If you have been taking your Hummer on expeditions to the great outdoors for a lot of heavy workouts under extreme conditions, then you must take care to pay attention to the condition of your Hummer brakes. Failure to do so can result in a catastrophic accident or engine failure. Luckily, your well-engineered Hummer brakes are designed to give you plenty of warning before failure occurs. Sometimes, just the simple act of listening to your car can help you diagnose brake problems. You might hear squealing at low speeds that are emitted from your break wear sensors. The brake pedal might be 'hard,' or resistant to pressure. Or, the brake might require a tremendous amount of pumping to react quickly. There might be vibrations or pulsing when you hit the brakes. A visual inspection of your brake pads will give you an indication of trouble, as well. If the pad depth is less than ? inch, then replace the Hummer brake pad soon. If it's less than 1/8 inch, you are risking damage to the rotor and replace those pads with genuine Hummer brake pads immediately. Regular brake inspection and replacement of faulty parts is a smart way to avoid road trouble and high repair bills in the future for your Hummer brake system.