Pulsating brakes even with new rotors. Why?

[JBeezy]

I've experienced this with my new brake setup and my last brake setup which was new. Could it be that I'm bedding the pads incorrectly. I always go out and get the car up to speed, then brake hard. Then I repeat this 4-5 times. Should I not do that? Last setup was brand new rotors and pads and got the same results. Worn parts? Everything checks out good when I get an alignment. Car has 56k miles.

Opinions needed. Thanks in advance

[jwibbity]

I've experienced this with my new brake setup and my last brake setup which was new. Could it be that I'm bedding the pads incorrectly. I always go out and get the car up to speed, then brake hard. Then I repeat this 4-5 times. Should I not do that? Opinions needed. Thanks in advance

Its also important what you do after you're done slamming on the brakes......

[JBeezy]

Its also important what you do after you're done slamming on the brakes......
I bring the car to a hard stop, then get it back up to speed. How do you bed your pads?

[jwibbity]

I bring the car to a hard stop, then get it back up to speed. How do you bed your pads?

When I installed the R1 concepts rotors and pads it came with instructions for the process with included several 50-0 hard brakes but also included 2 cooling cycles.

What I meant by after was not sitting at stop lights or any extended breaking period after the hard brakes

[JBeezy]

Yea, I usually drive a mile to this long highway that's usually pretty empty. I may get my new rotors turned while I have it all took apart and start over. I'm thinking I'm bedding them wrong

[Bob Mathis]

I have a little all so. But may run mine more before I do anything.

[JBeezy]

I have a little all so. But may run mine more before I do anything.
When I bought the car at 30k miles it had this. I replaced rotors and still had it. Now my new brakes have it. Makes me wonder if it's something other than rotors.

[Fastbob]

Did you use a torque wrench to tighten the lugs to the correct torque? Over tightening can cause warped rotors.

[BigM460]

I think it's possibly some pad transfer. My folks get this with there Lincoln. Have had them when traveling down the highway to drag the brake just a little hard while still maintaining speed for a little bit. Foot on gas and brake at same time. Nothing major, but braking, then continue down the road without touching the brakes allowing them to cool. Seems to pull/drag it off pretty well as my Mom worries about everything, and she hasn't complained anymore!
Hope it works for you if you try it!

[RubberCtyRauder]

Do you have the TCE stainless lines?May also be some bulging brake line adding to it.

[loud2004marquis]

May also be some bulging brake line adding to it.

^^^What he said^^^

Had a 1999 F-150 and the calipers would start locking up here and there, would shake the truck pretty hard. Looked on some forums and found that it's a pretty common problem. I had to replace the calipers and the lines, problem was solved.

[lji372]

Lifespeed will chime in shortly and school you :run:

[Logizyme]

Slightly bent front hub

The RF on my CVPI is bent. New rotors pulsate, but if I machine them on-car they are good to go.

You could try measuring runout on the front hub, or just try on-car machining.

Good thing front hub/bearings are cheap and easy to replace.

[Logizyme]

Lifespeed will chime in shortly and school you :run:

HAHA Someone lock the thread before he gets in here ;)

[lji372]

I saw that on car machine on a British tv show. I have never seen a shop around me with it. I thought it was an awesome way to do it, true it perfect every time :2thumbs:

[JBeezy]

Do you have the TCE stainless lines?May also be some bulging brake line adding to it.
New rotors, tce lines, pads, and calipers

[justbob]

I have never once bedded a set of brakes on any car nor had issues of pulsation. I do scuff up the rotors prior to install. Perhaps stop the bedding.


Builder Of Badassery

[JBeezy]

I have never once bedded a set of brakes on any car nor had issues of pulsation. I do scuff up the rotors prior to install. Perhaps stop the bedding.


Builder Of Badassery
That's what I'm thinking also

[Zack]

I have never once bedded a set of brakes on any car nor had issues of pulsation. I do scuff up the rotors prior to install. Perhaps stop the bedding.


Builder Of Badassery

This.

Bedding a pad is absolutely pointless.

[tbone]

Maybe the hub(s) have corrosion or other crap on them and the rotors aren't mounting true. Few ever think to check this before they slap new rotors on. Me included.

[J-MAN]

Lifespeed will chime in shortly and school you :run:

Where's the like button?

[MOTOWN]

I have never once bedded a set of brakes on any car nor had issues of pulsation. I do scuff up the rotors prior to install. Perhaps stop the bedding.


Builder Of Badassery

I agree, i have never bedded brakes either

[Wags]

Have you checked the rear rotors as well? Don't know if you have replaced those as well. Warped rear rotors will also pulsate when stopping and sometimes hard to tell if front or rear causing it.

Wags

[JBeezy]

Have you checked the rear rotors as well? Don't know if you have replaced those as well. Warped rear rotors will also pulsate when stopping and sometimes hard to tell if front or rear causing it.

Wags
Never checked rear. Been thinking of getting rotors to match the front anyway. Went ahead and ordered some rear rotors. I'll see what happens when I get my wheels back.

[fastblackmerc]

Pulsating in the seat = rear brakes

Pulsating in the steering wheel = front brakes.

[JBeezy]

If i remember correctly it wasn't in the stearing wheel. I could just feel it when coming to a stop.

[fastblackmerc]

If i remember correctly it wasn't in the stearing wheel. I could just feel it when coming to a stop.

Could be the rear brakes shoes fell apart or are worn out.

[RubberCtyRauder]

Do the ebrake shoes and hardware as well if doing rears

[JBeezy]

Do the ebrake shoes and hardware as well if doing rears
More info. On hardware. I've never even swapped rear pads on this thing in 26k miles. They still look good. So far I'm replacing pads and rotors. What's left?

[JBeezy]

I think you guys are correct about the bedding crap. Took my rotors in to have them checked and they were slightly out. Told the guy about them and he said my bedding process was not needed. Will not be doing that anymore.

[Badass_forever]

I think you guys are correct about the bedding crap. Took my rotors in to have them checked and they were slightly out. Told the guy about them and he said my bedding process was not needed. Will not be doing that anymore.


Ok, I can't read anymore of this, its called burnishing for the love of baby jesus.

[JBeezy]

Ok, I can't read anymore of this, its called burnishing for the love of baby jesus.
Lol! Good stuff

[JBeezy]

Well my car is back on the road. Brakes are smooth as silk and stopping well. No issues other than figuring out what I'm going to do about the rust strip at the bottom of the rotor. Wouldn't have had that problem if I wouldn't have had the rotors turned lol. Oh well

[Green96]

The comment about pad transfer is true. if you bed in the pads don't come to a complete stop. Letting the pads sit in one spot after a hard stop will leave a heavy deposit of friction material. same is true for normal driving. Try to leave some room to scoot up at the end of your stop.

I also prefer slotted rotors. Not for the performance (there is not real benefit as far as I can tell), but I feel like it keeps the pads from glazing. I am starting to pick up a slight pulsation in the pedal at 70K. I am almost positive it is coming from the rears which are the original rotors.

[JBeezy]

I didn't bed them at all. Drove normal and no issues. They stop great and no pulsating