Two instant-deaths for master cylinders:

1. Major pedal-stomp
2. Bleeding and depressing the pedal too far (farther than normal hydraulic pressure would allow with a closed system)


One of the most common repairs when someone buys a used car, is to have the master cylinder replaced. This is because a lot of idiots who test drive used cars think that by ramming the pedal to the floor to see "if them brakes are good", they are diagnosing a functional brake system. In another few days, weeks, or whatever... bang--new master cylinder time.

The ABS modulator will let the fluid travel through it. You shouldn't have a problem with the ABS seals. (One thing I would recommend is activating the ABS a couple times a month during wet weather or on gravel or sand or something. It keeps the internals working and the ABS servo motor operational).

The pressure brake bleeders are nice.
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chris herbst, near chicago