brake problem 911

[Live4Boost]

I just installed vacuum brakes on my 87 gn and now i am having problems with the breaks. I have the s10 drums in the back with soft shoes. When i first hit the break it feels like it hits something and then will go down towards the floor more. Also i can't hold any boost at all. All the lines are bled.

Please help

 

[alec296]

are the rear brakes adjust up?
sounds like you might have a bad master cyl unless you dont have
the wheel cyl pins to shoes properly
andy

 

[Live4Boost]

Yes the rear brakes are adjusted and working properly. I was kinda thinking master cylinder too. I made another post on this in the general turbo forum under the same title. If you read that one I have alot more info there of the problem and I would be interested to see if you still think its the master after reading all that.

Thanks

Bob