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Start by fixing the location you clamped, it may be the source of the problem. With the power brakes, it takes some pressure to push the pedal when the engine is off. You need an assistant so you can press the brake hard, have them open the bleeder valve, close it, then take another step on the brake. When lines and stuff are replaced, it can take several dozen pushes to compress the air in the line enough that the fluid starts moving, have had this happen to me before.