ABS no light but brake problem

[jeepdad]

2006 Sierra 1500 4.8 single cab long bed,  My ABS light works on dash, but does not light up indicating any problems with ABS. However when I come to a stop sign I apply brakes and they work properly (a bit of mushy travel) and the instant that the truck is going to come to a complete stop the brakes let loose momentarily and then finally catch and stop completely.   

 

I am going to bleed the brakes this weekend,  I just bought the truck a couple weeks ago, and it had this problem since I got it.  I disconnected the ABS (pulled fuse)  and the truck brakes fine.   Although as I stated the pedal is slightly mushy with a slight bit of travel .  Any ideas?

[sefiroxx]

Bleed the brakes. The fluid is hygroscopic and should be changed every 4-5 years. Then report back.

[ryank1]

You need a scan tool that shows individual wheel speed .  You will find that one of them is dropping to 0 before the others.  This is a sign of either a bad hub bearing or tone ring for the wheel speed sensor.  Either way the fix is usually to replace the hub bearing that is dropping to 0 1st.

Edited June 27, 2019 by ryank1

[jeepdad]

Thanks guys!  I have a scan tool but probably not the one I need for this.  However I plan to replace both front wheel hubs soon.  I may be ordering them today.  And a brake fluid change is in the works now too.

[riverbanks]

You could use a dvom,undo connection at wheel sensor, connect dvom to sensor wires,have meter on 2vac scale,spin tire by hand,watch meter,.35 borderline,.25 no good

[jeepdad]

thanks riverbanks!