At 07:29 PM 09/10/2002, you wrote:
>Using this wonderful tool, I noticed that on a short 5 mile trip, the
>temperature of my front wheel hubs were approaching 270 degrees.
>(The rear drums were a cool 170 degrees)

What's the temp of the calipers? If they are hotter than the hubs, they are
the likely source. If they are cooler, look to the wheel bearings.

>I've replaced the rotors, calipers, hoses, and master cylinder, but none
>has improved the situation.

Low cost no name parts or quality brand name stuff?? Can make a big
difference. Also, did you flush new fluid through the system BEFORE you put
on the new parts, or flush the filthy fluid into the new parts when you
bled them??

>Could having the wheel bearings too tight cause this problem?

Indeed, make sure they are adjusted properly. Also, after a run of several
miles, jack up the front end and see if the wheels turn freely. That's the
empirical test for this problems. Confirm it. Another possibility is the
rebuilt calipers. If they were no name white box $39.95 loss leader weekend
FLAPS specials, could well be it, or, as above, even if quality parts you
may have re-contaminated them or the hoses with old gunky fluid.

Though consider, new pads and rotors will heat up quite a bit until broken
in. See my sqeaky brakes post of a few days ago for the procedure.