Members with 4 wheel disc systems: Can you lock your wheels?

Kern Dog said

I figured that since the rears don't lock, adding a valve to the rear line would be pointless.

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Have You done a temp check on the rotors?
Find somewhere You can do 4 panic-stops at 45mph, then run around with an IR thermometer, should be able to get the frts to 400-450° & rears to ~200° easily.
Edit; that's with them starting at normal "rolling" temp.