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#4718678 - 04/06/18 06:03 PM Fixed My Pulsating Brakes
Warstud Offline


Registered: 09/02/05
Posts: 5192
Loc: MIchigan
My brakes have pulsated for a while now and I've just lived with it. But recently I got a front-end alignment after I had new tires installed and now my brakes don't pulsate anymore. I wasn't aware of this...were you ?

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#4718786 - 04/06/18 07:10 PM Re: Fixed My Pulsating Brakes [Re: Warstud]
Trav Offline


Registered: 11/20/06
Posts: 18234
Loc: MA, Mittelfranken.de
Yes, its a very common and often overlooked problem. The brakes were probably not the issue in this case, but corrosion buildup on the back of the wheels where it sits on the rotor face.
You need to clean the back of the wheels especially aluminum ones. there are a few ways of doing this depending on what tools you have available and the amount of corrosion.

I use a 2" Roloc disk on an angle die grinder but a wire wheel on a drill will do, I usually finish with a 5 or 6 inch orbital sander with a 150 grit paper on low.
Hold it dead center and just move it slightly, it ensures the mounting surface is flat. Don't forget the center hole, a small wire wheel is best for this.
A smear of never seize thinly applied with a finger will prevent it from further corrosion until the wheel is removed again.
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#4718823 - 04/06/18 07:43 PM Re: Fixed My Pulsating Brakes [Re: Warstud]
ZZman Offline


Registered: 03/17/08
Posts: 5478
Loc: Michigan
I had the wife's tires rotated at Discount Tire and they rebalance them and do the above mentioned cleaning of the hub and wheel
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#4719316 - 04/07/18 09:46 AM Re: Fixed My Pulsating Brakes [Re: Trav]
Warstud Offline


Registered: 09/02/05
Posts: 5192
Loc: MIchigan
Trav....I think the front end alignment fixed my pulsating brakes.

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#4719569 - 04/07/18 02:29 PM Re: Fixed My Pulsating Brakes [Re: Warstud]
Papa Bear Offline


Registered: 08/11/05
Posts: 6997
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: Warstud
Trav....I think the front end alignment fixed my pulsating brakes.


How could that possibly be ?? ..... they are not related
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#4719639 - 04/07/18 03:50 PM Re: Fixed My Pulsating Brakes [Re: Warstud]
eljefino Offline


Registered: 06/15/03
Posts: 32377
Loc: ME
Wifes HHR got "pad deposits" on the rotors.

That awful car also had a bad intermediate steering shaft, and worn-out lower control arm bushings.

I could do a brake job and it would be mint for 500 miles. Then the slightest brake judder would get amplified by the shoddy front end.

Tight front end forced the brakes to do their own self-cleaning job and not get stuck in a harmonic resonance.

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#4720295 - 04/08/18 08:32 AM Re: Fixed My Pulsating Brakes [Re: Warstud]
grampi Offline


Registered: 10/08/06
Posts: 7578
Loc: OH
If the mounting surface was not perfectly flat when the new rotors were installed, you'd notice the pulsing brakes right away. I have pulsing brakes, but they weren't doing it right after I installed them. It came on slower over time, so I think my problem is more than likely something adhering itself on the braking surface of the rotors...

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#4720305 - 04/08/18 08:44 AM Re: Fixed My Pulsating Brakes [Re: Warstud]
SHOZ Offline


Registered: 06/28/03
Posts: 5603
Loc: Illinois
I've seen pad deposits build up slowly on the rotor and cause the wobbling. Usually if you take it out and do several hard, almost lockup 50-5 mph stops and get the rotors good and hot (smoking) it will cure the problem.
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#4721199 - 04/09/18 06:26 AM Re: Fixed My Pulsating Brakes [Re: Warstud]
Trav Offline


Registered: 11/20/06
Posts: 18234
Loc: MA, Mittelfranken.de
Originally Posted By: Warstud
My brakes have pulsated for a while now and I've just lived with it. But recently I got a front-end alignment after I had new tires installed and now my brakes don't pulsate anymore. I wasn't aware of this...were you ?


