Why After few miles the brakes on my transit start to bind and pedal goes hard What is wrong?

If the brakes on your transit start to bind and the pedal goes hard after a few miles, it could indicate a problem with the brake system, such as a stuck caliper, a malfunctioning brake booster, or issues with the brake lines. A stuck caliper can cause excessive friction, leading to overheating and brake fade. Additionally, a failing brake booster may not provide adequate assistance, making the pedal feel hard. It's important to have your braking system inspected by a professional to identify and resolve the issue safely.