I have changed booster but the boosters piston seal was the thing I guess. But the vaccuum still is to low. The CNC master cylinders are sized to be assisted by a booster. The brake works fine during braking at the same time as down shifting and "engine braking". I have changed pads, now using a "green stuff", better for street use when the brakes aren't warmed up.
Still have low vaccuum during idle rpms.
Regards
Anders
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