Front disc brakes locking up, 72 Duster

oldirish said
Single piston Original Mopar parts probably from a 73? Not sure about the distribution block.

Having both sides lock up and feeling the same is what puzzles me.

Also freeing up after it cools down.

Could header heat cause this?

It’s not header heat.

The hoses can be brand new and separate internally, but that’s usually a “one side” problem.

oldirish said
Power brakes, new booster.

If this started after the new booster install, the adjustable push rod in the booster is the wrong length.