HI there,
often there is air trapped in the lines and you may have to use a pressure bleeder to clear this air out, also try bleeding the master first, then using brake hose clamps lock off all brake hoses and test the pedal, if hard and high, problem will be in the lines past the clamps, start here.
Mark (mhpautos)
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Wednesday, March 17th, 2021 AT 12:25 PM