Tapping no8se coming out of back hatch

Chevrolet Blazer 1999 La 4 door 1999 blazer 100000 miles
Every time I apply the brakes I get a tapping noise coming from the back hatch...just started when I disconnected the back wiper...sounds like a pump of some sort trying to pump the fluid for the back wipet
Blonde from Canada 9 years ago  
BL
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