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for a 90' Ranger 4x2.....Not the most mechanically inclined...if my rotors were too thin it could cause excessive caliper travel to them and my brake fluid level could dip below the sensors level causing my brake light to come on? The manual says it will only come only if the parking brake is on or the fluid is too low. Fluid is full & my float is working fine...help!
Are the saying the light comes on & goes off when you apply the brakes? I would doubt the problem is related to the rotor thickness since the caliper will still travel the same distance. I would look for a problem in the rear brakes or line leak first then look at the master cyl. I am assumingthat the pedel is good & no air in the system.
Likely a rear wheel cylinder leaking or one of the flexible lines for the front wheels. Either way a truck that age should have both the flex lines and the wheel cylinders replaced and it wouldn't hurt none to flush the whole system. Brakes are very important and many folks take them for granted.
Another possible problem may be in the line that runs along the frame to the back wheels. Mine rusted and failed a couple of years ago. If I remember right it was nearly 110" long from the RABS module to the where she connects at the rear axle. My Ranger is a scab though!! Easiest way to get to it for replacement is to take the bed off instead of dropping the gas tank. Much easier!