Just curious, are you sure the 65 booster is for a mustang? Back then each model used a different booster with separate apply rates. Also get a gauge and check your engine vacuum, you mentioned hard to engage at idle. Did you get booster with a matching master cylinder? Or use the original master cyl? Some of the boosters had an adjustable push rod in the booster, check its' height against factory specs. Also test booster operation. With engine shut off, pump the brake pedal at least six times to exhaust the vacuum, on the last pump hold the pedal down keep good pressure on it, now start the car pedal should go down at least another inch as you hold pressure on it. Just a few ideas, hope it'some help
Friday, February 9th, 2007 AT 10:10 PM