I have a brake light on and I'm losing brake fluid but there is no issues in my lines and brakes are still good
But if your losing fluid, you have a leak somewhere. Check around all the wheels and under the truck. Do you have brake drums in the rear? Check the wheel cylinders they tend to leak.
Also check to see if you are leaking fluid into the booster, pull the vacuum line and look for moisture and smell for brake fluid.
check master cylinder as well as the wheel's and all the plumbing,, if you're loosing brake fluid,, then you do have an issue
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