by donivan65 Fri Apr 10, 2009 10:24 pm
Its a good thing to have if you have a dual line master cylinder. Both lines from the master cylinder go through it. The idea is that if the pressure in both lines are equal, the switch in that block is in its neutral position. But if something in one of the brake lines goes wrong, unequal pressure causes the switch to ground out and make the brake light on the dash come on. And its kind of nice to know you have lost 1/2 your brakes before you find out the hard way. They sometimes tie the parking brake into this light to let you know the parking brake is on in newer vehicles. So its a good thing,,,,,you surely can leave it out when you are converting a single line to a dual line.