Is it common for master cylinders to just suddenly stop providing a decent amount of force to stop said car.

Just I changed my brakes today worked before then new calipers on nasty air leak when bleeding said calipers now when engine on pedal to the floor no brakes.

Would i be right in thinking the master cylinder is goosed?

 

sounds like there could be air in the system

 

there is an air leak somewhere. Traced it to where the master cylinder bolts to the servo

 

is there a rubber seal in between the master cylinder and the servo?

i had an air leak there but it was due to corrosion on the servo itself

 

Ah well there is no rubber seal there and the servo is rusty. I think brake fluid has been leaking out cos there is lots of surface rust

 

if u've taken the calipers off completely then ur gonna needta bleed ur brakes all the way round..if ur still having problems afta bleeding the brakes then u'll defo need a new servo

and no theres no seal between the cylinder and servo

i upgraded my brakes when i tried 2 bleed the brakes it wasnt happening so hadta change the cylinder..cost me about 40quid new from euro car parts..

 

have changed the master cylinder today bled, rebled the rebled the brakes again still the car only just stops. gonna try another servo tomorrow.

could it be the calipers i've changed too? they are wilwood superlight 4pots