I should have added that both times that the front brake caliper failed was shortly after adjusting the brake cable. The first time was fairly soon (maybe 1/2 mile) and the second time just a couple of miles after. Both times I raised the bike and did a very slight adjustment on the inside adjustment and everything was fine for quite a while. That never happened with the rear caliper. So I was thinking maybe something is wrong with the front one which is the main reason I'm thinking about trying the ones above.