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post #1 of 14 (permalink) Old 05-11-2012, 12:35 PM Thread Starter
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Pulsating brakes

08 Hemi--front brake rotors and brakes done at 32,000 mi, now have 36,000 and the brakes pulsate when lightly using. Seems to be intermittent. Any ideas why?

Thanks,

BCB
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post #2 of 14 (permalink) Old 05-13-2012, 07:54 PM
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If something was broke it wouldn't be intermittent it would happen all the time. Maybe the caliper bolts or something worked it's way loose with only 6k miles it's possible. Pulsing brakes are usually wrapped rotors but like I said it would always do it. Do you hear any other noises when it happens the abs kicking on would feel like that sometimes to.


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post #3 of 14 (permalink) Old 05-14-2012, 09:32 AM Thread Starter
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Quote:
Originally Posted by SAL-XK View Post
If something was broke it wouldn't be intermittent it would happen all the time. Maybe the caliper bolts or something worked it's way loose with only 6k miles it's possible. Pulsing brakes are usually wrapped rotors but like I said it would always do it. Do you hear any other noises when it happens the abs kicking on would feel like that sometimes to.
Thanks--everything is tight--it almost feels like the ABS is being actuated. I am hoping to get a few ideas before I run to the dealer.

BCB
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post #4 of 14 (permalink) Old 05-14-2012, 11:35 AM
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I would bet your rotors are warped. You either have to get the rotors resurfaced or buy new rotors. Even though the pulsating feeling is intermediate, you can still have bad rotors.

All vehicles that I had driven with "warped" rotors always pulsated more at certain speeds and sometimes never pulsated at other speeds.

Read Robby's post regarding the term warped rotors.
https://www.jeepcommander.com/forums/...8&postcount=27

His post can be found in this thread.
https://www.jeepcommander.com/forums/...ead.php?t=9868

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post #5 of 14 (permalink) Old 05-15-2012, 08:14 AM Thread Starter
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Quote:
Originally Posted by bob123 View Post
I would bet your rotors are warped. You either have to get the rotors resurfaced or buy new rotors. Even though the pulsating feeling is intermediate, you can still have bad rotors.

All vehicles that I had driven with "warped" rotors always pulsated more at certain speeds and sometimes never pulsated at other speeds.

Read Robby's post regarding the term warped rotors.
https://www.jeepcommander.com/forums/...8&postcount=27

His post can be found in this thread.
https://www.jeepcommander.com/forums/...ead.php?t=9868
Thanks Bob123--I did not know that my brake system had a rear bias--all my previous GC's were definately front biased--It feels like the rear brake rotors might be the problem--will pull them today and see. Thanks for Rob's link.

BCB
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post #6 of 14 (permalink) Old 05-15-2012, 03:24 PM
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After I resurfaced my front rotors the pulsating feeling went away, however, the vibration in the steering wheel is back at certain speeds.

I should have replaced the front rotors instead of resurfacing them.

I always focus more on the front rotors since most of the braking occurs in the front. Just my two cents.

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post #7 of 14 (permalink) Old 05-15-2012, 04:37 PM Thread Starter
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Quote:
Originally Posted by bob123 View Post
After I resurfaced my front rotors the pulsating feeling went away, however, the vibration in the steering wheel is back at certain speeds.

I should have replaced the front rotors instead of resurfacing them.

I always focus more on the front rotors since most of the braking occurs in the front. Just my two cents.
Rear discs were warped--first time this has happened to any vehicle I've owned and I average 180,000 miles 'till trade

BCB
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post #8 of 14 (permalink) Old 05-15-2012, 06:25 PM
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How did you determine that your rear rotors were warped? I believe shops use some type of measurement system to see how "wavy" a rotor is.

Let us know how your brake experience goes.

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post #9 of 14 (permalink) Old 05-16-2012, 07:07 AM
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Number one reason brake rotors get warped - people do not torque the lug nuts! If ALL lug nuts are not torqued to the same setting the rotor will warp over time - it takes a while for the damage to show up.

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post #10 of 14 (permalink) Old 05-16-2012, 12:04 PM
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Quote:
Originally Posted by rblapham View Post
Number one reason brake rotors get warped - people do not torque the lug nuts! If ALL lug nuts are not torqued to the same setting the rotor will warp over time - it takes a while for the damage to show up.
That is not how the rotors get warped.

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