Brake Replacement Time

Are you concerned that the brakes on your big truck are wearing then? If so, there are two ways to check for brake wear on disc brakes: by looking and by listening. First, check for wear by looking at the brake pads through the spaces between the wheel’s spokes. The outside pad will be pressed against a metal rotor. Generally, there should be at least 1/4 inch of pad. If motorists see less than 1/4 inch of pad, they may want to have their brake pads inspected or replaced.

Ever heard a high-pitched screeching sound when you apply the brakes on your big truck? That’s a small metal shim, called an indicator, which is giving an audible warning that motorists need to replace motorists brake pads. Drivers should be aware of this sound (which is loud enough to be heard while the windows are up, but not necessarily loud enough to be heard over the radio or air conditioner). If heard regularly, quickly make an appointment with the mechanic.

One exception is if the truck has been sitting after being exposed to water, such as from rain or from washing it. The moisture can cause a thin layer of rust to develop on the brake rotors. This is normal. When first applying the brakes, the pads pressing on the rust-covered rotors may cause a squeal for a few stops until the rust is worn off and then the sound will disappear.

Here are some other signs of brake problems. If you experience any of these, visit a repair shop as soon as possible:

1) Reduced responsiveness or fading. If brakes are not as responsive as they should be or if the pedal “sinks” toward the floor, this could be an indication of a leak in the braking system. It could be an air leak (in the brake hose) or a brake fluid leak. One sure sign of a brake fluid leak is the presence of a small puddle of fluid when the car is parked. Brake fluid looks similar to fresh motor oil, but with a less “slimy” texture.

2) Pulling. If the vehicle “pulls” to one side while braking, it may be a sign that the brake linings are wearing unevenly or that there is foreign matter in the brake fluid. The vehicle may need a brake adjustment or to have the fluid drained and replaced.

3) Grinding or growling. This loud metallic sound means that driving have worn down the pads completely, most likely beyond replacement. The grinding or growling noise is caused by the two pieces of metal (the disc and the caliper) rubbing together. This can “score,” or scratch your rotors, creating an uneven surface. If this happens, do not be surprised if the mechanic says that the rotors need to be “turned” (a process that evens out the rotor surface), or even replaced.

4) Vibration. A vibration or pulsating brake pedal is often a symptom of warped rotors (but can also indicate that the vehicle is out of alignment). The vibration can feel similar to the feedback in the brake pedal during a panic stop in a vehicle equipped with anti-lock brakes.

It is a sign of warped rotors if the vibration occurs during braking situations when the anti-lock brakes are not engaged. Warped rotors are caused by severe braking for long periods, such as when driving down a steep mountain or when towing. Tremendous amounts of friction are created under these conditions, heating up the rotors and causing them to warp. The vibration is felt because the brake pads are not able to grab the surface evenly. For motorists who drive in these conditions, they should make sure to stop periodically to allow their brakes to cool off.

For many truck owners, maintaining the vehicle’s brakes is something that is often overlooked. But keeping the brakes properly calibrated and in good working order can prevent costly repairs down the line and, even more importantly, help motorists avoid a collision. It’s terrible when you see a great looking truck that squeaks everytime it brakes. What’s even worse is a big truck owner who doesn’t take care of their brakes and ends up damaging another vehicle. For the sake of other drivers and the lifted truck industry, keep any eye and an ear on your brakes.

Author: Joseph W. is a staff writer for 4 Wheel Parts.