Why would anyone use DOT fluid and vacuum-based brakes? Mineral oil is much less toxic than DOT, does not absorb water, has higher boiling point. Bleeding Shimano brakes is almost as easy as unscrewing the caliper bolt and pouring oil into the lever system. On the other hand, for Avid-s one needs to observe strict vacuum. Why would so many companies bother with an American-specific oil and vacuum-reliant system? **Mineral Oil** Shimano Magura Tektro Gatorbrake **DOT** Hayes Avid Formula Hope

Advantages of DOT over Mineral Oil:

* DOT has a standard - product that meets the minimum standards is readily available at low cost
* Compatibility with cheap materials used for seals
* Hygroscopic, so water will not collect in a single part of the system



Disadvantages of DOT over Mineral Oil:

* Corrosive despite inhibiting additives, damages paint, skin, metals etc.
* Hygroscopic, so water is absorbed and the boiling point drops over time. Limited shelf life and operating life.