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Old 07-19-2013, 10:58 AM
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Wk pulsing while braking

Hello Everyone,

WK noob here. I recently purchased my first Wk, 09 3.7L V6 Brilliant Black with 69k miles almost a month ago. Ive only put just over 1k miles on it when it started pulsing during braking, it kinda feels like the brakes are gripping then letting go but ever so slightly and its only felt at slow speeds. Its not a vibrating feeling. I dont feel it in the pedal, its the whole vehicle (I can feel myself lurch forward just a bit) so I believe it might be warped rotor. Ill be ordering a clamping dial indicator to test the rotors for runout but I was looking for any other ideas of what it might be. Any input is greatly appreciated.

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Old 07-19-2013, 02:17 PM
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Re: Wk pulsing while braking

warped rotor or air in the brake fluid would be my guesses
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Old 07-19-2013, 02:44 PM
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Re: Wk pulsing while braking

thickness variation in the rotor... the repair would be new rotors or have your current ones machined.
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Old 07-19-2013, 04:40 PM
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Re: Wk pulsing while braking

This is more than likely caused by "hot spots" on the rotors, and is really quite common. They can also happen for the reasons ID'ed above too, or excessive grooving/irregular wear patterns. Hot spots happen predominantly on the front rotors, as they take the brunt of the braking load and generate much more heat than the rears. If there are spots on both front rotors, the "pulsing" can come and go or it may even move the steering wheel back and forth (shimmy) when braking, depending if the rotor rotation is in sync or out of sync with each other. You'll also probably notice it more at higher speeds (may even get a good shutter/vibration) than lower speeds (mostly surging/pulsing). You should also be able to see these "hot spots" on the rotors, by looking between the spokes in the wheels. They will appear as bluish colored spots, some round, some elongated. They can be machined out, but usually return in short order, because the spots had been "hardened" previously and, unless you can completely machine them out, you'll be back where you started. I've got a small amount on mine, and I'll just drive it until it irritates me too much, or I wear the brakes out, whichever comes first. When you replace rotors, make sure you get good OEM quality (or better), and not the Chinese (low cost) ones. Some of those, new, are worse than what you take off. Been there, done that.
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Old 07-19-2013, 05:13 PM
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Thumbs up Re: Wk pulsing while braking

I had this problem I hope I fixed it I just replaced my front rotors looks like hot spots I will take a picture of my rotors let you see this. I have not tested them to tired from replacing rotors , was a easy job with the right tools back soon
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Old 07-19-2013, 05:18 PM
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Here picture of my rotors I changed today

ForumRunner_20130719_181803.png



ForumRunner_20130719_181822.png
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Old 07-19-2013, 05:34 PM
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Re: Wk pulsing while braking

Chris, can you get a closer pix of some of those hot spots? Looks like you have some long ones there. Also, what kind of rotors did you put on? Where were they made? What kind of pad did you use?
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Old 07-19-2013, 05:39 PM
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Re: Wk pulsing while braking

Quote:
Originally Posted by jeepgcoman View Post
Chris, can you get a closer pix of some of those hot spots? Looks like you have some long ones there.
Will do heading to dinner, my brake pedal pulsed like crazy lite braking and hard braking.
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Old 07-19-2013, 10:04 PM
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Re: Wk pulsing while braking

Thanks for the info everyone. Ill probably wait till it gets real annoying before I tackle it with a complete rotor swap.
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Old 07-20-2013, 09:09 AM
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Re: Wk pulsing while braking

Mine did that too before installing new rotors and pads. I went with Centric solid rotors from Tirerack, not costly and very high quality..Centric is a division of Stoptech.
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Old 07-20-2013, 09:15 AM
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Thumbs up Re: Wk pulsing while braking

I installed Centric rotors and Wagner Thermo pads, my front pads factory had cracks in them the back did not look that bad. So your front rotors looked like my set? I got about 45k out of the rotors.
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Old 07-20-2013, 09:16 AM
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Re: Wk pulsing while braking

rotor problem , i've seen it on WJ we machined the rotors and since then no problem
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