Proportioning Valve: w/lines Chrome 64-80This CHROME BLING KIT suits those operating 1964 & 81 era GM Drum REAR or Disc Rear DISC FRONT GM brake conversions. MAKE SURE YOU OR YOUR MECHANIC USES A "PVTOOL" before bleeding this value or you will bugger it up and try and say its faulty.. which it will be because of the bleeding proceedure.. .. SEE THE HELP listing for Pro Valve assistance.. its free.. do it! The proportioning valve body is set up for Disc Drum & DISC DISC set ups.. .. , lines