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Bleeding brakes on Tripacer
I don't actually own a Tripacer but I do have the landing gear which
is being mounted on my homebuilt. I was painting the landing gear and wheels last weekend, which included sand blasting everything such as the backing plate. I had to remove the brakes and wheel cylinder so that I could do a proper job. As I was re-assembling the stuff, I was struck by what appeared to be the lack of a bleeder screw so that the wheel cylinder could be filled with fluid, when the time comes. There is no bleeder screw with a passage directly into the cylinder, as is the practice in the automotive world, but there is a set screw on top of the threaded portion of the cylinder that fits through the backing plate. At first, I had no idea what this set screw's function was, until I began thinking about how the heck I was going to bleed the brakes. The way the cylinder is designed, there is the cylinder itself, with the two pistons to push on the brake shoes of the drum brakes. Then machined to the cylinder is a threaded arm that sticks through the backing plate. This is snugged to the backing plate by a nut against a lock washer. This leaves a longish threaded part to which another piece is attached. This is threaded onto the threads and to this last piece, the brake line is attached. This second part, is machined to fit the flange of the brake line and accept the threads of the brakeline coupler. On top of this second piece is what appears to be a set screw. It's in the wrong place to be a bleeder valve, but that's the only thing I can think it is. I'm half tempted to drill through the backing plate into the cylinder and tap threads for a real bleeder valve. Can anyone tell me, is that little set screw really intended to be a bleeder valve for the wheel cylinder? If so, I'm going to be tempted to attempt to remove everything on the outside of the backing plate but the wheel cylinder, and squirt brake fluid into the cylinder using a syringe until it's filled, then screw the brakeline attachment fitting on, attach the brakeline and bleed from there. Many thanks, Corky Scott |
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