hard pedal on brakes

I have a 96 4x4 and the brakes work good if I step on the pedal normally. If I do a "panic" stop or hit the pedal quickly, it's hard as a rock and they don't work right away. Sorta feels like the engine is off and there is no vacuum asssist but, no matter how hard I hit the pedal the brakes won't come on for about a 1/2 second. Have vacuum at the booster and holds vacuum (how much?). Replaced the brakes and fluid this weekend but, only because it needed it. The problem was before that. I was thinking the booster, because the engine changes when I press the pedal and the pedal will drop if I speed up the engine. After reading Doc's trouble I started getting worried, except that once the brakes come on I can stand on it and it stops like it should. Thanks for any advice. David

Reply to
David
Loading thread data ...

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.