I have a 53 f100. Last year, the master cylinder, brake lines, hoses and wheel cylinders were all changed. Brakes worked great all spring. However now, they are building up pressure while driving on trips over 5 or 6 miles to the point of basically locking up. After this, if the truck sits for an hour or so, the brakes eventually leak down and you can drive it again. Any idea on what the problem/solution is?