So i recently had new front rotors and pads put on my G37x Coupe. Everything was fine until one morning on the highway i started to get a really bad shake - i thought i had a flat tire - when i pulled over i saw smoke coming from the front passenger wheel which smelled like burned brake pads. I was able to drive the car slowly home on the back roads and then had it towed to the dealer.

The dealer said it appeared to be moisture in my brake lines/fluid that caused the caliper to compress and caused it to sort of lock the brakes up.

I did a brake fluid flush and had to have the rotors resurfaced since they had a slight warp to them.

Now the issue is - every now and then i get a "ting" sound like metal hitting the brake shield and then scratching it like nails on a chalk board. It then sounds like the brake pad is rubbing the rotor. If i drive for a little bit it ends up going away. I want to say it happens more if it has rained outside - even though i park in a garage. It almost sounds as if the brake pad pops out of the clip and rubs against the rotor or the brake dust shield on the back of the rotor.

I was able to record a video of the sound today.
https://www.dropbox.com/s/f5m0wpzysr...%2039%20PM.mov
(Sound needs to be turned up to hear the noise)

Let me know what you guys think...

 

Sticky pistons maybe? Only passenger side? How many miles on them? Did you use brake cleaner to clean the caliper? Grease the pads and pins? The pads should hug the rotors very gently but not to the point that there's noise from the friction at such speed. Also check the dust shield and make sure it's not having contacts with the rotor.

 

If I were you, I would just go to your local auto parts store and get a replacement caliper. It seems like this is more of a caliper issue/heat shield issue than a pad issue. It won't cost too much, especially if you do the work yourself.

Good Luck!

 

There are two ways to address this.
First, remove the wheels, brake pad pins and pads. Using brake cleaner and a toothbrush, clean all the caliper grease and brake dust and other crap from inside the caliper. You can SLIGHTLY press on the brake pedal to move the caliper piston out a little when you do this, you'll just have to press it back in with something plastic or wood so you don't damage it. Take you brake reservoir cap off temporarily if you do this. Then reapply the brake pad anti-chatter lube to the pads and also put a thin coat on the brake pad guide pins. Since you seem to have a sticky piston, pushing it out with the pedal, then back in with wood or plastic will probably break free whatever is causing it to stick.

If this doesn't work, you didn't waste your time. Instead of spending big bucks on a new caliper, just purchase a caliper rebuild kit. They are cheap and you can do the job on your work bench with basic tools. A rebuild kit is just new o-rings and a new bleeder valve. Buy a brake line crimp tool, crimp the line at the rubber line as close as possible to the caliper. Remove and disassemble the caliper. Clean the pistons as necessary using SCRATCH FREE abrasives. Like a blue scotch-Brite pad, reassemble, install and bleed the brakes.
That's the difference in a $600 caliper vs a $50 rebuild kit, and either way, you still have to bleed your brakes.

I may be missing some steps, but PM me if you need any help.

Nate

 

Ok, so it looks like its possible the lower slider pin that is getting stuck. I found a TSB that shows updated pins are available that do not have the rubber sleeve at the end of the pin. Ordered the newer pin so hopefully that will solve the problem.