Brakes and possibly transmission issue?

[MrShmack]

Seeking some advice on a few issues with my “new to me” 2003 Tahoe. There seems to be an issue with the brakes where when I’m driving the brakes like to get hard and pulsate almost but will eventually get soft and compress all the way down. I have done a little research on the forums already and have read that it could possibly be the wheel speed sensors but is there anything else? My second issue is when in drive it won’t shift at all. Almost as if every gear is just a neutral but as soon as I toggle traction control off it shifts perfectly. Lastly, the last couple of days here I’ve noticed the steering wheel wanting to jerk on acceleration from only a complete stop. It lasts about 3-4 seconds then straightens out. Could all these issues be from the wheel speed sensors? It’s a long post but any help is much appreciated so thank you in advance!

 

[Mudsport96]

Have you checked codes? Do you have any warning lights lit on the dash?

 

[MrShmack]

Have you checked codes? Do you have any warning lights lit on the dash?

No dash lights and I did check for pending codes. None unfortunately.

 

[Joseph Garcia]

I think that you need a quality bi-directional scanner and check out the operation of your ABS system.

 

[MrShmack]

I think that you need a quality bi-directional scanner and check out the operation of your ABS system.

Definitely an issue with the ABS system. Just tested a theory I had of pulling the ABS fuse. Drove fine for about 5 minutes until Traction assist turned on and it quit shifting. I turned it off and it was fine again.

 

[Fless]

Get a scanner on it that can read live data and graph all four wheel speed sensors. Compare the graphs, if not to at least rule them out.