xMJx

iTrader: (1)

Hey guys, I have a grinding noise coming from what I believe are the front brakes. It happens when I apply the brakes and sounds like the brake pad is worn out and there's metal-on-metal contact but when I checked the pads, they are at 80-90% (rears have about the same amount left). I hear it the loudest just before coming to a full stop, from about 20 mph down to stop. I thought it was caused by rust on the brakes but after I wore off the rust, the sound is still there.

Any ideas whats causing the noise? It doesn't make the noise when I make a turn, which I think some members here have and I believe is a separate issue.

XxGoKoUxX

Go on the highway, and give high pressure to the brakes, let it really grind down the rotors and LMK if it's still the same noise.

It sounds like rusting that happens on the rotors, but from what you said, you've worn it out so i'm at a stump too.

On a side note, which rotors and pads do you have?

xMJx

iTrader: (1)

I have no idea. I just bought the car and I don't know what the previous owner put on. Would glazed pads give a grinding sound?

ibidu1

iTrader: (1)

Glazed pads, and glazed rotors, not lubricated pad backings, not lubricated pins, dirt etc all can cause squealing.

The 3GS 07-up is notorious for brake squealing

Majek

I had the same issue with the front brakes. The GS's are known for an almost metal on metal noise from the front brakes eventually. I then got new rotors and pads replaced at a Lexus dealer. The service technician showed me where the noise was coming from looking at the rotor. It's the contact near the edge of the worn rotor that's making the noise. I asked to get the rotors serviced which would solve the problem, but they claimed their machine was not capable of going to the edge like that and the rotor was too thin. I didn't buy it, but I got a good deal with the brake job, so I went ahead.

I believe there was a TSB on this brake issue if your car is under warranty.

xMJx

iTrader: (1)

The rotors look new- no signs of it having been machined before.

xMJx

iTrader: (1)

It looks like there are grooves in the picture but the surface is smooth. The pic is if the front left but all rotors look the same and are smooth.

XxGoKoUxX

Oh my goodness, it looks like your rotor's about to fall off tbh..... Look at the middle hub.... There's cracks and holes there! WTH???

You might want to invest in new rotors n pads (better to get the pads done since they're cheap IMO).

That rotor looks like it'll corrode and break into pieces soon.... You don't want that at optimal driving speeds man.

ibidu1

iTrader: (1)

Yup your disc rotors are toast very unsafe to drive on, I wouldnt drive the car at all you risk doing a lot more damage and possibly an accident.

Buy new rotors all around and new pads.

XxGoKoUxX

Agreed ibidu..... The possibilities of what could happen makes me shiver! *yikes*

GS350Lexus

iTrader: (5)

Umm......... his rotors are perfectly fine, the holes on the hub is how they come stock from the dealership. Looking at the rotor surface where the pad meets, you can see some use on it. Best would be get new aftermarket pads and cut the rotors.

XxGoKoUxX

Really GS350Lexus? Now I have to go downstairs n look. I don't recall any uneven pits like that in the rotor's hub.... It seriously looks scary!

PHML

iTrader: (33)

try take a angle pic of your caliper, pad and rotor…how much meat do you have on those pads?

OKSTANCE

you are looking at about 500 for new brake rotors and pads with labor at lexus if worst comes to worst
rotors are about 115 each as i just sold a customer that service 30 mins ago. hope u get it all figured out!

GS350Lexus

iTrader: (5)

Older version of the GS350 rotors were closed in that specific area, but the new set of rotors that all GS350 come with and sold at dealership are like that. My car is currently in service, Once I get it back I will post up a pic of the rotors. I even remember EBC rotors came just like that also.