International house told me it needed rotors and master cylinder. they said they could fix me up for $3,300. i thought this was a little high as the international house 60 miles away could do it for half price, but were two weeks out. so i bought parts, installed and still have lights and chimming. bled all lines and have no fluid or very little at rear. im assuming this is the low pressure it is indicating. IS the Wabco sytem something that has to be reset at dealer or am i looking at different problems?