Jwmaurer

When you bleed with the mity vac are u putting the jay tool on top of the cup or inserting the end into the reservoir hole? And while pumping it does ur pedal pressures engagement point start to drop while doing this?

therobman

iTrader: (39)

i dont really get this method if u shove the nozzel in the hole and create vaccum with the pump i understand it will be pulling air from the master and slave when u pump the pedal but its obviously pulling fluid what keeps it from running dry with fluid? since if u have the nozzle in the hole it doesnt matter how much fluid is in the cup

Duffster

iTrader: (103)

if you've got the nozzle IN the hole TIGHT, it seals it and doesn't pull from the reservoir. You can't keep a 10-12" vacuum if you're not in the hole TIGHT...

therobman

iTrader: (39)

o ok so dont use a nozzle that totally seals the hole and use 10-12 of vaccum and it will just keep the nozzle in the hole

Duffster

iTrader: (103)

if you don't seal the hole... you'll just empty the reservoir. . . mission NOT accomplished...

Duffster

iTrader: (103)

JAM the nozzle down firmly into the hole (such that it seals it and stays on it's own)

therobman

iTrader: (39)

ok but if the hole is sealed then obv is pulling the fluid thats in the slave and master wont it empty out with 10-12 of vaccum

Duffster

iTrader: (103)

The point is to create a vacuum condition that draws the air towards it. It isn't to empty the reservoir, it isn't to empty the line. It's to make the bubbles come towards the vac. . .

TTAFORMULA

i am having a serious issue with my hydraulic system intermittently failing on me, i replaced the slave, the master and line. i would bleed it the normal way and it would work great/drive fine for a day. next day pedal feels a little firmer and car wont go into gear. i tried the mighty vac method and when i pump the vac up to 10-12hg the needle starts to drop, so while my buddy pumps the pedal i increase the vacuum (not going above 12hg) but the needle still drops slowly. then the car goes into gear as if i got the air outta the line. i also noticed the canister on the mighty vac doesnt seal that great either, please give me some insight as to what is happening here.

BobP

iTrader: (1)

I can't solve it for you, but if the Mity Vac is losing vacuum, it's pulling air from somewhere. Do you have a universal cap or GM specific?

BobP

TTAFORMULA

you mean the cap on my reservoir or the cap on the mighty vac? the cap on my reservoir is the gm factory cap, but the cap on the mighty vac seems to suck in air since it has a crappy design to lock the cap onto the canister, almost like a prescription canister. i did the bleeding according to the way i saw in the first post. is anyone else having this problem with their mighty vac? stupid hydraulics.......

BobP

iTrader: (1)

I meant the reservoir cap - if you have the GM cap, it's less likely to be the culprit. I know what you mean about where the hose clip attaches to the Mity Vac cap. I've seen them leak there. If that's it, a little ring clamp should permit a tighter fit.

BobP

TTAFORMULA

It leaks from the cap it sounds like. At about 7-12hg. Its not threaded, one cap has no slots on top and one is a plain cap w/ no holes. I'm using the plain one. Maybe its defective like my ride.

Fry_

ttt. I know it's 5yrs old but it saved my *** so i'm giv ing it a dump for anybody that's never seen it.

Torque Fiend

iTrader: (6)

so when you pump the mityvac to 10-12 in Hg, it doesn't stay there, correct? The needle starts going down, and we just have to keep pumping to keep at 10-12 in Hg?

Torque Fiend

iTrader: (6)

Anyone?

Fry_

I have to pump it closer to 15" before it seals to the bottom of my reservoir but you still have to pump it a little bit as it pulls air out.

Bama99z

iTrader: (7)

I replaced the master cylinder on a buddies 99 TA last night. We tried to blead it manually with no success. However I stumbled onto this thread this morning. Sounds like alot of people have used it with much success. I will continue with it later on today. Wish me luck, and thanks againg to Tech.

BALLSS

good luck, I found this thread when I put in the McLeod MC with my twin. For me it did not work, just sucked all the fluid out of the MC at any PSI. 5, 10, 15 it didn't matter.

With that said I have a "custom" pedal/hydraulic set up and use F-body hydraulics in my B-body. This makes the "inlet" of fluid into the MC from resovoir at a position where air can get traped in MC as it it not at the highest point. I wound up pulling my entire hydraulic/pedal assembly out to bench bleed.

You may have better luck as a Mighty Vac should induce vacuum and draw the air bubbles out. Maybe it works better on LS vs the LT1 pull style system