Brake warning light

[possum328]

Not sure if this is in the right forum but here goes. The brake warning light in the IC of my 2004 Suburban is constantly on, but very dim. It is barely visible even in total darkness. Brake fluid is up, but old. Electrical or brake issue, your thoughts?

 

[andyd]

check the alternator output

 

[eljefino]

Does the light get brighter when you use the e-brake?

What if you disconnect the level sensor on the master cylinder?

 

[old1]

If it is that dim, are you sure it isn't just picking up some residual light from some other bulb.

 

[possum328]

Originally Posted By: old1
If it is that dim, are you sure it isn't just picking up some residual light from some other bulb.

Yes because it glows even with ignition off and key out

 

[possum328]

Originally Posted By: eljefino
Does the light get brighter when you use the e-brake?

What if you disconnect the level sensor on the master cylinder?

It does get brighter when I use the parking brake.

 

[possum328]

Originally Posted By: andyd
check the alternator output
. I just notified it after I replaced the battery last week, coincidence?

 

[SHOZ]

Probably a bad sensor. Ford had cars burning up while parked because of this. Not to worry you or anything.....

 

[dishdude]

Originally Posted By: SHOZ
Probably a bad sensor. Ford had cars burning up while parked because of this. Not to worry you or anything.....


That was because Ford ran voltage through the switch for the cruise control, not an issue in this application.

 

[HerrStig]

There's some current leakage around the switch. Pull the lead and see of the light goes out.