76 Brake Booster Problem?

[76 PTO]

I Have A 76 Booster That I Took Oof To Clean Up And Reinstall On My Resto Project And I Noticed That When I Push Down On The Pedal Side Input Shaft I Can Hear A Hiss On The Mc Side When The Booster Extends Back Out. I Can Make The Hiss Worse By Wobbleing The Mc Side Shaft. Is My6 Booster Bad Or Is There A Different Way To Test It Out Of The Vehical? I Dont Know If It Is Bad Because That Side Seals Against The Mc, But I Think Im Just Being Hopefull. If It Is Bad I Heard I Could Get A Mini Truck Or Even A Celica Booster For It And It Would Work Fine. What Year Mini Truck Or Celica. I Know That The 76 Is The Expensive One To Rebuild. The Part # Is Master Vac 285186.419240. Any Help Would Be Appreciated.

 

[Cruiserdrew]

Yours is bad. Do a search using my user name and brake booster. I was able to get it rebuilt and it works great. Not cheap tho...

 

[76 PTO]

I Was Able To Use A Small Vacumm To Suck On The Check Valve And It Held Vacumm Fo A Min Or So

 

[4x4Poet]

I Was Able To Use A Small Vacumm To Suck On The Check Valve And It Held Vacumm Fo A Min Or So

Try the vacuum gauge with the brake pedal activated through it's range in case the booster's diaphram leaks more when flexed under pedal pressure.