2003 Suburban Brakes Pulsing

[chevsuz12]

Hi, my 03 suburbans brakes are intermittantly pulsing, but only after slowing and near a complete stop then pulse. The initial brake bite and feel is excellent. But when almost stopped they pulse for a second or so then work fine.

 

I since checked the front brakes discs and rotors look great, and are original with 40,000 miles.

 

I checked the rear, they were worn pretty bad, I replaced discs and rotors. The pulses still continue. Could this be a sensor issue?

 

Any help is appreciated.

 

Thanks.

[Zembonez]

Front rotors need to be turned. They are slightly warped. Very common problem after many many heat and cool cycles on disc brake vehicles. Should be a really easy fix.

[minibike132]

Front rotors need to be turned. They are slightly warped. Very common problem after many many heat and cool cycles on disc brake vehicles. Should be a really easy fix.

 

Could be Jim but I think he might be describing an abs activation as a pulsation. There is a bulliten on unwanted low speed abs activation and it's pretty common. We are currently on bulliten posting lock down but I'm sure you can find a copy if you are a good with a search.

[chevsuz12]

Thanks, found the bulletin. I will clean the sensors, and see what happens.

[chevsuz12]

Guys, thanks for your help. Found the bulletin, pulled out all wheel sensors and they all looked like new. No corrosion at all. The things I have done to attempt to resolve this problem are the following:

 

Replaced rear rotors and pads.

Inspected front rotors and pads (have some wear but not bad, and pads have a lot of life left.)

Inspected wheel sensors.

 

Yesterday, it finally caused another problem, after weeks of the pulsing while coming to a stop, the pedal went to the floor and the system displayed "SERVICE BRAKE SYSTEM" also displayed ABS, and BRAKE idiot lights.

 

I don't want to go replacing everything until I find the problem, but not sure what else to do. I am thinking of replacing front brake rotors and pads next. For the time being I pulled the Brake Fuse, the pulsing stopped.

 

Any other opinions?

 

 

Thanks.

[chevsuz12]

HELP!

 

Now I have changed front and rear rotors and pads, and of course the ABS is still activating. The brakes feel excellent, as it is about to come to a complete stop the brakes pulse. Feels as if ABS is falsely activating.

 

If I pull the brake fuse, problem goes away. So if all brakes are replaced, then what could the problem be?

 

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[minibike132]

My best guess is your going to need to replace the sensors. There isn't a good way of telling without some testing. I couldn't begin to tell you how to do that at home.

[pennzoil29]

My best guess is your going to need to replace the sensors. There isn't a good way of telling without some testing. I couldn't begin to tell you how to do that at home.

 

IMO, that's what sucks about all this new technology,(sensors,etc), the life of the backyard wrench monkey is pretty much non-existant.

[abracadabra]

HELP!

 

Now I have changed front and rear rotors and pads, and of course the ABS is still activating. The brakes feel excellent, as it is about to come to a complete stop the brakes pulse. Feels as if ABS is falsely activating.

 

If I pull the brake fuse, problem goes away. So if all brakes are replaced, then what could the problem be?

 

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

Had a similiar problem with a Dodge.  All the ABS sensors were ok, but the exciter ring was cracked which gave two teeth on the ring a wider than normal gap.  This would activate the ABS on that wheel when the vehicle slowed to below 10mph.  Had to replace the hub on that one.