Ricochet, I do not belive our trucks have a LSPV. I know that in the factory service manuals its in their but its not on my truck and I highly doubt you have one either. I belive its called a load sensing proportioning valve its job is to sense where the axel is in relation to the vehicle. All tacomas have em and my little sister land cruiser also, they all have a bar or some sort of connection to the rear axel. The only things connected to our rear axels are the brake line, ebrake line, and 5 links(a four link system with a pan hard).

Anyhow about the front rotors warping. Its my experience that the wheels on our trucks need to be progressivly torqued down in a cross pattern. Without doing this proper torquing of the wheel lug nuts my rotors warped(rather fast)...its would come on very slightly and get worse and worse. Now since I began religiously torquing my wheels every time I take one off I have not had any problems with rotors warping. Also my dad had the same problem with his tacoma and he got our local stealer to replace the rotors...as soon as he got home I retightend the wheels with a quality torque wrench and now many thousand miles later I have yet to hear anything about the brake vibes. So what ya think? Chad