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

Whizbang · 11-05-2008, 07:55 PM

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 · 11-05-2008, 08:14 PM

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

djmtsu · 11-05-2008, 08:36 PM

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 · 11-05-2008, 09:42 PM

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 · 11-05-2008, 09:57 PM

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

Max777 · 11-05-2008, 10:03 PM

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

RotaryXperiment · 11-06-2008, 08:18 AM

Quote:

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 · 11-06-2008, 04:55 PM

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

11-05-2008, 07:55 PM	#1
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Where does the brake booster pull vac on a 89+ NA 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. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-05-2008, 08:36 PM	#3
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	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. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

11-05-2008, 09:42 PM	#4
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	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! __________________ Rotaries:They are NOT that complicated!

11-05-2008, 09:57 PM	#5
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	yea i figured that. I think when the guy replaced the master, they didnt bench bleed or air bleed ANYTHING for that matter. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

11-05-2008, 10:03 PM	#6
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	I never liked bench bleeding myself , because it's too messy, but yeah, bleeding brakes is always good. __________________ Rotaries:They are NOT that complicated!

11-05-2008, 08:14 PM	#2
RotaryXperiment Rotary Fanatic Join Date: Mar 2008 Location: Bradenton, Fl iTrader: (0) Posts: 136 Rep Power: 17	huh? ur pedal feels hard or soft when the car is running? it shoulld pull vacuum of the uim if im not mistaking.

11-06-2008, 04:55 PM	#8
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	where do you get them? I couldnt find that stuff in metric. __________________ Rotaries:They are NOT that complicated!