5500 Duramax brake warning light/chime

Greenlawn Racing · 09-06-2008, 10:32 AM

We are in Hastings, NE for a motorcycle race in an RV equipped with a Duramax.

As we were backing into our spot, the brake warning light came on as well as the chimes.

Any idea what it could be? It appears that there is pressure on the air tank, and the master cylinder has plenty of fluid.

**Tow Master** · 09-08-2008, 01:08 AM

Welcome to the Forum!!!

Ya could be a number of things. Try unplugging the electrical sensor on the master cylinder. It measures the fluid level. Also, does the brake lights all work?

azredsled · 09-12-2008, 04:27 PM

on my C4500 i had a problem with the switch on the brake pedel . this switch is about 2" by 4" inches and mount to the brake pedel in the cab under the dash white in color
is the elec. brake pump working or did it stop as well
this switch is a very commen problem with these trucks ....always start with the simple things
might check this switch