Reno L4-2.0L (2006)
The level of vibration can be affected by ambient temperature and humidity, by road conditions such as dust, sand, mud and road salt. Also the
thickness or condition of the brake pad plays a role in many cases. Normally adding or removing shims and applying high temperature grease
between the pads and shims dampen and isolate most of the noise.
2-2 Groaning noise with ABS (sometimes clunk / click noise)
Typical complaint
A brief groaning noise is heard when first starting the vehicle.
What is it and why
On vehicles equipped with ABS (Anti Lock Brake System), the ABS unit emits a brief grunt or groan when the ABS unit does a self check. This
self check will be completed after every engine start and may be heard once the vehicle starts moving either forward or backward.
What can be done
No action required -- this is a normal function of the ABS system.
4.
Clicking noise
Typical complaint
A click noise is heard when applying the brakes after backing out of a parking space. This click is heard again when applying the brakes after
driving forward a few feet. It seems to only occur after changing from forward to reverse or reverse to forward.
What is it and why
The clearance between the brake caliper bracket and the ends of the brake pads allow for heat expansion and helps avoid corrosion between the
caliper bracket and brake pads. This clearance can cause the pads to hit the caliper bracket when you first apply the brakes in a new direction of
travel. The single clicking noise heard is a normal characteristic of the brake system.
What can be done
No action required -- this is a normal characteristic of the brake system.
5.
Grinding noise
Typical complaint
Grinding noise heard during light braking during the first few stops after first starting to drive.
What is it and why
This noise is common primarily during the first few stops on rear drum brakes and on some front disk brakes due to the formation of trace rust
corrosion after the vehicle has been parked overnight. This light corrosion is typically cleared from the metal surface after a few stops.
What can be done
If the rotor surface does rust, the area under the brake pads usually remain rust free. The difference in friction between the rusted and un-rusted
areas may produce a slight brake pedal pulsation, vibration and / or noise for several stops. This will improve as the brake pad friction against the
rotor polishes the rust off the rotor. Usually three or four stops will polish the rotor surface.
Disclaimer