No brake work, that eliminates pad deposits and all the rest of it. They removed the wheels, balanced them and if they did it right cleaned the back of the wheels mounting area then did an alignment.
Alignment can cause or exacerbate a lot of symptoms but AFAIK not create pulsation that comes from rotating parts and what rotating part did they touch, the wheels.

Hey you might be right but I don't think so. JMHO which wont buy the morning coffee.
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#4721213 - 04/09/18 06:58 AM Re: Fixed My Pulsating Brakes [Re: SHOZ]
grampi Offline


Registered: 10/08/06
Posts: 7578
Loc: OH
Originally Posted By: SHOZ
I've seen pad deposits build up slowly on the rotor and cause the wobbling. Usually if you take it out and do several hard, almost lockup 50-5 mph stops and get the rotors good and hot (smoking) it will cure the problem.


I guess my question would be, what's in the pads that leaves deposits on the rotor? Is it cheap pads, or do they all do it?

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#4721215 - 04/09/18 07:00 AM Re: Fixed My Pulsating Brakes [Re: grampi]
SHOZ Offline


Registered: 06/28/03
Posts: 5603
Loc: Illinois
Originally Posted By: grampi
Originally Posted By: SHOZ
I've seen pad deposits build up slowly on the rotor and cause the wobbling. Usually if you take it out and do several hard, almost lockup 50-5 mph stops and get the rotors good and hot (smoking) it will cure the problem.


I guess my question would be, what's in the pads that leaves deposits on the rotor? Is it cheap pads, or do they all do it?
Cheap pads will certainly cause this but I've had the problem with quality performance brake pads too. Driving style and automatic transmissions make this worse.
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#4721323 - 04/09/18 09:09 AM Re: Fixed My Pulsating Brakes [Re: SHOZ]
grampi Offline


Registered: 10/08/06
Posts: 7578
Loc: OH
Originally Posted By: SHOZ
Originally Posted By: grampi
Originally Posted By: SHOZ
I've seen pad deposits build up slowly on the rotor and cause the wobbling. Usually if you take it out and do several hard, almost lockup 50-5 mph stops and get the rotors good and hot (smoking) it will cure the problem.


I guess my question would be, what's in the pads that leaves deposits on the rotor? Is it cheap pads, or do they all do it?
Cheap pads will certainly cause this but I've had the problem with quality performance brake pads too. Driving style and automatic transmissions make this worse.


What material is coming from the pads that adheres itself to the rotors?

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#4721526 - 04/09/18 11:41 AM Re: Fixed My Pulsating Brakes [Re: Warstud]
Vikas Offline


Registered: 07/22/05
Posts: 11207
Loc: NorthEast
After the alignment, did the mechanic took it out for a test drive? Were you in the car during the test drive?

Astute readers might figure out where I am going with this questioning :-)

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#4721939 - 04/09/18 05:42 PM Re: Fixed My Pulsating Brakes [Re: grampi]
camrydriver111 Offline


Registered: 07/01/14
Posts: 1485
Loc: Canada
Originally Posted By: grampi
If the mounting surface was not perfectly flat when the new rotors were installed, you'd notice the pulsing brakes right away. I have pulsing brakes, but they weren't doing it right after I installed them. It came on slower over time, so I think my problem is more than likely something adhering itself on the braking surface of the rotors...


I got pulsating brakes 10,000 km after I put ceramic pads on my BMW.

The piston side of the rotor was badly scored. So if the brakes are relatively new check both sides of the rotor to see what's going on.

I think it was a bad pad or perhaps I forgot to clean the anti-rust oil coating prior to installation?
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#4722897 - 04/10/18 04:32 PM Re: Fixed My Pulsating Brakes [Re: Warstud]
Warstud Offline


Registered: 09/02/05
Posts: 5192
Loc: MIchigan
It's a mystery to say the least...I removed the wheels and had the tires installed at WM. I doubt they cleaned off any corrosion off the wheel. Maybe it had to do with the uneven wear of the tires but I didn't notice the brakes working any better after the new ones were installed.

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