f.kyle(at)sympatico.ca
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 Posted: Sat Oct 05, 2013 5:44 am Post subject: DOT4 and filling the monowheel brake system |
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My great thanks to Max, Remi and Neville for help.
The fault was mine, the stupidy rampant. I discovered a stuck piston in the reservoir/lever component, due to deterioration in the piston rings/cap - sitting for 5 years without inspection. The jammed lever gave clue, so opened up the piston area, replaced the cap and ring and cleaned it. Perfect BUT forgot the condition when I installed the system and ignored the brake cylinder.
There we were, squeezing wildly on the syringe, dripping fluid all over the place. Finally sense slowly prevailed, I took out the brake cylinder and the piston was frozen solid. Took it to a nearby brake repair facility and in twenty minutes we had it cleaned. (Thanks, Neville)
I bought another horse syringe, clipped the nozzle to increase the end diameter to fit and screw into the top master cylinder filler, (Upper Syringe). I then borrowed a neighbour’s boroscope and aimed it at the upper syringe so I could monitor progress while below..
Re-assembled the system. Then I created a suction by pulling the upper syringe to get some suction. Loaded a 600 ml syringe and applied fluid to released bleed valve below. Magic - flowed in like water... When the boroscope showed fluid bubbling into the upper syringe, I pumped the bottom one until no more bubbles arose in it , pulled the bottom to drag the meniscus down to the cap level and removed and capped the master cylinder..
Pulled the bottom syringe, closed the bleed valve, and tried the lever. Pressure, no spongy response and the wheel brakes.......!
Now I know if I had checked both cylinders properly, read the clues and thought a little more about it, I wouldn’t have disturbed my buddies, would have done the job, and saved gas, 15 dollars, and a day’s exertion, plus the celean-up........
Thanks again, Max, Remi and Neville!
Ferg
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