i have a 88 4runner that will not release the front calipers. i have changed the calipers, shoes, rotors and master cylinder on both sides and the front brake still will get hot and not release. any thoughts? Booster? what about the proportion valve can it go bad?

 

Replace your brake hoses and check for crushed metal lines

 

Ditto

 

The proportion valve could also be dirty.

 

thanks for the replys. there are no crushed lines visible. if I drive the runner and don't use the brakes to stop (use the trans and the e brake to stop) evrything is fine but once iI use the brakes they start dragging and heat up. once this happens i have to let them cool and they release.

 

did you flush your lines when you changed your calipers
also make sure you dont have a collapsed rubber line
you may need shims for the pads

 

thanks for all the help. I finally traced the problem to my new master cylinder and replaced it and fixed the problem.