I had this problem with my silverstone chassis with the EVO1 system on it... it had a double piston master cylinder on it. I changed it to a single piston and it was easy to bleed just connected the bleed tool to piston opened the tap on it then opened the bleed nipples on the caliper first one then when it was clear of air closed it and did same with other...simple...I could never bleed the double one without pumping the brake pedal, and turning the tap on and off on bleed tool...It took ages to do as well...my advice get a single piston from Dartford karting 30 quid well spent in my opinion...I was told at time I enquired with Dartford karting that they had nothing but trouble with the double piston ones as well.
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