My ABS light has been on and off for a long while. I got a code that told me it was the Brake Pressure Sensor. But that's a $250 item and I'm not 100% sure that's the problem.
The light comes on almost all the time except when its under 40f outside. Also when it's warm out but raining hard it won't come on. Would temperature effect the density of the fluid that much?
I live in Florida so it's warm out most of the time.
Any ideas?

 

Hello,

In a word yes brake fluid does have a boiling temp and as you live in warm climate your fluid will reach its higher temp more quickly have you tried replace the fluid with new? Although your weather is usually dry and sunny there is still moisture in the air which will also reduce the fluids density.

Best of luck.

 

I changed the rotors, pads, and fluid in the last two months. I think I'll change out the speed sensors all round. See if that helps.

 

I have a similar problem. I have a 2004 X-Type and I live in Las Vegas, my ABS light has started coming on but only when the temperature is above 90.