It is also possible you have an air leak in the braking system. The way to check that is to hold the brake pedal down and see if the pressure continues to drop after the system builds up again from the air compressor getting triggered by the initial drop you noted. Another way to tell is to have someone hold the brake pedal down while you cruise around outside listening for air leaks.
Jon
77 coach
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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