Screaming brake booster

[volver]

When i start my X in the morning i can drive for 100 feet then i hear a loud screaming sound come from the engine compartment. It sounds like a rabbit getting killed. Or roughly 1000 babies going through a wood chiper. It last for 2 seconds then stops. Happens when it sits over night or after really hard braking, like trying to avoid hitting someones a dog hard braking or while braking going down step hills. Does not happen when it sits out all day.

i was thinking it could be the brake booster.

anyone have any ideas

 

[97_rednecksport]

it has a bad brake booster

 

[Blee1099]

You sure its the brake booster, using a screwdriver place it on the booster and start the truck.. If you can heart the noise thru the screwdriver then its it.. I suspect it may be something else like the IAC, intake, etc..

 

[volver]

i dont think it is the IAC it is a really loud noise. Tt doesn't seem like the ICA is capable of making this noise either

 

[team]

unplug the brake booster vacuum hose, plug the hose and see if it still screams.