how can i fix my vauxhaul corsa 1 litre 2004 model with abs?

If you pushed the caliper piston back without opening the bleed nipple you may have flipped a seal in the ABS unit or master cylinder.
Blank off the pipe from the master cylinder then try the brake, if the pedal goes to the floor, the cylinder is faulty. If the pedal is solid, the problem is further down.
Vauxhall dealers use their Tech 2 diagnostics to activate the ABS modulator while bleeding, if you allowed a lot of air in to the system this may be your best option.

vaux
April 2010

try bleeding it normally with ignition on

peesian
April 2010