Step 1: Add motorcycle hydraulic fluid into resevoir more than ¾ full;
Step 2: Loosen air-fluid escape screw valve at each hydraulic caliper;
Step 3: Press down brake paddle(s). If there are two paddles, work on rare calipers first. Note: when pressing down the brake paddle(s), hydraulic fluid may eject out. So please use paper towels to cover the air-fluid escape valves before press down the brake paddle(s). Repeat pressing brake paddle until hydraulic fluid comes out from the air-fluid escape valves (use small container to hold drip down hydraulic fluid. Keep looking if the fluid comes out continuously, that means no more air left inside of pipes.
Step 4: Make sure there is no more air left behind inside the hydraulic pipes. Check the hydraulic fluid reservoir if need to add more hydraulic fluid. Always keep hydraulic fluid reservoir not less than ¾ full. Press down the brake and hold, then, tighten the air-fluid escape valve screws.
Step 5: Check hydraulic calipers. Press down the brake, the calipers should start working. Check if the calipers can hold brake disks tightly. It means hydraulic brakes functioning.
If calipers could not hold disks tightly, it means some air is still remaining inside of pipes. Go back to step 2 and repeat the process once more.
Step 6. If you have front brake system, repeat from step 1 to work thorugh front wheel hydraulic calipers.
Note. Do not pollute brake pads with hydraulic fluid. Wipeout and clean up all drip off hydraulic fluid. After all brake pipes fill up with hydraulic fluid, all calipers should work and always keep hydraulic fluid reservoir ¾ full, now you can enjoy driving any time you want.