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The first generation XC cars do use more rear brakes than front, usually at about a 2x ratio of rear pads to front pads -- the lifespan of rear pads is generally in the 20 - 30K miles range with 20 - 25K being common. This is caused by the very small pads used on the rears wearing much faster than the fronts due to their smaller surface area.
The bevel gear should not leak. When fixed it should stay fixed. I assume that the leak is coming from the bevel gearbox-to-transmission seal, so fixing should be a matter of remove bevel gearbox, install new seal, no more leak.
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