Break pedal is hard, but slow stop.

[Paukert11]

Alright guys, I have replaced my pads and rotors and bled the breaks. But when I step on the brake, the car doesn't slow down for shit. Mean while my car idles a little weird when its stopped and I stick it in revurs. It trys to die. The only think that comes to my mind is a bad Break booster. What do you guys think.

[jlevie]

A hard pedal means that the booster isn't working. That could be a bad booster or a lack of vacuum. From the way the engine behaves the odds are that there are intake leaks, which will reduce the vacuum available for the booster. A smoke test of the intake will tell if there are leaks and where they are. If the hard pedal persists after fixing the intake leaks the booster check valve or the booster (or both) are bad.

[fronton]

Were the brakes working correctly before the maintenance you did? If they were, it seems unlikely that the booster just happened to die while changing your pads and rotors. But I agree, it does sound like a bad booster or vacuum issue. Did you mess with the MC, changeover valve or booster at all or only change pads, rotors and bleed? Did you pressure bleed, how much pressure?

Also, please spell brakes correctly so it makes sense.

[Paukert11]

I did not mess with the MC or Booster. I Just did an old fashion bleed with the pedal. Im getting a smoke machine tonight to check for leaks.

[jlevie]

In case you aren't familiar with a smoke test, the procedure is:

Plug the exhaust and insert the adapter for smoke injection where the AFM connects. Then feed in smoke until you have a pressure in the intake of 2-3psi. Hold that pressure for at least 5 minutes to allow the smoke to reach all leaks.

[Paukert11]

Thanks jlevie, I was about to ask that next. lol

[Paukert11]

OK so I did a smoke test and the smoke was coming from the throttle body side wholes. where the mettal fittings are for the brake booster. Where is the best place to but the check valve and hose? Pelican doesn't have them for some odd reason.

[Paukert11]

I found out that its the brake booster.

[jlevie]

OK so I did a smoke test and the smoke was coming from the throttle body side wholes. where the mettal fittings are for the brake booster. Where is the best place to but the check valve and hose? Pelican doesn't have them for some odd reason.

That is a common problem. The fittings were pressed in and over time they loosen. Clean the nipples and bores well with acetone or lacquer thinner and use JBWeld to secure them. Allow the epoxy to set overnight w/o starting the engine.