Brakes - Front Brake Groan or Growl Noises
Classification:BR06-004
Reference:
ITB06-007
Date:
March 2, 2006
2004-2006 QX56; GROAN NOISE FROM FRONT BRAKES
APPLIED VEHICLES:
2004 - 2006 QX56 (JA60)
APPLIED VINs:
2004 and 2005 Vehicles, All VINs
2006 vehicles built before 5N3AA08(**)6N 808731
APPLIED DATES:
Vehicles built before February 10, 2006
IF YOU CONFIRM
A "groan" or "growl" noise coming from the front brakes,
NOTE:
If this incident should occur, it happen after the vehicle has been stopped several times using moderate to hard braking effort. The noise might then be heard during the last few feet of braking when coming to a stop.
ACTION
Replace the front brake pads with the new ones listed in the parts information.
NOTE:
The new brake pad kit includes new pad retainers and backing shims.
IMPORTANT:
The purpose of "ACTIONS" above is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.
PARTS INFORMATION
CLAIMS INFORMATION
Submit a Primary Part (PP) type line using the claims coding table.
SERVICE PROCEDURE
1. Remove the front brake pads.
^ Refer to section BR in the Service Manual for brake pad removal.
2. Inspect the rotors; service as needed.
^ Refer to section BR in the Service Manual for brake rotor inspection and service information.
3. Prep the inboard brake pads for installation.
a. Apply a moderate amount of Molykote(R) M77 grease-P/N 44003-7S000-to the back of each pad as shown in Figure 1.
NOTE:
^ The inboard pads have a straight edge and pad wear sensor. The inboard backing shims have cut-outs on the edges.
b. Install the shim and push down on it to squeeze out any excess grease.
c. Clean off all of the excess grease that squeezes out (see Figure 2).
CAUTION:
Don't get any grease on the brake pad or brake rotor friction surface.
4. Prep the outboard brake pads for installation.
a. Apply a moderate amount of Molykote(R) M77 grease-P/N 44003-7S000-to the back of each pad as shown in Figure 3.
NOTE:
^ The outboard pads have a curved edge.
^ The outboard backing shims do not have cut-outs on the edges.
b. Install the shim and push down on it to squeeze out any excess grease.
c. Clean off all of the excess grease that squeezes out (see Figure 4)
CAUTION:
Don't get any grease on the brake pad or brake rotor friction surface.
5. Install the new front brake pads and pad retainers.
^ Refer to section BR in the Service Manual for brake pad installation.
^ Apply a thin layer of Molykote(R) M77 grease-P/N 44003-7S000-to the pad retainers.
^ Make sure the inboard pads are installed with the wear sensors facing down-towards the ground (see Figure 5).
6. Reinstall the Wheels and Lug Nuts.
^ Tighten lug nuts to 133 N m (14 kg-m 98 ft.-lb) with a Torque Wrench.
^ Do Not tighten the wheel lug nuts with an air impact wrench.
^ If you apply uneven or high torque to the lugs it may distort (warp) the brake rotor and hub. This could cause increased rotor runout and excessive rotor thickness variation as the rotor wears.
7. Burnish the brake pads.
a. Drive the vehicle on a straight smooth road at about 30 mph (50 kph).
b. Use medium brake pedal/foot effort to bring the vehicle to a complete stop from about 30 mph (50 kph). Adjust your pedal/foot pressure so that the vehicle stopping time is 3-5 seconds.
c. Cool the brakes down by driving at about 30 mph (50 kph) for approximately one minute without stopping.
d. Repeat a, b and c (above) ten times to complete the burnishing process.
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