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ABS light came on after changing the front pads??? WTF

hoorders

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hoorders Enthusiast

hoorders

Posted
Posted

Hey everyone,

 

I changed the front pads on my 93 Yukon. When I put it all back together to go for a test drive the ABS light was on in the dash and wont shut off. I pulled the wheels back off to see if by chance if I accidently unplugged one or something and it all looks fine. Anyone had this happen? This one has me stumped. I even checked for a possible blown fuse, and the fuse panel under the dash has no ABS fuse. The only fuse block under the hood is the one mounted to the fire wall and it too does not indicate an ABS fuse. The ABS was perfectly fine till I changed the front pads.

Any help would be very much appreciated!!!!

GasHog369 Senior Enthusiast

GasHog369

Posted
Posted

wheel sensor could be dirty or it could be bad and just happened to go when you messed with the pads.

 

Ive had both my sensors go on me , and actuallly the one twice..

1997SierraSLT Enthusiast

1997SierraSLT

Posted
Posted

I bled my brakes recently on my 97' K1500 and had the same thing happen. All I can figure is air somehow got entrapped in the lines. Bled the brakes a second time and that solved the problem. I would assume in your case, the act of depressing the cylinder back into the caliper bore caused air pockets to form in the lines.

1997SierraSLT Enthusiast

1997SierraSLT

Posted
Posted

Had same scenario happen to me on my 97' K1500 after bleeding the brakes. Air must have somehow got entrapped in the lines. Bled brakes again and it solved the problem. I'm guessing in the act of depressing the cylincer back into caliper bore, air entered the lines.

hoorders Enthusiast

hoorders

Posted
  • Author
Posted

I bled my brakes recently on my 97' K1500 and had the same thing happen. All I can figure is air somehow got entrapped in the lines. Bled the brakes a second time and that solved the problem. I would assume in your case, the act of depressing the cylinder back into the caliper bore caused air pockets to form in the lines.

 

Why would air in thelines cause the ABS light to come on? I didnt think the ABS sensor had any corrolation with the brake lines. I thought the sensor was only related to the wheel and would only activate based on wheel lock up. Well. I will try and bleed the brakes and see if it works.

 

Thanks.

Duelin Enthusiast

Duelin

Posted
Posted

There is always the possibility that you pushed dirty brake fluid back up into the ABS Module and the servos are not in the center position. If this is the case you will need a by-directional scanner to cycle the servos and and get them in the center position.

Debo511 Enthusiast

Debo511

Posted
Posted

There is always the possibility that you pushed dirty brake fluid back up into the ABS Module and the servos are not in the center position. If this is the case you will need a by-directional scanner to cycle the servos and and get them in the center position.

 

 

More times than not if this happened you will be replacing the BPMV. Always open the bleeder when pushing the piston back in.

  • 2 months later...
jseabolt Enthusiast

jseabolt

Posted
Posted

I've read if you install pads on a vehicle with ABS, your supposed to open the bleeder screw as you push the piston back in or it will mess something up with the ABS sensors.

 

I normally do this but seems like I've done it the typical way on my wife's Nissan Z car and didn't had any issues afterwards. Maybe I got lucky.

 

.

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