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dude, seriously. you need a new one.
don't try to just flush it out. it won't work.
get a new one, along with the rest of the system.
but to answer your question, it isn't hard, Just do the same process you would like you were bleeding your brakes after a brake job. Start at the passenger side rear. pump the brake pedal a few times. then hold the brake pedal down. loosen the bleeder enough to let the fluid/air come out, then tighten quickly. before letting off the brake pedal. then repeat until the fluid comes out clean, clear, and bubble-less. then move to the next caliper...
To do it right, you need to bench bleed the master.
1. Secure the master cyl in a bench vise.
2. Install lines from the kit making sure they're always submerged in fluid.
3. Use a blunt and long phillips head screw driver and slowly depress the plunger until all bubbles are gone.
This should take you a while to do. If you do it in 3 minutes, you're doing it wrong and should spend more time.
Some Brake master cylinders Have to be bench bled, Some do not.
it is easyier to bench bleed them tho, And yes you still have to bleed the brakes after you reinstall it. Its impossible to keep the lines fully filled with fluid and install or remove the master cyl.
Bleeding at the master will not get out any air that is already down by the calipers. If you take an ASE test and say bleed the brakes at the calipers isnt required after replacing the master cyl you would be wrong big time.
I hope the reason for bleeding the system wasnt fluid contamination (cause if it was then you should remove the master cylinder :replace: and remove lines from calipers and use brake parts cleaner to clean the contaminated fluid out and prevent it getting to the seals in the calipers) if your car has ABS there are also bleeders on them :some cars:
If it was bleed like regular with a contaminated fluid like powersteering (PS fluid eats away/damages most rubbers and seals and ABS pumps in brake systems and will do damage either right away or down the road
Crew Cheif / Lead Mechanic
*RACE CAR FABRICATION