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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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The distribution block (combination valve) has a shuttle valve inside that will slide all the way to one side and lock in that position in order to ground the BRAKE warning light switch to turn on the light and to shut off the flow of brake fluid to the diagonally-split pair with the low pressure or leak so that you will still have brakes to get you home safely and it won't all pour out on the ground. The side that can build pressure (LF, RR) will push the shuttle all the way over.
You need to push the shuttle back to its middle position to reset the light and get flow to all 4 brakes again.
To do this, you need a helper, open all 4 bleeders, push the pedal to the floor and hold it, then close the bleeders on the non-working side (RF, LR), lift and then push down on the brake pedal. You may hear a clunk as the shuttle unlocks from the safety position and slides to the center. Close all bleeders and pump the pedal to resume bleeding. You should have brake fluid out of all 4 bleeders now.
 
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