-rings from Harbor Freight, for the 2 in the Parking Brake Cylinder (Scott 4200), but regretted it. Had to pull it back off the firewall as it was leaking past the internal o-ring and out the top of the cylinder. The Viton o-rings weren't thick enough. There was an O-Reilly's Auto parts store nearby and fortunately, they had both o-rings. Put it back together and re-installed it on firewall...no leaks. Getting ready to ramp test it tomorrow.
    Last edited by bubben24@windstream.net; 12-10-2019 at 11:26 PM.

  4. #34
    Administrator Steve Pierce's Avatar
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    Default Re: Sticking brakes

    With all the work involved in disassembly, bleeding etc. is why I use AN/MS spec o'rings from Aircraft Spruce.
    https://www.aircraftspruce.com/catal...ickkey=3008481

  5. #35
    andya's Avatar
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    Default Re: Sticking brakes

    I am same as Steve, as the time it takes to fix some of the things that need attention is too much to have to do it again.
    "Progress is our most important problem"

  6. #36

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    Default Re: Sticking brakes

    Thanks Steve and Andy. I used all certified parts to rebuild the MC under the seat, but really wanted to fly the day that I used the O'Reilly's o-rings in the park brake valve. And so far, no issues with them. One good thing is that I've become very acquainted with my brake system. ;-) Glen's steps to bleeding are spot on and worked great. But after all of that...flushing, re-building all cylinders (new internal parts), etc, my left side shoes were still 'grabbing/sticking'! I re-adjusted cam bolt, and so far with it jacked-up, it's working without sticking. Ramp test tomorrow. Thanks for all of the great info!

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