Everyone says to install a proportioning valve when doing a rear disc conversion. I'm curious as to why this would be needed in addition to the LSPV? Has anyone tried adjusting the LSPV to accomodate for the pressure necessary to work the calipers? I would expect that like a regular prop. valve, the LSPV would simply reduce the initial pressure to what would be best for the rear brakes (based on what it's adjusted to). I would've thought that another prop. valve inaddition to the LSPV would bugger up the works, unless the LSPV is eliminated completely from the system. IIRC, the LSPV is connected only to the rear brakes, right? The front brakes receive pressure directly from the master cylinder?