Soft Brakes

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I replaced the master cylinder and now my brakes are barely there. It’s a remanufactured master cylinder so it could be that it’s not working properly. It’s only pushing fluid to the front when I bleed the brake calipers. I think I may need to replace the lines from the master cylinder to the valve that feeds the brake lines, but the rear one is stuck and I don’t know if I can remove it without breaking it. What are those lines and valve called so I can look for replacements?
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