Jon Ross Posted July 27, 2010 Share Posted July 27, 2010 Hey guys, I have a 99 GS300 and only when I hit some decent bumps there is a banging noise that comes from what seems to be the right front wheel. It's not hard banging, but you can hear it in the car. I pulled everything off, shook the car, pulled and pushed on everything and could not replicate the sound. Only when I drive and hit some decent bumps i can hear it. On normal bumps and dips you can't hear anything at all. I have a new upper control arm and replaced the hub bearing and it's still there. I went under the car and put a wrench on all the bolts i could and it's still there. Before I go further, is there a common part that can cause this noise on these cars, or someplace I should focus on first? I appreciate any help I can get. Quote Link to comment Share on other sites More sharing options...
intakerGS Posted July 27, 2010 Share Posted July 27, 2010 Manually pulling and pushing parts won't always provide for the necessary G's, as you state it only happens when you hit a decent bump. There are some usual suspects to investigate: - worn upper strut mount (perhaps need tightening) - worn lower ball joint(s) and/or outer tie rods. - 'loose' sway bar bolts - worn engine and/or tranny mounts Does the noise also occur when you hit a decent bump and brake? Quote Link to comment Share on other sites More sharing options...
Jon Ross Posted July 27, 2010 Author Share Posted July 27, 2010 Yeah, applying the brakes doesn't make it stop, so I counted out the caliper and bracket. I double checked the bolts anyway. I checked both uppper strut mounts and they were tight. Someone else mentioned the sway bar end links and bolts, so I will check that tomorrow. Think I might also just go ahead and replace the lower ball joint while I'm there. Quote Link to comment Share on other sites More sharing options...
1UZJAY Posted July 28, 2010 Share Posted July 28, 2010 I'll tell you what. I've had this problem since I first got my GS. I get mine when going in and out of a parking spot; basically it feels like when I apply the brakes that my pass side caliper it 'activating' before my driver side does. I've changed out: - All brake pads - Slide pins on the caliper - Front sway bar bushings with daizen bushings - Rear sway bar bushings with daizen bushings - Front end bushings with daizen bushings - Steering rack bushings with daizen bushings - Brand new lower control arm #1's on each side with daizen bushings - New rotors all around - New upper front control arms - New front outer toe control rods - New front lower ball joint - New inner tie rods - New oem brake fit kits both front and rear I can't even remember the rest but basically most of my parts are brand spanking new. I even have new parts in the rear. I changed out my suspension with full coilovers, etc. I realized when I changed my brakes the noise went away for a bit then came back. I've tightened all bolts to spec using lexus manuals, etc and still have the issue. I've read alot and some say its a floating caliper/braking system design and that the stock/oem pads are made to counteract this. I'm going to check it one more time before I sell the car because its driving me insane. Quote Link to comment Share on other sites More sharing options...
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