JohnTB Posted July 31, 2022 Report Share Posted July 31, 2022 After three days of trying to bleed my brakes using a vacuum pump, I am still getting air bubbles (and quite a lot!). All the Bleed nipples seal ok but air must be getting in somewhere. Decided to take a look at the master cylinder and there was a very slight dribble at the union with the Servo. I took the master cylinder off and found traces of fluid at the union(s) between the cylinder and the reservoir. On removing the reservoir it appears that fluid, and air, is passing the two rubber 'O' rings. I'm thinking of using Wellseal at these two 'O' rings in order to seal the unions but I don't know the effect on DOT 4. Would very much appreciate observation/comments/recommendations Quote Link to post Share on other sites
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