Brake Warning Light comes on when cornering - but fluid not low

I have recently had an issue with the brake warning light coming for 15 seconds or so after navigating a freeway cloverleaf etc. It doesn't come on under any other circumstances. Of course, this sounds like a low brake fluid issue (fluid moves to one side of the reservoir in the corner, causing the sensor to report the fluid is low). However, I have checked the fluid level in the reservoir, and it is very near the full line. I see no external evidence of leakage anywhere (not surprising since the fluid level in the reservoir isn't low), and the brakes work exactly as they always have.

I know the brake light can indicate problems with the traction battery (brand new, in my case), but that doesn't seem to be likely considering the consistently intermittent nature of the warning light illumination.

Does the brake warning light monitor anything else other than certain traction battery issues, brake fluid level, and the parking light being on? Is the sensor for the brake fluid level a simple float like I have seen on other vehicles? If so, has anyone ever heard of the float sticking? Any other ideas?

Thanks,

 

I'll try reading the brake codes. Is it obvious which pins are which on the connector?

It pretty much always comes on while getting onto the freeway at the beginning of my daily commute. I'll try pulling the plug from the float and seeing if the light still comes on. If the brake warning light comes on immediately when I unplug the float switch, that would mean I need to jumper the connector, correct?

 

I tried disconnecting the wires to the fluid reservoir and the brake warning light comes on, so the switch is normally closed. So I will try jumpering the connector and seeif the warning light comes on in the usual situations.

 

Hi Avi, my battery is working great, no codes, no issues at all. Thanks again.

 

Well, I feel a little silly. I guess almost full, isn't full enough. When I checked the brake fluid level, it was only about 1/8" below the full line, so I thought that was "full enough." However, I guess that is low enough to set off the warning light when cornering. I filled it right up to the line, and now the light isn't coming on any more. Because the reservoir is so large, that 1/8" I put in was actually about 1/2 pint of brake fluid.