I need to know where to begin. I have a stock 59 3100 that I bought a month ago it seems like only the back brakes are working in fact sometimes they lock up and slide if I brake semi hard. Where do I begin bleeding the brakes or adjusting the front out or changing the brake shoes need a little help on where to start and what to do. The truck stops fine but if you brake hard the back locks up and begins to slide but I don't brake hard enough where they should slide. At first I thought it was one back wheel locking up on braking like a leaking wheel cylinder but it is both back wheels locking to quickly.
