Shark Lover

I have been doing some searches and just want to make sure I don't miss anything. I am going to rebuilt my clutch master cylinder (due to leaking fluid on my carpet) with the overhaul kit and I was told to go ahead and replace the slave cylinder, and also to change my brake fluid to ATE blue. Is there anything else I should look into? Thanks everyone for you help.

GlenL

Replacing the slave cylinder is good. Do a search on bleeding the clutch system as it is a tricky operation; a standard bleed doesn't work.

Going to ATE "super blue" brake fluid only makes sense if you are going to run your car on a track. Otherwise any DOT3 or DOT4 fluid for the corner parts store will suffice. A good time to do a complete flush of that system as you'll need to drain the brake fluid reservior.

FlyingDog

The nice thing about changing to ATE blue or gold is that you know when you've fully flushed out the old fluid. Other than that, Glen is right.

worf928

Spec books call for DOT3 through '89 and DOT4 after '90.

deliriousga

Watch it with the ATE Blue unless you're on the track or in a pretty warm climate. I put it in the 928 and the Boxster and when it's 40F or lower outside, the pressure is not high enough to push the clutch arm back all the way and the gears are a little sticky. When it's warm outside, everything's great. I'm going to the ATE gold since it's more for street cars.

You might want to think about changing the flex hose while you're at it. When I replaced my master and slave cylinders, within a week or two my flex hose blew off the fitting because the pressure was back to normal and the hose was old.

Shark Lover

Thanks I forgot your talking about the blue supply line right, it was on my list I forgot to add.

Shark Lover

Thanks everyone so the good new is I don't need the ATE (was not looking forward to the price) but now does anyone know how WILWOOD Hi-Temp° 570 RACING BRAKE FLUID would work (cause I have a good amount left from my 67 firebird where I added 4 wheel wilwood brake) with the clutch system? Thanks again.

deliriousga

Nope. The flex hose is black, underneath the car. There's no pressure in the blue hose. If you're not removing the clutch master and the blue hose isn't leaking, I would't bother replacing that. Major PITA to replace because of where it plugs into the clutch master.

The "Blue" I mentioned was the ATE Super-Blue brake fluid. I forgot about the blue hose so sorry if it sounded a little mixed up.

Shark Lover

Thanks I will look into the flex line.

Shark Lover

For the flex line it looks like I will have to see which power booster I have (my car is a 1979) not sure if it is the 9-10.

deliriousga

Before you order a new one, go under and see if the connectors on the flex hose are fused to the hard lines. If so, you may want to just see how it goes. It takes awhile to get the hard lines in since they're usually special order.

I hope you're back on the road rockin' again soon!

FlyingDog

Delirious GA, the blue and gold are identical except for the color. Also, the temp shouldn't have anything to do with performance unless you boil it of have air or water in the sytem. If cold temps effect your clutch performance, it's not the fluid.

Shark lover, if you don't need high performance fluid, don't use it. The Wilwood stuff is probably not good for the street if it is meant for high temps. Most very high temp fluids absorb water easily. ATE blue or gold or Valvoline synthetic are about as high as you can go without risking problems. The Valvoline synthetic brake fluid (I think it's a 4 but may be 3) is quite inexpensive and avaiable at places like Walmart or any auto parts store.

GlenL

I just don't think this is true. Some places sell the gold for less than the blue and the cans are different shapes with different descriptions on them. I've used both with no noticable performance difference. (In a gold stage now) Then again, off-the-self DOT4 worked fine and didn't boil either.

I replace the SS lines anually and bleed twice every DE weekend so the fluid is always fresh. I think the best part of using ATE is I don't have to take the time to explain to my PCA cohorts why I'm not using the pricey stuff.

FlyingDog

An ATE rep at VIR a few years ago said they were the same except one has gone through all the DOT certification testing and the other hadn't. The DOT tested one is repackaged for the US, and the other is the world package. He could've been full of it, but I don't think so.

GlenL

I'll take a closer look at the cans. They've got like twelve languages on them and it doesn't seem to say anything.

Does sound good to me. Looks like more ATE Gold will be in the pipes.