Home Made Brake Pressure Bleeder & Universal Master Cylinder Adaptor

[Troll Hunter]

A good vid, thank you. I've used something similar, but with brake fluid in the spray bottle. Starting with the fluid level in the brake fluid reservoir (BFR) a little below the max imum level the pressurized spray bottle would pump brake fluid into the BFR increasing the fluid level in it. Also, the pressure of the air that was in the BFR would be increased. Bleeding fluid from the brake system resulted in the fluid level in the BFR being maintained due to the pressure in the spray bottle transferring more brake fluid. On completion of bleeding and releasing the pressure from the spray bottle, the residual pressure in the BFR would return fluid from the transfer hose back into the spray bottle. I never had a problem with the BFR being overfilled and a mess everywhere. The level in the BFR would be virtually the same as when the operation started since the BFR still contained the same volume of air as at the beginning. Of course, this system requires an airtight seal on top of the BFR, otherwise air can be lost and the BFR overfilled.

Mike