Loud knock coming from rear end
05-08-2010, 09:28 PM
#1
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Year: 1999 & 2004
Model: Grand Cherokee
Engine: 4.0 + 4.7
Loud knock coming from rear end
My 2004 Grand Cherokee (4.7 - Quadra Trac) has developed a loud knocking sound when the car starts moving fwd. It seems to increase in frequency / volume as you speed up, but diminishes as you apply the brakes. This leads me to suspect the rear brakes may be the culprit, but that is just a guess. It seems isolated to the left-rear side only. Any ideas what I may be faced with here? TIA Stew
05-09-2010, 09:34 AM
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Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
There may be a problem with the pads coming loose (de-laminating) from the backing material. Applying the brakes/pressure makes them remain in contact and stops the noise. JMO
Could also be an issue with the wheel lugs. JMO
Dan
Could also be an issue with the wheel lugs. JMO
Dan
05-09-2010, 10:57 AM
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Year: 1999 & 2004
Model: Grand Cherokee
Engine: 4.0 + 4.7
Thank you gentlemen. I will check the lugs first as I recently had new tires installed. I am thinking the rear brake pads are a strong possibility since they have around 60K on them and are about due for a change anyways. Can anyone recommend a great pad for me to use?
05-11-2010, 11:25 PM
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Year: 1999 & 2004
Model: Grand Cherokee
Engine: 4.0 + 4.7
Just got the car back from my mechanic and ..... the rear handbrakes were falling off. New ones installed - got away for under $200.
05-12-2010, 12:13 AM
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Year: 2004
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The e-brakes inside the rotor? Wow, that 's weird. Well you said you hadn't done the rear brakes in a while, so did you do those too when you serviced the rear pads and rotors? I guess not.
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