just picked up a '90 t4r the I bought it from had just put a baically a new brake system on it. new calipers, new rubber lines all around, rotors/pads, and master cyl. the problem is when you drive it for about 10min the front calipers lock up, if you break the nuts loose on the master for the front the calipers release, another 10- 15 min go by the same again, I've called the guy he says it the caliper and will pay to have it done. I'm fairly mechanical, that doesn't sound like a cailper to me. HELP if you can, any info is welcome