FAQs—Mercedes Benz 500E
My brakes are squeaking too much when I press on the brake pedal. What is wrong?
Brakes usually squeak after it sat overnight mainly because of moisture that has accumulated on the surface of the rotors. When moisture accumulates on the rotors, it causes rust to form on the rotors. As it turns when you use your car in the morning, the brake pads scrape off the rust that has formed, and then the rust gets stuck on the brake pads. The rust that gets stuck on the pads gets embedded to them and then causes the squeaking sound.
Another common cause of the squeaking sound is when the brake pads are already about to wear out. Car brakes have brake wear indicators that squeak when the pads are getting thin. It is an effective way of letting you know that the brake pads are almost used up and already need replacement. The wear indicators are made of hardened steel and molded to form small metal tabs. These tabs are designed to come in contact with the rotors before the pads get used up, which then causes the squeaking sounds.
The brakes also squeak if there's too much metal content in the brake pads. Brake pads contain bits of metal. It is normal. However, if there's too much metal content, which are found in cheap brake pads, it causes the squeaking sound when you step on the brakes. What cause the high pitched squeaking sound are the big bits of metal that drag on the rotors.
I've checked the brake pads, and they seem to be okay. So any idea what could be causing this annoying sound?
The squeaking sound may also come from the drum brakes that need to be lubricated, which is evident when the squeaks come from the rear brakes. When you experience this, it means that the shoe-to-backing-plate contact points need to be lubricated. If these contact points are not lubricated properly, rust will start to form on it, which then causes the squeaking sound. This is quite easy to fix since all you need to do is to lubricate it with a high temperature, anti-seize lube.
My engine is constantly overheating. What is wrong with it?
Constant engine overheating can only mean that your cooling system's ability to absorb, transport, and disperse heat in the engine is decreased or lost. This can be caused by a number of reasons, and one of them is caused by a leak or leaks in the cooling system. This is actually the primary cause of engine overheating. Leaks can be found just about anywhere on the cooling system like the radiator, hoses, water pump, heater core, thermostat housing, head gasket, transmission oil cooler, freeze plugs, and cylinder heads and blocks. To find out if there's a leak and where it is coming from, you need to perform a pressure test. If the cooling system is leaking, it will not be able to hold pressure for a minute. The tricky part is finding the leak/s. You will need to inspect every component in the cooling system for that.
Another known reason is a wrong coolant mixture. Your vehicle's manufacturer normally recommends a certain coolant mixture. If you put the wrong type of coolant or the wrong coolant concentration, it can also result in an overheating engine. When this happens, you need to flush out the coolant completely and fill it up with the right one.