Brake Pedal Pulsing And Wheel Pulling Occasionally

[Kaeden]

Hey Guys! Hope everyone is having a good day!

I just have a quick question. Ever since I got the hoe, occasionally when I'd be coming to a stop slowly (and by slowly I mean no hard braking, just a regular stop, at a red light or stop sign for example) by the time I reach about 5mph or less, the brake pedal would pulse and the wheel would almost jerk to the right.

It's not very violent and it's not all the time, which is why it's taken me a year + of ownership to finally look into it a little. But I'm finally getting everything that was wrong with this thing fixed, and this is becoming something that is slowly annoying me more and more everyday. It's funny cause I'm so used to it that I'll get into other people's cars and anticipate theirs doing the same thing.

Any suggestions on what it could be? I've heard people caliper. I just wasn't sure. I know the calipers on it aren't OEM as they're red (don't make fun of me, they were like this when I got it). I also don't really think it's ABS related because I've replaced both front hubs about a million times (lots of 4x4 problems) and the ABS light never, ever comes on.

Thanks guys!

 

[DougAMiller]

Sounds like brake rotors are warped or worn unevenly. You can have them machined if they are still thick enough to remove the amount of metal necessary to true them up, or you can replace them. You say the calipers are OEM (are you sure they didn't just paint them?), but you didn't mention the rotors. Personally, I prefer to just replace them since AC Delco rotors are not all that expensive.

 

[Big Mama]

Any ABS or traction control lights? If not check rotors pads and calipers first. Sounds like one of the front calipers may be stuck.

 

[Kaeden]

Sounds like brake rotors are warped or worn unevenly. You can have them machined if they are still thick enough to remove the amount of metal necessary to true them up, or you can replace them. You say the calipers are OEM (are you sure they didn't just paint them?), but you didn't mention the rotors. Personally, I prefer to just replace them since AC Delco rotors are not all that expensive.

I know they're not just painted. I'm pretty sure they're Perfect Stop's "Performance" calipers. Found them on amazon and they look just like the ones that are on the vehicle.

 

[Kaeden]

Any ABS or traction control lights? If not check rotors pads and calipers first. Sounds like one of the front calipers may be stuck.

Neither. The only time I've ever had an ABS light on is when one of the hubs was bad. But as I said before, I've replaced both of them about a million times.

As far as checking rotors, if it had something to do with the rotors, wouldn't it be doing it all the time? If I have the windows down and no music playing, when the pedal starts to pulse you can hear it on the outside of the vehicle. The sound is similar to something grinding, however I'm almost positive it's not actually a grinding noise.

 

[DougAMiller]

Neither. The only time I've ever had an ABS light on is when one of the hubs was bad. But as I said before, I've replaced both of them about a million times.

As far as checking rotors, if it had something to do with the rotors, wouldn't it be doing it all the time? If I have the windows down and no music playing, when the pedal starts to pulse you can hear it on the outside of the vehicle. The sound is similar to something grinding, however I'm almost positive it's not actually a grinding noise.

My wife's Lexus needs the front rotors done (they are either warped or worn), but they are more noticeable some times than others. Depends on how much pressure you are applying. On hers, it's less noticeable if you are stopping hard than when you are slowing down more gently. You can check for unevenly worn rotors by measuring several places on the rotor with calipers to see if some areas are thicker than others. Warped rotors will have some places that spin more freely than others when you turn them by hand.

 

[Big Mama]

ABS is usually a pulsing sound almost like an impact wrench and you feel it in the pedal. If the rotor is warped enough you’d here it a lot otherwise just when it spins past the pads. Easy job to check the calipers to make sure a piston isn’t stuck. On either side.

 

[OneofFew]

Rotors warped. As to the pulling- Unless you can replicate the condition by going over uneven spots, I would attribute that to a brake imbalance. I would take the rotors off for turning/replacing and inspect the caliper slides, suspension parts and look for corrosion under the dust boot of the caliper piston.

 

[cmc76]

I have a similar thing. Its in the shop now having a small list worked on.
Allot of us seem to get that from a wheel speed sensor too.

 

[Big Mama]

Good call on the sensor. Check for loose or disconnect wires. Easy to accidentally unplug doing a brake job.

 

[Kazap]

Check and grease sliding pins on calipers. Also possibly stuck or stiff brake piston. Good luck.


Envoyé de mon iPhone en utilisant Tapatalk

 

[08HoeCD]

I watched a short video just two weeks ago on the "myth" of warped rotors. Take a look for yourself:

https://www.facebook.com/RaybestosBrandBrakes/videos/warped-rotor-myth/2174044739282278/

 

[NEECAPR]

Watching to see how things turn out on this one, guys.
Mine does this too---and it's occasional, most of the time not. Doesn't yank the wheel at all, but, it's annoying and says something's wrong.
With this problem over time I've replaced the discs, rotated the tires, replaced the calipers--even though I can't see how they'd cause it--old or new. The new discs were equal thickness within .001, but, measured about .003 runout which could say a hub problem. Don't know how close they have to be.
Most recent problem was a bad speed sensor--and the whole system let me know: ABS light and the anti-lock was pulsing always until fixed. The replacement sensors seemed to reduce frequency and intensity of the problem slightly. So, I'm wondering if the speed sensor and rotor area need better cleaning.

Still, I can't figure why this problem is just occasional--gives a whole new look at the trouble shooting chart. BTW, making the problem a little bit easier is that the problem is positively in the left front because in the increased braking part of the pulse cycle, the car pitches to the left. Plus that, it never, ever happens while testing just the emergency brake.

 

[08HoeCD]

I get the same issue sporadically/periodically, completely out of the blue. It seems to go away again within a 50-100 miles driven. It used to bug me to death----even took it to the shop and asked them to advise if I need new brakes. They said, NOPE. I stopped worrying about it.

 

[Sean James]

I've had warped rotors a few times in my life, the wobble matches your speed, high speed braking makes fast steering wheel vibration, low speed makes vehicle surge and slow steering wheel wobble.

You said kind of a grinding sound? The ABS control box has been known to make a buzzing sound when failing, as well as a chattering noise when the solenoids are going off, you could check the wiring connector going into the controller, known issues with the ground wires getting corrosion, and crimp connections getting loose.

 

[dnt1010]

Common issue you have a bad flexible brake line to the drivers side caliper. The interior lining has separated and will occasionally block the pressure or rather decrease brake fluid pressure to the drivers side causing a pull to pass side. Or vice versa. I would replace both sides and you will be good to go.

 

[Sean James]

Common issue you have a bad flexible brake line to the drivers side caliper. The interior lining has separated and will occasionally block the pressure or rather decrease brake fluid pressure to the drivers side causing a pull to pass side. Or vice versa. I would replace both sides and you will be good to go.

Darn! I forgot all about that, you are absolutely right. I've seen it at least 3 times over the years, one side hose is shot and somehow blocks fluid return or pressure. The first time took forever to figure out...before computers and youtube. Good post!

 

[Big Mama]

Nice job! My brain didn’t go there either. That’s why they say it takes a village