Vauxhall tigra 1996 1400.replaced rear

hi. im sure that brake pads are the right reference to your car, but did you cut the disc surface? if you didn´t you must wait until the brake pad surface be in complet contact with the disc surface, meanwile your pedal brake will be to soft because it makes kind of elastic movement in the brake pump. maybe that´s the problem, just wait a few more brakes and see what happens. hope this help you.

did you replace the rotors? if not the first guy is right they will have to wear in so that the surface is flat to the rotor and disc's but still will need to be bleeded again.