boostinsc

peasodos

iTrader: (1)

Vibration when braking should be warped rotors. Since it only happens when braking it's a brake related issue not your tire balance.

DallasDave

iTrader: (1)

I had a similar situation with another car (not a Lexus). It turned out to be my new rotors. So yes, I'd encourage you to reintall your original rotors just for a quick test drive. Assuming the problem goes away with the original rotors installed, you obviously have an issue with the new ones.

When I had this problem with some EBC units, they stated that it was a rotor runout issue and was not reflective of defective rotors. Here's an article you may find interesting:

https://itstillruns.com/check-brake-...t-7458040.html

If your hubs were like mine, they were not perfectly flat (rust, debris, etc.). So it makes some sense that installing new rotors may not be perfectly "flat" and no fault of the rotor itself. Good luck and let us know what you find out.

TXMAG

iTrader: (1)

I'd pull it all apart and give the wheel hubs, pads, rotor hats, and caliper pistons a very light cleanup with a sanding block and some 600-800 grit paper. The goal here is to make sure that any surface imperfections are removed from those surfaces. Make sure to inspect pistons on the caliper and see if you notice any tears or leakage around the seals as that could be causing an issue as well. If it all looks good then hit it with some brake cleaner, wipe it down, and re-install. If you're still having the same issue after that you can try re-installing your old rotors and see if the problem follows it.

I doubt that you have warped rotors as the amount of heat required to do that isn't really seen on anything other than race cars. Hopefully the problem is just salt and road debris from driving in New York during the winter.

boostinsc

Cwang

Warped discs are often caused by idiots rattlegunning the wheels on. Check that the bolts aren't massively overtorqued, they should only require 100Nm.