How to drain brake fluid from 4 wheel Disc Brakes?

I always did my own brakes and usually drained and replenished the brake fluid. I have to change a car with 4 wheel disc brakes now. Do I have to unscrew all 4 or just one or two? Also, when I change brakes, I never get that vacuum back. It makes it so smushy the brakes go to the floor. Please help!!!How to drain brake fluid from 4 wheel Disc Brakes?when you bleed brakes your going to need 2 people.

one to run the brake pedal(MAN A), one to run the bleed screw(MAN B).

first top off your reservoir with some DOT 3

DON'T GET THIS ON THE CAR AS IT WILL TAKE PAINT OFF!!!

Goes as follows.

MAN A applies pressure, no need to stomp on the brakes, but apply a solid consistent pressure.



MAN B loosen bleeder valve (brake pedal will become soft here so take it to the floor and hold it).



MAN B after a few seconds tighten bleeder valve completely.



MAN A release pressure on the brake.



just do that in the same order everytime you'll be fine.

Be sure to keep commuication between MAN A %26amp; B.

if you release pressure before tightening or don't apply before loosening, air will get into the line and you'll have to start over. Pump the brakes if you have to before each time.

Do this until you don't get anymore air bubbles coming out when you loosen the valve.

Also I always check the reservoir after each tire or if you had to change a large section of line have someone stand there and watch to make sure the reservoir doesn't go dry.

IF THE RESERVOIR GOES DRY YOU HAVE TO START OVER.

take it out for a test drive and repeat if needed.How to drain brake fluid from 4 wheel Disc Brakes?This is correct for bleeding the brakes, but you will need to do this over and over (regardless of air bubbles) to drain the brakes. I generally just disconnect the main line going to the brake calipers and then pump the brakes; this will drain the fluid much quicker.

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How to drain brake fluid from 4 wheel Disc Brakes?When I change brake fluid on a car I simply open the bleed screw and let gravity do the work, make sure the reservoir does'nt empty!. when you put new pads in the callipers need to reset, it normally takes a few pumps of the pedal to do this.

If you get air in the system you will have to bleed the system to remove it.