I am not sure that I am describing this correctly but it seems that the calipers of our 2004 GX tend to get pressurized every few minutes. It may also be related to the ABS. There is a very slight clunk followed by a couple seconds of slight vibration on the brake pedal and a faint buzz. I have always experienced this with other cars, including our LS430, only once after the engine start. But this occurs continueously (every 5 minutes or so) with the GX after the engine starts and while driving around.

Has anyone else experienced this problem or is this considered normal for the GX?

 

I have had a 2003 GX (60,000 miles) and now have a new 2005 GX. Plus I have driven other GX models over the last two years. I have never experienced what you are describing on any of these vehicles.

 

It's normal, others have mentioned this and I also feel it, just got use to it and now ignor it. Don't worry about it. Some of us just have more sensitive feet then others.

 

Everyone has talked about vibrations and clunking but in a totally different context. I have never heard of or experienced this in the brake peddle every few minutes. Odd... I would have the dealer check it out to make sure there isn't something wrong with the brakes like a leak or something that causes it to lose pressure in the lines.

 

I notice that too in my 2004- I guess that I'm just starting to ignore it!

 

That's weird Haven't felt that in the GS, ES or my truck and I consider myself sensitive to every squeak, sound and vibration. The strangest sound I have heard on a Lexus was the noise coming off the Z rated tires on the GS400.

 

I may have experienced something similar, although I never felt it in the pedals.

It almost sounds/feels similar to when the A/C compressor engages, but you hear a faint buzz.

I experienced it in my '98 LC, and when I mentioned it to the dealer they told me it was normal. I also experience it in my '04 LC. It's not as noticeable and maybe it's because of improved sound deadening, but it's still there.

I think I hear that it is some sort of pressurization. Nonetheless, since I've experienced it in two cars, the dealer was most likely correct.

 

Noticed a faint vibration whenever I stepped on the brakes, as if the ABS was activated ever so slightly. I suppose that's a normal thing for this vehicle?

 

Mine doesn't occur at the moment I step on the brake. I've only noticed it WHILE I have my foot on the brake. Small but important difference.