To bleed a 71 and up, you MUST press the button on the end of the combination valve to get a good flow and air out. Also bench bleeding helps, as well as a master with bleeders on the master . I now use a pressure bleeder and a fat zip tie on the combination valve. Been using Dot 5 in my 80 ws6 rear for 12 years. Pedal was a tiny bit softer, but barely noticeable. I love it.
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