When you open the hydraulic brake line air enters. You will have to bleed the air out before there will be any brake pressure.If the master cylinder is empty there will be air in it to, it is a dual cylinder. Remove both lines at the cylinder you will need a bleeder kit (from auto parts store) or make your own, the way to bleed it is to connect a tube to each port on the cyl. then take both tubes to enter the fluid in the top of the cyl.Slowly work the cyl. till all air is out of the cyl.If the vacuum booster has not had the vacuum released you must do that or the master cyl. will be ruined (with air in the cyl. the booster will drive the piston cups to the end and destroy them) After the master has been bled reattach the lines. Use the tool (from parts house) to hold the apportioning valve open. Keeping the master cyl. full at all times,open the bleeder screws on the calipers one at time and bleed all air out.
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Did you bleed the brake system after replacement of the calipers?
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