Higher mileage cars can develop creaking and groaning noises in the front suspension, particularly when coming to a quick stop. Inspection and replacement of any worn parts should correct this concern.Google+
Car Problem Reports
Lexus LS400 Higher Mileage Cars May Develop Noises in Front Suspension
Lexus LS400 Problem
Average Mileage: 156,099 mi (98,000 mi - 217,350 mi)
Visitor, 1996 Lexus LS400, 115,000 mi
Hello: I had same problem when my 1996 lexus LS 400 would hit a 2 " or so curb loud clunk sound. Had several shops look for problem, when one mechanic finally found the problem. It was the control arm struts in the front. They are the rods that run from the lower control arm straight up into the front of car. They have a bushing pressed into them from the factory that cracks over time and causes that clunking sound. Follow the rod all the way up to where it attaches in the front use a flashlight, and you'll see the cracks in those bushings. Pull the cover down if you have to, to see what I'm talking about. That's your problem. I ordered both of my fronts from ----Auto parts warehouse.com they are around $120.00 a piece. Easy to put on bye bye clunk. My best to you Mike
i hear noises when i step on the brakes like a creaking sound
Visitor, 1999 Lexus LS400, 206,000 mi
A loud clunk from the front suspension whenever driving onto a 2 inch bump, driveway entrance, etc.
Visitor, 1998 Lexus LS400, 134,000 mi
Car was not staying locked on its path of travel. Had to constantly correct with steering. Fixed this by replacing a bad drive side ball joint.
Both front ball joints (Lexus P/N 4333059026, either side) were completely worn out, almost an 1/8" of play in them. *REPLACE THEM* safety concern.
I had also ordered the 2 "strut" bushings (Lexus P/N 4867450030) that mount at the front of the car to replace after reading online that they fail after high miles, mine were usable but the rubber was starting to tear so I replaced them anyway.
Upper control arms can cause the noise also, you can't just replace the ball joint and the complete arm cost $500 from Lexus per side.
The engine and transmission mounts could be warn also, the tranny mount is cheap and easy to replace, engine mounts not so easy.
If getting a clunk in the rear suspension aftermarket bushing ADUS 505 may fix it, about $35 each, order qty. 2. The rubber in both of my original bushings was COMPLETELY gone and the metal sleeves were just flopping around. I think the rear carrier arm is the part the bushings go into, not too bad of a job if you have decent mechanical skills, if not, don't attempt.
Front end made a "clunking" noise when I went over bumps.
Replaced left and right ball joints..problem solved.
Visitor, 1994 Lexus LS400, 100,000 mi
Haven't had it fixed yet
Visitor, 2000 Lexus LS400, 98,000 mi
2006 IS 250. Noise from fronts suspension. Bushings replaced. Problem corrected.