Brake master cylinder woes Options

[jmargush]

I put a new 19mm master cylinder from PMB on my car within the last two years.

The pedal had been getting a little more travel in it over the past week or two.

Yesterday at the Autox the pedal got enough travel that it tripped the warning light on.

Does this point to a failed master cylinder?

If I pump the pedal it will build pressure and reduce travel. after this is done it doesn't seem to drift to the floor with continued pressure.

I bought from PMB because I learned form Eric that the ones you by at FLAPS don't have the correct material in the seals and that a new one should last years.

[worn]

I put a new 19mm master cylinder from PMB on my car within the last two years.

The pedal had been getting a little more travel in it over the past week or two.

Yesterday at the Autox the pedal got enough travel that it tripped the warning light on.

Does this point to a failed master cylinder?

If I pump the pedal it will build pressure and reduce travel. after this is done it doesn't seem to drift to the floor with continued pressure.

I bought from PMB because I learned form Eric that the ones you by at FLAPS don't have the correct material in the seals and that a new one should last years.

The warning light is activated by a shuttle that moves towards the side of low pressure, generally a leak in front or rear of the system. As Dave says it could also be that the fluid got low enough to entrain air in the front or rear causing the low pressure, but a leaking fitting or caliper would be my bet. Check the inside of each tire for signs of fluid. Fix it before driving it more, but you probably have already reached the same conclusion. IMHO the master is the last place I would look other than perhaps to find out which side is low, front or back. Not that Eric is infallible. No wait, not certain about that.