Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Year?, jeep, model? etc
Is this the park brake your referring to or a hybrid vehicle brake system or the abs system?
What issue are you trying to solve ??? Codes?
Or are you looking for just general diagnostic tests?? etc...