ADVICE FROM BENDIX
The company provides advice on today’s modern brake pad wear sensors
In today’s sophisticated automotive world, electronic brake wear sensors are fitted to a wide variety of modern cars, especially European cars.
They tell you when it’s time to replace your worn brake pads, but how do they work and how often do they need to be replaced?
Electronic brake pad wear sensors replace the traditional metal squealer tabs found commonly in braking systems. These tabs work by rubbing against the rotor once the pads have reached the end of their service life. By making a loud squeal it simply lets the driver know that the brakes require service.
The downside of this warning apart from the squeal is that most drivers tend to ignore the warning thinking the sound will eventually go away. Electronic brake wear sensors don’t have the noise element and give the driver a more accurate gauge on how much brake pad life is left.
The new wear sensors are designed to break or complete a circuit once the brake pad has worn down enough for the sensor to contact the brake rotor. This will usually activate a warning light on the dash indicating to the driver that it’s time for a brake pad change.
Brake pads wear systems feature a sensor in each corner of the vehicle and are usually installed within the inner brake pad. However the number of wheels fitted with sensors and their placement on the brake pads can vary from car to car. These systems usually consist of a wire loop with a small amount of current running through it.
Modern brake wear sensors have gained a few more tricks as they not only alert the driver of a brake service being due but they can also estimate how much life you will get out of the current pads. These trick sensors work using two resistor circuits running parallel at two depths in the pads and are known as two stage sensors.
As the first resistor circuit breaks the resistance in the sensor increases and this is used to gather information such as wheel speed, brake pressure, brake disc temperature, brake operating time and mileage to estimate the life remaining in the brake pad.
This is usually displayed in the vehicle’s information centre as a warning light that varies in colour as the pad wears. Once the second circuit is broken it triggers the warning light that lets the driver know that it’s time for a brake service.
As brake pad wear sensors are designed to break or complete a circuit by contacting the brake rotor, they are not reusable and should be replaced with every brake pad change.
Bendix Euro+ Brake Pads come with all the necessary clips, shims and sensors for most popular makes and models so you are fully equipped for the next service job.
Bendix says its Euro+ Brake Pads are guaranteed to fit most common makes and models and are available from Bendix stockists.
For more information, visit www.bendix.com.au/stockists or view the Video on Wear Sensors