the black condom thing inside the slave resavoir does it serve a purpose, i removed a lil while back, just wondering, i guess does it make it air tight? does it need to be there?

 

anybody know its purpose?

 

leave it in there it a diaphram

 

what does it do? please explain

 

I think you mean the rubber diaphragm in the clutch MASTER reservoir, not in the slave. The diaphragm is there to keep atmospheric air from contacting the brake fluid. Brake fluid is hygroscopic, which means it will absorb moisture from the air. Moisture reduces the boiling point of the fluid. It more of a problem with brakes, but its probably a good idea to keep the diaphragm there to prevent contamination of the fluid.

 

thanks injuneer, that might explain why its in there...but their is one in the slave, it sits around the lip under the cap and it looks similar to (sorry for lack of examples but a condom) hanging down into the bottom of the slave resavoir

 

buddy thats just a dust boot you are talking about.....put the one back in the resivour tho

 

You're still mistaking the MASTER cylinder for the slave cylinder!!! The reservoir for the clutch fluid is for the clutch "master" cylinder . The slave cylinder is what's attached to the tranny and actually operates the clutch. The master cylinder is what you operate when you push the pedal.

But yeah, for both the brake and clutch master cylinder reservoirs, you should leave those rubber "diaphragms" in place ... it's basically like a glorified gasket/seal .

 

so it holds pressure? and keeps moisture from gettin in? i just took it out a while back when tryin to bleed the clutch, then i couldent figure out how you were supposed to have fluid in it because it pushes out almost all the fluid when you put it back in

 

Let's make sure we are talking about the same thing.

The clutch master cylinder is bolted to the fire wall. Above the master cylinder, also on the firewall, is a translucent white reservoir, with a cap on it, and a black rubber diaphragm to searate the fluid from the air. It does not contain any pressure at all. It keeps the brake fluid from absorbing excessive water, in the form of humidity from the air that enters the cap of the reservoir. The rubber diaphragm should "float" on top of the surface of the brake fluid. You don't push it down into the fluid. If the fluid to too high to allow you to insert the diaphragm, you take a little fluid out with a syringe.

The clutch slave cylinder is bolted to an aluminum cup on the driver's side of the bell housing. The end if it has a rod coming out of it, to push on the clutch fork. There is a rubber dust boot on the rod. There is no "cap" on the slave cylinder.

You need all the components.... if you didn't, you can be sure the GM bean counters wouldn't have let the engineers put them on the system.

 

lol, thankyou, i say slave reservoir and mean the clutch master...the white reservoir, the black rubber diadiaphragm is what i was wondering about...i cant seem to get my clutch to grab down near the floor like it used to, the line had a leak so i replaced it, then i bleed it and it still has about 3/8 to halfway up before it starts to grab very well...it burns sometimes when iim speeding up rapidly and go into say 3rd and the gas at the same time, it does gab as hard and quick as id like, wondering if that diaphragm helt pressure or something. now i know i just need to bleed it more!

 

Where can i find this sleeve? Mine is torn