I have an IH 484 with a brake problem. The brakes will not work unless I pump them 5 or 6 times then they will hold. If i bleed them they will work properly for a few hours them I'm back to pumping them or bleeding them again. I replaced both master cylinders with new CIH parts but this did not help. I did not replace the equalizer valve because of the cost. I'm thinking about bypassing the equalizer valve to see if this will give me dependable brakes. Anyone familiar with this model have any idea where to look for the problem? My other tractors green so these small IHs are new to me.