Yesterday i changed the brake pads on my 2006 Vauxhall Vectra C, i've done it many times before and did the same procedure this time, however once i had finished i pumped the brakes and the pedal went stiff like its meant to but afterwards the brake pedal has gone really spongy and now i have to push it right down for the car to stop!
can anyone tell me what may have gone wrong this time?