I recently purchased a 2010 GX460 and am replacing the pads and rotors. The front was not a problem, but I could not get the rotor off on the back passenger side. I decided to have a shop do the back brakes with my parts while it was in for a tire replacement. I received the vehicle back after they closed on a Friday and noticed a light metal scraping sound. I took it back in the following Monday morning, and they could see that the inside brake hardware was rubbing on the inside side of the rotor. The entire rotor is off-center in the caliper mount (see pictures), like the hat of the rotor is too deep. They had already thrown away the boxes and old parts, so I don't have anything to compare them to. My initial thought was that the caliper mounts were switched by the shop but after trying them on both sides I've had no luck. The pad hardware was rubbing so I bought some slightly lower profile (about 1mm) pad clips, but it still rubs.

After checking part numbers and dimensions a dozen times, I can confirm I have the correct pads and rotors are correct for this vehicle. I am using BOSCH Quiet Cast Rear Rotors (50011636) and Pads (BC976), also I confirmed Dualast and NAPA rotors have the same issues.

I have no idea what to do from here, I have never heard of this issue.

Any help would be appreciated. Let me know if I can provide any additional pictures.

 

Junk hardware. Replace the hardware and it should be fine. If you're in a pinch, just file it down.

 

Thanks for the reply.

The hardware may be part of the issue, but something else is happening that would explain why the rotor is off-center in the mount.

 

Cannot see centering issue per your comments. Those are the Stainless Steel inserts (to the Calipers) that the Brake Pads slide on ... providing a smooth surface for proper Brake Pad movement. Yes, they do not appear to be evenly positioned relative to the rotor ... but assume they are OEM parts so should properly fit into position on the caliper if fully seated.

What I do see is that the Brake Pads were "lubricated" using "Anti-Squeal Paste" instead of the proper high-temp grease. The former is intended to be specifically applied between the Brake Pad and the Stainless Steel Backing Shim to reduce noise due to vibration when applying the brakes.

The Anti-Squeal-Paste is WAY TOO THICK for the above purpose ... and actually comes close to hardening once cured ... so if applied to the location pictured ... the Brake Pads will not back off properly when the brake pedal is released ... causing the Brake Pads to drag on the rotors.

 

Is the brake caliper moving freely on the sliding pins?

I would start checking that all parts that need to move can so freely without any resistance, as its hard to believe that that Bosh is that much off, not saying it could not happen

 

That is ceramic Extreme Brake Parts Lubricant by Permetex. And yes, it is too thick since I have not wiped it down yet.

 

Thank you for the reply. The brake caliper does move on the pins. Unfortunately, I am running into this issue with the fixed parts before the caliper even goes back on. The shop initially blamed the Bosch rotors, but after testing two other brands, I'm pretty sure the rotor is correct, and something else is wrong.

I was thinking the caliper mounts, or where they connect to the axel, could be bent, but it seems unlikely that both sides would be bent exactly the same.

 

Permatex Ceramic Extreme Brake Parts Lubricant is Purple ... not Orange.

 

Thanks, everyone, for your assistance with this. I friend took apart his GX460 and confirmed that the rotor is not centered in the bracket. His pad hardware was also bent at 90 degrees to be flush with the inside of the caliper mount, so I bent mine out to match. The clearance on the one inside is still less than 1 mm and a few mm on the other.

Basically, Romanova was correct the hardware from both Bosch and Duralast is "junk" or at least is not tailored to this application.

I will post if there are any related issues in the future.

 

Mine is orange.