my 03 chevy

chevtrxrck · 06-29-2009, 05:11 PM

i replaced drivers side hub. and used new abs cable and now when i hit my brakes its a pulsating feel. like you get when you hit a bump while presing brakes what did i do

**wrench97** · 06-29-2009, 05:43 PM

Unless it runs on MicroSoft Vista your in the wrong forum:)
I'll move you over to Automotive Support.
Check that the wheel is tight and the wheel bearings are tight.

chevtrxrck · 06-29-2009, 06:07 PM

do you think thats the problem or could it be the abs cable. how do i do that take the hub back off if it was new could that still be the case.

**mack1** · 06-29-2009, 09:19 PM

Hi chevtrxrck and welcome to TSF,

If the problem didn't exist before you changed the hub, I would take a closer look at the new hub installation. The ABS only pluses when the signal from the left front, right front or the rear axle is not in sync with the other two. Inside each of the two front hubs is a gear that the ABS sensors look at to determine rotation. Normally the rear wheels are handles with one sensor which is mounted on the rear of the transmission. It looks at the output shaft to know that the rear wheels are rotating. Same sensor is usually used for vehicle speed. All three of theses signals go to the PCM.

Hope this helps,
Mack1

chevtrxrck · 06-30-2009, 05:39 PM

so obvisouly the front assem i put on may not be tight enough or what. somebody else said it was the bearings, but thats what i replaced so what do i need to do to fix it.

**mack1** · 06-30-2009, 05:53 PM

Is your ABS light on?

chevtrxrck · 07-01-2009, 04:58 PM

yes and sometimes it says service break system

**mack1** · 07-01-2009, 06:45 PM

Quote:

yes and sometimes it says service break system

This strongly points to the ABS trying to function (the pulsing you feel on the brake pedal). To stop the pulsing, the front wheel sensors and the speed sensor from the rear of the transmission have to produce the same number of pluses per revolution of the wheels. If your speedometer works, then the problem is with one of the wheel sensors and I would have to guess that it is the one that you replaced.

Quote:

used new abs cable

Was that the short cable at the pickup sensor? It usually disconnects just above the wheel on the Aframe. You need to make sure that it has a good connection there. See if you can unplug it and measure the resistance of the sensor. It should measure about 800 to 1000 ohms.

Best regards,
Mack1

06-29-2009, 05:11 PM	#1 (permalink)
chevtrxrck Registered User Join Date: Jun 2009 Location: kentucky Posts: 4 OS: xp	my 03 chevy i replaced drivers side hub. and used new abs cable and now when i hit my brakes its a pulsating feel. like you get when you hit a bump while presing brakes what did i do

06-29-2009, 05:43 PM	#2 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Posts: 17,868 OS: XPSP3	Re: my 03 chevy Unless it runs on MicroSoft Vista your in the wrong forum:) I'll move you over to Automotive Support. Check that the wheel is tight and the wheel bearings are tight. __________________ Power Supply and Selection

06-29-2009, 06:07 PM	#3 (permalink)
chevtrxrck Registered User Join Date: Jun 2009 Location: kentucky Posts: 4 OS: xp	Re: my 03 chevy do you think thats the problem or could it be the abs cable. how do i do that take the hub back off if it was new could that still be the case. Last edited by chevtrxrck; 06-29-2009 at 06:20 PM. Reason: more info

06-29-2009, 09:19 PM	#4 (permalink)
mack1 TSF Articles Team Join Date: Nov 2007 Location: Texarkana, Texas Posts: 1,245 OS: xp sp3 My System	Re: my 03 chevy Hi chevtrxrck and welcome to TSF, If the problem didn't exist before you changed the hub, I would take a closer look at the new hub installation. The ABS only pluses when the signal from the left front, right front or the rear axle is not in sync with the other two. Inside each of the two front hubs is a gear that the ABS sensors look at to determine rotation. Normally the rear wheels are handles with one sensor which is mounted on the rear of the transmission. It looks at the output shaft to know that the rear wheels are rotating. Same sensor is usually used for vehicle speed. All three of theses signals go to the PCM. Hope this helps, Mack1 __________________ "If you like yourself others will like you also" me "Don't drink downstream from the herd" Will Rogers Submit New Articles Here

06-30-2009, 05:39 PM	#5 (permalink)
chevtrxrck Registered User Join Date: Jun 2009 Location: kentucky Posts: 4 OS: xp	Re: my 03 chevy so obvisouly the front assem i put on may not be tight enough or what. somebody else said it was the bearings, but thats what i replaced so what do i need to do to fix it.

06-30-2009, 05:53 PM	#6 (permalink)
mack1 TSF Articles Team Join Date: Nov 2007 Location: Texarkana, Texas Posts: 1,245 OS: xp sp3 My System	Re: my 03 chevy Is your ABS light on? __________________ "If you like yourself others will like you also" me "Don't drink downstream from the herd" Will Rogers Submit New Articles Here

07-01-2009, 04:58 PM	#7 (permalink)
chevtrxrck Registered User Join Date: Jun 2009 Location: kentucky Posts: 4 OS: xp	Re: my 03 chevy yes and sometimes it says service break system