2008 Gs 460 Brake Noise

[Captainbly100]

Has anyone else had a problem with brake noise. I get a noise just an instant before the car comes to a complete stop and then again when I take my foot off the brake pedal before touching the gas pedal. I had it in to the dealer and was told that because the car has large calipers they make noise. That sounds bogus to me. The noise is like what you get if your foot is not pressing hard enough on the pedal and the rotor slips a little in the caliper. Just a slight grind. Anyone else and if so did you get rid of it and how?

[steviej]

this is a normal sound if the pads are semi-metallic.

steviej

[The G Man]

If it sounds like the grinding you get when you 1st hit the brakes after the car has been outside after a rain storm, then your barkes are slipping. I would say they are glaze up.

[Captainbly100]

If it sounds like the grinding you get when you 1st hit the brakes after the car has been outside after a rain storm, then your barkes are slipping. I would say they are glaze up.

Thanks for the replies. I don't think it's because they're semi-metalic. I think I have semi-metalic pads on my 2002 SC 430 and they don't make the same noice. It is like what you get after a car has been sitting in wet weather for a while but it is not only when I first start up. It happens just about every time I come to a full stop and then again when I release the pedal. It's like the calipers are binding on stopping and then not releasing quickly enough when you take your foot off the pedal. I know that this car has a brake by wire system and maybe there is or will be a TSB down the road to reprogram the computer.

[Captainbly100]

I also tried something different today. I found that if I put the tranny in neutral just before stopping I don't get the brake noise. Also, if I take my foot off the brake and then put it back into drive I don't get the noise when I start moving. It's almost like the idle is too high but I don't think that can be changed because it's computer set. The car creaps a bit but not that much. Any ideas?

[Captainbly100]

I just came back from the Lexus dealer. Service manager took a ride with me and heard the noise. We also drove another brand new GS 460 and it made almost the same brake noise as mine. Maybe a little less. The manager had a technician clean out the calipers and cut the rotors (I really didn't want that but anything to try to end the noise). It seems a little better but not gone. He said that there is a regional meeting tomorrow and he would bring up the problem. I said that I had investigated it and didn't find any TSBs on this car but did find one on the 2007 GS 350 brakes. He was aware of that and seems to think that eventually there will be one for the GS 460 too. If you're having this problem also you should contact Lexus to give them a push towards a fix.

[Captainbly100]

Finally sucess! The service diagnostic specialist at my dealership called and he put on the front pads that produce less brake dust. He said the original equipment pads have a very hight Mu (coefficient of friction) factor and are very grabby and in fact, are harder than the rotors. He said that there is a TSB dated 9/24/08 (I can't find it anywhere on the net) that extends the updated reduced dust producing pads to the 2008 GS 460. He said I will lose some stopping power but I don't race this car and I just wanted it to stop normally. I just came home from having them put on and the car is perfect! It now stops like a Lexus should. If anyone is having the same problem contact your dealer.

[The G Man]

The reason why there are TSBs out there is to have the solutions on hand to the known problem. Your dealer should have fix it the 1st time, this is a very common problem among GS. BTW the high friction pads are actually softer than the low dust pads.

[Captainbly100]

Thanks for your reply. The dealer told me about the TSB for older GS's and in fact I was aware of that because I found it on line. He was certainly aware of the one for the older car. According to the diagnostic specialist and the service manager, the TSB for the 2008 GS 460 was just issued at the end of September. Of course I don't know it that is correct. All I know is the noise is gone. I do feel a slight difference in the brakes but it's not a problem at all and no noise either.

[Mazin97]

On 9/25/2008 at 1:25 AM, Captainbly100 said:Has anyone else had a problem with brake noise. I get a noise just an instant before the car comes to a complete stop and then again when I take my foot off the brake pedal before touching the gas pedal. I had it in to the dealer and was told that because the car has large calipers they make noise. That sounds bogus to me. The noise is like what you get if your foot is not pressing hard enough on the pedal and the rotor slips a little in the caliper. Just a slight grind. Anyone else and if so did you get rid of it and how?

 

On 10/15/2008 at 12:44 AM, Captainbly100 said:

Finally sucess! The service diagnostic specialist at my dealership called and he put on the front pads that produce less brake dust. He said the original equipment pads have a very hight Mu (coefficient of friction) factor and are very grabby and in fact, are harder than the rotors. He said that there is a TSB dated 9/24/08 (I can't find it anywhere on the net) that extends the updated reduced dust producing pads to the 2008 GS 460. He said I will lose some stopping power but I don't race this car and I just wanted it to stop normally. I just came home from having them put on and the car is perfect! It now stops like a Lexus should. If anyone is having the same problem contact your dealer.

Hi,

Can you please explain more what is the solution you found? Because it’s not clear for me!

 

thanks,