Hi,

This is going to be a bad brake hose on that side. There is an inner rubber to the hose and it will collapse when brake fluid gets too hot. When it does this, it acts as a one way valve, allowing fluid and pressure to the caliper but preventing it from returning until the fluid cools off. This is usually caused by not flushing the fluid every 2yrs and having condensation buildup in the fluid which lowers the boiling point of brake fluid.

Easy test for this to confirm. Take on test drive until it starts locking up. Pull over and open the caliper bleeder screw for about 30 seconds on the side locking up. Now tighten bleeder screw and pull forward a few feet to confirm that caliper released. If it has, replace the hose and flush your brake fluid

If, by chance it hasnt, then it will be the master cylinder, but this is a rare event for it to be that.


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