[Fred T]

Lose the line lock.

Wheel cylinders are easy if you buy new or rebuilds at the parts store. I don't know if you can buy them for your truck at the local parts store.

You can rebuild the cylinderrs yourself, but it's not as easy. You need a kit and a hone. If the walls are pitted, I would have them sleeved, your parts store can have that done. If you have to hone too much, the new pistons will leak.

To replace the cylinders, get a good pair of brake spring pliers. After you remove the drum, take a picture of each side, you will need it to put the shoes and springs back in right. The sides are opposite, so unless you can think backward you need the pic of both sides.