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The way to tell if the master Cylinder is US is to have the pedal pumped with the ENGINE OFF, and look in the brake fluid resevoir for bubbles and to notice if the pedal sinks or creeps to the floor at the same time . What should happen is if all is OK then the pedal becomes hard and stays Firm. Once the engine starts it will build up vacuum and all will return to normal... ON ONE THATS OPERATING CORRECTLY. What your doing here is exhausting all the vacuum and applying load directly to the master cylinder without servo assistance. There are tWo ways around this .. you can purchase a seal kit provided the bores are not scored or buy the complete cylinder.

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Because they had some problems bleeding the brakes after i had my new brakes fitted - it wouldn't bleed properly - they eventually got a good pedal but said i should get the cylinder changed as it was a bit suspect!

I can hardly keep my eyes of your "moving" image on the left of your profile!

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It may have been them, ABS system CANNOT be bled using the old pump the pedal to the floor bit, purely because the ABS pump retains the air and locks up therefore brake fluid has to be forced through the system. Also there maybe a pattern to bleeding the brakes that they were unware of.. Volvos have this along with errrr ...Mini Metros! Dare I mention them on the board... been there had that.. do the checks that I suggested above and let us know how you get on.. keep your eye on things as you go, but I think you'll be Okay and that your mechy has over exaggerated....

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