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...with the handlebars centered, so the front wheel is pointing straight ahead.
Can't say that is way it is stated in any manual, but is logical and the way I do it. I just make sure the line of the fluid level is visible in the window. If you can't see it because it is too high or too low, then the window is useless.
Paul - Glad it worked out.
As an FYI brake fluid is hygroscopic (absorbs moisture), it draws it R ight out the air.... not good for the brake system. Leaving the lid off the reservoir or cap loose on a container is not a best practice. Mentioning with the assumption it was done intentionally.
After I finish any brake bleeding and system refill and after I get a good feeling brake I always pump up the lever and wrap a bungeen cord around it to hold it on pressure and leave it overnight. The next morning or whenever it always has a nice firm brake action. All the micro bubbles are gone.
GRIACG, the purpose in leaving the
cover off was allow any air in the lines to flow upwards and I did get a number of air bubbles when I pumped the brake lever. There was more resistance this morning than last night. The final couple d'etat at removing the air was obviously taking the bike off the centre stand. If I should ever be unfortunate to have this issue again, bumping the off the centre stand will my first step to dislodge any stubborn air.
I am not too concerned about a bit of moisture in the K's braking system as I alternate which bike gets ridden the most in a season. This year is the R's turn for the majority of rides and with a COVID summer in Ontario, I am unfortunately looking at only day trips for the second summer in a row.
The reservoir cap does not need to be off when holding the brake lever/pedal. The volume of fluids and gas does not change inside the system, it just swaps places.