Originally Posted by Mustang5L5

Simple way to test. Turn the car off. Wait, maybe 30 seconds ot a minute or so, and then press on the brakes. Do you still have a few pumps before the booster loses vacuum and the pedal firms up?

Originally Posted by coffeysm

Depends on where you bought it from really, but I don't really hear of those going bad often. You should really replace that O-ring it goes between the booster and firewall. It also comes with a packet of grease. It creates a huge vacuum leak and problems like you're mentioning when braking. That was the problem in my case at least, but YMMV.

Originally Posted by PearlPereZ

I tried it and got 2 soft firm pumps and the 3rd was pretty stiff and 4th was hard.

Originally Posted by PearlPereZ

I tried it and got 2 soft firm pumps and the 3rd was pretty stiff and 4th was hard.

Originally Posted by PearlPereZ

I tried it and got 2 soft firm pumps and the 3rd was pretty stiff and 4th was hard.