Can someone pls help me with a brake questions. Is there a Brake proportioning valve in the master cylinder? I have read some threads on folks doing brake upgrades on 06 Rhinos to move from a 3 caliper to a 4 wheel disc system and some have changed the Master Cylinder and some have not. I have heard a discussion that the proportioning valves may be different.. where is the valve I am hearing about ? Any input?