[Nigel Booker]

Dave,
if you have adjusted the rear brake lever it would pay you to slacken it back off asap. If you attempt to get a better rear brake by adjusting the amount of travel in the pin and clevis on the master cylinder you can over adjust the pin and not allow enough return movement on the cylinder. This has the effect of cutting off the return flow for the brake fluid and keeps the fluid into the rear caliper under constant pressure. This in return results in heat build up in the caliper, disc, brake line and master cylinder.