1998 Volvo S90

Brakes problem
1998 Volvo S90 6 cyl Two Wheel Drive Automatic 145000 miles

I have a 98 Volvo S90. My brake lights, the rear and the cab, sometimes work and sometimes don't. I have checked the fluid, the fuse - all normal. I had this problem before when my brakes were low and the fluid was very low because the brakes were low, but, as I mentioned, the fluid is fine. Is this just a case of faulty or loose wiring from the pedal? Thank you for your help in advance.
June 4, 2009.

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