Do I Have a Proportioning Valve? Do I Need One?
I have a Mustang II IFS from Rod & Custom Motorsports w/11" discs, which uses a giant GM master cylinder. The master cylinder has no built-in front-rear brake bias. I certainly don't recall installing a proportioning valve. I spoke w/R&C and verified that there is no built in bias to the MC, and he added, "I'm surprised you don't need one now for the disc/drum combo". As it is now, I can stop very smoothly with the front discs and rear 10" drums, not premature lock up of the rear, etc.
Maybe I do have a proportioning valve some where but don't know where, or is it possible that I'm running without one just fine?
I'm going to get 11" Explorer discs for my new 9" rear end, and I don't know if I'll need a proportioning valve of some kind. If I'm doing okay with the 10" drums, will the 11" discs require the proportioning valve? I'm baffled. Thanks.