Some manufacturers provide a means of notifying the driver that the brake pad linings are worn to their minimum limit. This helps ensure that the brake linings do not wear down to the point that they cannot properly perform their job anymore. Observe full details under casino bonus ohne einzahlung. Excessively thin brake linings tend to heat up quicker than thicker linings, which can lead to premature brake fade. Not all manufacturers use a brake lining wear indicator. In those cases, it is especially important to inspect the brakes at regular intervals, usually during tire rotations or oil changes.
Types of Wear Indicators
FIGURE 32-26
The scratcher brake wear indicator.
Some manufacturers use a mechanically operated wear indicator to notify the driver that the brake pads are worn to their minimum limit. This is achieved by a spring steel scratcher mounted to the brake pad FIGURE 32-26. Part of the scratcher extends below the brake pad backing plate at the lining’s minimum wear thickness. When the friction material wears down far enough, the scratcher contacts the surface of the rotor and makes a squealing noise similar to fingernails on a chalkboard. This distinctive noise means the brakes need service right away. When you replace the brake pads, make sure they come equipped with new scratchers set to the correct depth so they can function the next time the pads wear down.
Some manufacturers use a warning lamp or warning message on the dash to alert the driver that the lining is worn to its minimum thickness. These systems have an electrical contact installed on the brake pad at the point of the lining’s minimum wear thickness. When the pad wears to this minimum thickness, the contact touches the rotor as the brakes are applied, prompting a warning light or warning message that tells the driver the disc brake pads are due for replacement. These contacts can be manufactured into the pad or they can be clipped onto the pad. The contacts are normally replaced when the pads are replaced. Make sure that either the contacts come with the new pads or order them along with the pads.
TECHNICIAN TIP
In many cases, the scratchers will start to make noise when the brakes are not applied and stop making noise when the brakes are applied, as applying the brakes tends to dampen the vibrations.
