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ABS pulsates when braking at speeds over 45

7 messages,  Last post on Oct 17, 2010 at 3:58 PM

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What is this discussion about? Pontiac Bonneville, Sedan

Messages Page 2 of 2

#2 of 7 Re: ABS pulsates when braking at speeds over 45 [carriesguy] by imidazol97

Oct 12, 2010 (7:27 am)

Replying to: carriesguy (Oct 11, 2010 6:34 pm)
Is the tire the same brand and size as the others? IS THE PRESSURE SET THE SAME?
 
When braking does the ABS indicator light come on showing it's intentially cycling one or more of the wheels?
 
Is the sound the Brrrrrr sound of the brakes pulsing ( I know it probably is, but I had to ask!)?
 
When you reset the tire pressure system, did you do it while the car was rolling? Had the car been sitting in the sun so one wheel was very hot and higher in pressure and the other was cool? Then when you're driving later, the system senses a difference in rotational speed?
 
I know of a new Buick where the dealer replaced a defective tire with a different width tire, e.g., 205 with 195 or 215. That would occasionally give a brake system light when they turning into the downhill driveway and the weight shifted to the front tires.

#3 of 7 Re: ABS pulsates when braking at speeds over 45 [imidazol97] by carriesguy

Oct 12, 2010 (12:41 pm)

Replying to: imidazol97 (Oct 12, 2010 7:27 am)
Same size not brand. Pressures all same. Reset while setting still. No sun. Drove 30 min. prior to cheching pressures and reseting.

#4 of 7 Re: ABS pulsates when braking at speeds over 45 [carriesguy] by imidazol97

Oct 12, 2010 (3:43 pm)

Replying to: carriesguy (Oct 12, 2010 12:41 pm)
Next step for me would be take out the fuse for the ABS system. Then drive the car a few days and see what behavior your get.
 
If behavior had disappeared then reinsert fuse and have checked to see which input sensor is giving wrong impulse.

#5 of 7 Re: ABS pulsates when braking at speeds over 45 [imidazol97] by carriesguy

Oct 13, 2010 (6:20 pm)

Replying to: imidazol97 (Oct 12, 2010 3:43 pm)
OK Did The Fuse. Never did get a error code tho. Will drive then report findings.

#6 of 7 Re: ABS pulsates when braking at speeds over 45 [carriesguy] by carriesguy

Oct 17, 2010 (3:31 pm)

Replying to: carriesguy (Oct 13, 2010 6:20 pm)
ok put the fuse back in problem came back. Going to try bleeding the abs pump.

#7 of 7 Re: ABS pulsates when braking at speeds over 45 [carriesguy] by imidazol97

Oct 17, 2010 (3:58 pm)

Replying to: carriesguy (Oct 17, 2010 3:31 pm)
I believe the Tech II or a few other units that are similar can actually cycle on the ABS pump as a way of bleeding it.

Messages Page 2 of 2

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