Where does the brake booster pull vac on a 89+ NA

[Whizbang]

the vert i have is an 88 with s5 manifolds and either it wasn't don't right by the previous owner OR something is wrong in the braking system. The brakes feel soft and doesn't brake all that well. I am planning on bleeding the brakes once i get some funds for some fluid. But in the mean time i would like to see if the vac is hooked up right since it feels like the braking power when the car is not running.

[RotaryXperiment]

huh? ur pedal feels hard or soft when the car is running?
it shoulld pull vacuum of the uim if im not mistaking.

[djmtsu]

Do you need the FSM?

I think it pull from the UIM near the firewall, on the passenger side. I forget, and now all I have is my TII for reference.

[Max777]

On the S5 manifold, there is a metal tube that protrudes from the lower intake manifold towards the firewall, from there a thick rubber hose goes to another hard line, and the hard line goes to the brake master.

If the pedal is soft, then that means the vaccum is fine, your brakes are just mushy... If the vaccum was bad, then the pedal would be harder to press, because the brake booster isnt working, AND you would have a hella vaccum leak too!

[Whizbang]

yea i figured that. I think when the guy replaced the master, they didnt bench bleed or air bleed ANYTHING for that matter.

[Max777]

I never liked bench bleeding myself , because it's too messy, but yeah, bleeding brakes is always good.

[RotaryXperiment]

Originally Posted by Max777

I never liked bench bleeding myself , because it's too messy, but yeah, bleeding brakes is always good.

not if u used the plastic fittings and and hoses to route the fluid back into the resovoir

[Max777]

where do you get them? I couldnt find that stuff in metric.