So whenever I go 100+km/h on the highway or anywhere else and I step on the breaks, you can hear this rattling noise. I can also feel it on the break paddle. This only occurs at high speeds.

I had my rotors and brembos replaces like 3k kms ago.

i didnt have this issue before replacing them.


I want to know two things,
1. What's the problem obviously
2. Is it safe for me to drive at high speeds with this issue

 

67 views no replies.
guess ill just die when the breaks stop working. lol

 

Even though the rotors were replaced, I have heard that once in a while even a new set might need to be resurfaced or at least inspected to be within spec. before installing them. I had this issue on my old Honda after replacing the rotors and pads, found out the new rotors were warped but my mechanic noticed it during some maintenance I had done and he threw in the resurfacing with the deal. If it is not the rotors, then I am at a loss.

 

You could be experiencing a caliper issue. You can experience pulsating/strong vibration and perhaps thats causing the "rattling".

 

i paid $1.7k for rotors+pads to be replaced.
they better not charge me to fix the **** work they did

 

holy hell, i hope you got some stop tech slotted rotors atleast with some top of the line pads because that is absolutely rediculous

 

Seriously rediculous price. I was in a pinch and needed a quick solution to get me buy and went to autozone to get all rotors and pads and only cost me less than 200.

 

Had you given our members a little more information you may have received an answer sooner. Had you said your steering wheel jerks back and forth when stopping at high speed the answer is obvious....warped rotors. With new rotors this issue is caused by the forging process, not allowing them to cool long enough! If this happened with a few miles on them the cause might be installing your wheels with an impact gun, over tightening the lugs. Always install your wheels with a torque wrench, allow nothing else!
Gary

 

I don't really think it's warped rotors.

I hear that warping your rotors with street driving is incredibly hard to do. You'd need to be doing some track to even get close to warping them.

Chances are there's just gunk that is layering itself onto your rotors in uneven spots.

Such as coming off a freeway offramp and hitting a light at the end. Your brakes get hot stopping from 70-80mph to 0mph and holding the pads at that spot for sometimes up to 1 minute at the light. Which is what causes the pads to sort of cook onto the rotors.

Like I said, this is what I heard. But it seems more likely that material is just cooking itself onto the rotors, rather than the rotor itself actually warping out of shape.

 

You hear? If you've never delt with warped rotors you'd know it's not uncommon and caused by the two factors I stated above. Never assume what you hear is the correct information. Gunk layering your rotors in uneven spots....that's some funny ****!
Gary

 

So ummm. This is from STOPTECH.

http://www.stoptech.com/technical-su...nd-other-myths

4th paragraph.

"In fact every case of "warped brake disc" that I have investigated, whether on a racing car or a street car, has turned out to be friction pad material transferred unevenly to the surface of the disc. This uneven deposition results in thickness variation (TV) or run-out due to hot spotting that occurred at elevated temperatures."

 

Yes. Me funny guy indeed.

 

Taken from the same Stoptech link.

"Other than proper break in, as mentioned above, never leave your foot on the brake pedal after you have used the brakes hard. This is not usually a problem on public roads simply because, under normal conditions, the brakes have time to cool before you bring the car to a stop (unless, like me, you live at the bottom of a long steep hill). In any kind of racing, including autocross and "driving days" it is crucial. Regardless of friction material, clamping the pads to a hot stationary disc will result in material transfer and discernible "brake roughness". What is worse, the pad will leave the telltale imprint or outline on the disc and your sin will be visible to all and sundry."

Slowing at a freeway off ramp is probably the hardest for your brakes in everyday street driving, and potentially the hottest it gets. Especially if you're going 80+ and the offramp is short. And you do leave your foot on the brake if there is a stoplight at the end of that offramp. Which is when it's most likely to leave a deposit of pad material onto your rotor.

 

I'm sorry to hear your car breaks at high speed.

You could try using some emery on your brake rotors to eliminate the uneven transfer of material. Better yet, take it back to the installers and make them fix or replace the parts.

 

Using the correct bed in process where material from the pad is evenly distributed on the surface of the rotors I seriously doubt you'd have a build up on the rotors during heavy braking. I've done some major canyon runs here in SoCal up to 100 mph and heavy braking for hours and never had rotor issues of any kind. Regardless of what you've heard or read, pad material won't cause the warped rotor issues that makes your steering wheel vibrate back and forth during heavy braking!
Gary