Quote:
Originally Posted by Piotrsko
As long as one end of the drain tube stays attached to the zerk and the other remains submerged or you don't run out of fluid in the master, you can bleed brakes by yourself. I do it all the time. You're removing air from the fluid and replacing the old fluid with new.
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I always replaced it myself in older vehicles. But newer ones have many fluid circuits, especially hybrids that not only have ABS and traction control circuits but also circuits that hold back fluid pressure during regen braking.
Just pumping the pedal and keeping air out is not enough anymore for actually replacing the brake fluid in the entire system because you have to have a tool to open the valves to each of those fluid circuits. Otherwise the new fluid just goes around the internal parts instead of through them.