Brake master cylinder ??? (pics)

redfastback said

get a 73-76 a body power disc master with a 15/16" bore. it will have a groove for your pushrod.

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Oh man I wished I knew before now. I bought a MC which is for a manual brake with disk brakes for my year model. I had to order it and it will be here in the morning. Do you think it will have the groove? They don't specify what bore size.