Thankyou for the replys.
The pedal on a good day has little movement before the brakes start working. The pedal feels firm and braking is quite good (for an AU anyway). But on a bad day the pedal will go as much as half way before there is any pressure at all. The brakes still work but just lots of pedal. If you take your foot off the brakes then re-apply the brakes straight away you have a full pedal and good brakes. At least until you go to use it again. Them the same thing happens.
As mentioned before the brakes have been bled at least five or six times. There was no difference between the old master cylinder and the re-built one.
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