I currently have a 2005 Sierra 1500 and have had in the past a 1995 gmc Sierra. I am now having the same brake problem that I had with the '95. When I step on the brakes I get a "growling" sound, the pedal slips a bit towards the floor board as if you are loosing the brakes but it continues to slow the vehicle and sometimes the ABS warning light comes on. Again this is the second truck with the same problem. I don't remember exactly what the issue was with '95, but this doesn't seem to be a case of normal wear. Any help or direction, or any special bulletins about this situation?Steve
Country: United StatesMake: GMCModel: Sierra 1500 Classic SLEYear: 2005Engine: 350 vortex
See my original note
is this a 4X4 or 2WD ?
yes there is a bulletin for unwanted ABS activation. most of the time the problem is the ABS sensors of how they are mounted to the front hub/bearings over time gets corrosion under them and the signals get weak and cause this.if both front hub/bearing have NO up and down play in them one hand at 12:00 and other at 6:00 then what you can do is remove both front sensors out of the hubs and clean the hub surface where they mount too down to bare metal and spray some rust inhibiting spray on that surface then remount them.most of the time we just clean the hub surface and install 2 new front sensors as allot of time the old sensors will crack coming out or break.
Thank you, XXXXX XXXXX are saying that the pedal movement when I apply the brakes is the ABS system activating because the sensors are dirty or corroded? And you say they generally just replace the sensors? Any idea of a estimated cost?
sensors are @ $ 45 each.yes the pedal movement is the ABS loosing a front wheel speed at lower speeds and it thinks a wheel is skidding when its not and will start the ABS and turn it on and you are feeling the ABS activation threw the brake pedal
GCM master tech over 25 years