The pin on the combination valve sit flush with the boss when brakes are not applied. Have someone press the brakes and you should see it stick out. That's when you want to push it back in and hold it there while bleeding the rear brakes. That's when 2 assistants are useful unless you have a special tool to hold it in. You don't need to do anything with it during front brake bleeding process.
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'72 C/10 LWB 402/400
Blaine, MN
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