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Brake Pulsing

Brake Pulsing

Postby SierraTime [OP] » Mar 29 2021, 7:41pm

I have a 2000 GMC sierra 1500 that I changed the front rotors and pads on. After around 3k miles on them, I started to get bad brake pulsation. I was shocked because I went with Bendix for both the rotors and pads. I cleaned the rotor and hub mating surfaces and torqued the lugs to spec. I did notice that when I first start driving for the day the pulsing is gone and as I drive longer it gets worse. Much worse after harder braking. Then the next day it's the same story.
The brake hoses have never been replaced, I figured they should probably be done since the truck has 200k+ miles on it.

I feel the pulsing through the pedal and as I'm braking the truck lurches to a stop but only after everything has had time to heat up.

Thanks in advance for the responses!
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Re: Brake Pulsing

Postby SierraTime [OP] » Mar 29 2021, 7:42pm

To add-in, I have been searching through forums and researching this problem for the past week.
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Re: Brake Pulsing

Postby Z15 » Mar 29 2021, 8:42pm

Warped rotors. The rotors may not be sitting flat on the hubs, not running true, corrosion on the mating surfaces. Did you check for runout? Improper torquing of the lug nuts can cause rotors to warp.

Note, no matter the brand name they have several levels of quality, the cheaper ones seem to all come from China no matter the brand name.
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Re: Brake Pulsing

Postby SierraTime [OP] » Mar 29 2021, 9:00pm

I haven't checked for runout. I cleaned the hubs and rotors with a wire brush and sanded the surface a bit to get the rust off. I torque the lugs to the proper rating. I got the mid-level rotors and pads from Bendix.
What doesn't make sense to me is that the pulsing happens after I've been driving for a while.

Thanks for the response!
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Re: Brake Pulsing

Postby chevron » Mar 29 2021, 9:27pm

You feel it in the pedal and not the steering wheel? Makes me want to look at the rear brakes too.
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Re: Brake Pulsing

Postby Chevy-SSChevy-SS is online! » Mar 29 2021, 9:28pm

Step 1: check the runouts. Here's a short little vid that shows exactly how to do it
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Re: Brake Pulsing

Postby SierraTime [OP] » Apr 01 2021, 3:12pm

Thanks for the responses and suggestions!
I'll have to check runout when I get a chance along with checking out the rears.
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Re: Brake Pulsing

Postby SierraTime [OP] » Apr 13 2021, 11:58pm

Alright, I finally found some time.
I checked the runout of the front rotors and they were under .001" runout for both.
I've moved on to the back and have new drums coming later this week and will try to put them on this weekend.
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