https://youtube.com/shorts/YhvOw5evxs8?si=fmPPCMCtnmh6kj9f
Hey there!
My 2015 Lexus RX350 (FWD, 156,500 miles) started making this awfully loud shaking/vibrating noise whenever I hit the brake past about 25% depressed driving at highway speeds. I did some looking into it and the pads have plenty of life in them, and the rotors don’t look too obviously worn either. Looking past that into the suspension, some of the ball joints or other components look obviously old, but not worn. The front driver shock/strut boot is torn, but the vehicle’s ride isn’t effected (still that Lexus ride) so I’m not sure if it would be that.
Of course I’m going to replace everything when I can, I’m in the military and don’t have too much time to pull everything apart all at once, so I’m just wondering what the most likely main culprit would be so I can replace that and then get to everything else when I can.
It (the noise) seems to be at its loudest on that front driver side, which is why I pulled that wheel off. If I can figure it out I’ll post a video attached to this, I’m hoping I can.
Any help would be greatly appreciated, thanks!
*UPDATE* So it turns out, I discovered that it also makes this noise over some heavier bumps, primarily on the driver’s side but occasionally bumps on the passenger side also make the driver’s side noise as well.
Check all your suspension components for wear, at that mileage it would not be unusual for parts to wear out. Also check bearings for wear. Brake rotor runout can be tested with a dial indicator.
@chucktobias any suggestions on parts to start with? The only part that’s visibly worn is that dust boot on the strut I mentioned in my original post. I think I can knock out steering since there’s no shake in the steering wheel and the brakes because there’s no shake in the pedal.
any suggestions on parts to start with?
In general we don't favor the parts cannon approach here. Unless something is obviously broken like a leaking radiator we don't say what part to replace, but instead advise testing suspect parts before replacement. I would probably check ball joints, wheel bearings, and control arm bushings to start with. Also make sure there is no wear in your inner and outer tie rod ends.
@chucktobias I understand, I apologize. I wasn’t looking for an end all be all answer, just a general idea of where to start looking for wear. I greatly appreciate the help and will look at the bearings, ball joints and control arms, as well as measure the rotors when I can. Thank you!