Bleed the brakes to make sure there are no air blocks in the line, also check the seals on the brake pistons. If you find that they are ok check the brake booster line is connected properly. If no luck then check that the master cylinder is working properly ie. dropping the fuild level when the pedal is depressed. Word of warning don't look directly into the reserve when some one is pressing the brake pedal. If you have ABS you need to bleed them the right way.
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HOLDEN
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