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I need to know what i need to fix on my lexus ls400(1992)....when i hit bumps in the road i hear a loud knocking sound on the driver front wheel...but smooth roads theres no problem.
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The knocking on the front could be a ball joint and the rear could be a suspension linkage. The grinding might be a wheel bearing. Does the grinding change with road speed? The window problem could be the actual switch. Try using the switch on the drivers control AND for the window in question. The switch where the fault happens is the one you need to replace.
Loud knocking may be due to a broken front sway bar end link, common problem on Grand Cherokees. Rear window not going up could be a bad window motor, switch or wiring. Those will have to be checked out to determine exactly what it is.
See if you can bounce car and replicate the noise. If you can, you should be able to find it, and put your hand on it. Stabilizer bushing are a place to look, both at the lower a arm and on the frame. If you narrow it down to the strut, it will need to be replaced. The front trans mount also goes bad, try putting it in drive with your foot on the brake and give it some gas and see if the engine moves an excessive amount.
It's probably the rear sway bar links. If you can jack your car up and check right behind both rear wheels you will be abale to see the sway bar which is connected to short links about 5in long with ball joints.
If either of them are broken or not connected anymore it can cause some pretty loud noises when you ride on rough roads or hit bumps. They run about $35 per link so it's not a very expensive repair.
most probably a torn lower suspension arm rubber bush that would not show up if the car was on a 4 post hoist
there is a problem there as the noise would not be evident if there was nothing wrong
different tire pressures will give different noise when hit with a tire lever ( a trick used by truck drivers to check for flat/ under inflated tires
good tire solid sound
low pressure tire a dull sound
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