I have a 1978 CB750F2 with only 2,300 miles. After much labor to get it running right, the only nagging problem is a sticky rear caliper. I have rebuilt the caliper and cylinder and flushed out all old fluid. The brake will seize when hot, then relase after cool down. I have replaced the brake line and re-examined all the parts several times - same issue. I did notice in the F2 parts explosion a relief valve located under the cylinder spring - but none was found in the body or included in the rebuild kit. Is this my problem? If so, where can I get one?
Thanks, John
