Air in the system would tend to get worse and worse rather than change randomly. It could be the servo on the way out, if diaphram has split it can seal sometimes better than others and cause variations in braking pressure.

If it is air in the system then i can be getting in due to a fault in one of the wheel cylinders, the seals can fail in such a way that they suck air in when the pedal is released but they still don't let fluid out when the pedal is pressed.

Jim


On 06/11/2011 16:51, shaun mcsorley wrote:
The brakes were so soft and i was barely getting anything from them. My local garage told me that it was because there had been a brand new one put on but not machined on properly so i had to get a new one. the brakes are starting to feel the same again with the pressure changing randomly, hopefully i may just have air in my brakes. im only 17 and brought this car to improve my knowledge on engines ect but i think the garage feel they can take the michael abit, especially how i had 3 burst coolant pipes and then the broken master cylinder a week after they gave it a full check over!

On Sun, Nov 6, 2011 at 4:39 PM, Jim Hearne <[email protected] <mailto:[email protected]>> wrote:

    Nothing that i can think of.
    Why was it replace last time and what makes you think it's going
    again ?
    If this is the one that cost you £350 i'd go back and make them
    replace it.

    Jim



    On 06/11/2011 16:33, shaun mcsorley wrote:

        After having the brake master cylinder changed only a couple
        months
        ago and costing fortunes, i'm pretty sure its going again?
        does anyone
        know a possible reason that would cause the master cylinder to
        continuously break?
        Many Thanks
        Shaun McSorley


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