PL720 4WD L4-2389cc 2.4L SOHC (Z24) (1983)
Brake Rotor/Disc: Customer Interest
Brakes - Explanation of Common Noises
Classification:
BR87-005
Reference:
TS87-103
Date:
June 29, 1987
DISC BRAKE NOISE INFORMATION
APPLIED VEHICLE(S):
All Models with disc brakes (front or rear)
SERVICE INFORMATION
Some Nissan vehicles may exhibit brake noise under certain driving conditions. This Bulletin provides some information about normal and common
noises and appropriate service procedures for each noise. Some of this information may be useful when explaining brake noises to the customer.
Refer to Technical Bulletin BR87-006, "Disc Brake Noise Countermeasure", for information about abnormal brake noises on Maxima, Stanza, and
Stanza Wagon.
General Brake Information
Nissan brake systems have been carefully designed to provide optimum braking performance under various driving conditions. One of the most
important components in the brake system is the brake pad material. The following factors have been taken into consideration to select the best pad
material.
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technical and government regulations
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stopping distance
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vehicle control while braking
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high operating temperatures
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pedal force
^
pad and rotor wear rates
^
moisture resistance
^
friction coefficient stability
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operating noise level
Unfortunately, there is no one brake pad material that provides perfect performance in all of these areas. Changing the material to improve some factors
often causes a performance reduction in other areas. Higher brake operating noise levels in some instances occur as a result of factors which ensure
proper brake performance and safety.
Common Brake Noises
The following brake noises occur most frequently on Nissan vehicles. These noises do not indicate any malfunction or improper operation.
1.
GROANING NOISE AT LOW MILEAGE (0-300 MILES)
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noise occurs with light to medium pedal force
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noise occurs during medium speed stops (20-40 mph)
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noise usually does not occur on the first or second stop
^
noise occurs with warm or hot brakes (not cold)
^
there may be a low frequency "judder" vibration
Nissan applies protective coatings to the brake rotors and pads to reduce corrosion during shipping and storage. These coatings may cause this groaning
noise until they are worn off. Under normal driving conditions, this usually takes about 300 miles. If this noise occurs during the first 300 miles, it is not
necessary to attempt any repairs.
Service Procedure:
There is no service procedure to eliminate this noise permanently. Replacing the brake pads or machining the rotors may cause the noise to disappear
temporarily, but it will return and continue until the coatings are worn off the rotor and pads.
2.
GROANING NOISE (AFTER 300 MILES)