HELP WANTED--1970 Giulia Super Clutch Master Cylinder - Page 2

JOEBMW · #16 (**permalink**) 10-17-2007, 12:51 PM

Quote:

Originally Posted by twoliterlover

Clear now that the knock off master cylinder is NOT Girling. And upon closer inspection your system looks more like clutch cylinder of Girling system instead of brake master.

Regardless, it may well be that the bore size changed on these "B whatever" brakes, but still be careful on the brake fuild. Dot 4 is an American Specification, not one geared to natural rubber that was used in Italy a lot longer than we did here. I'd still get in touch with some outfit that has Castrol LMA brake fluid (unless you end up having to do entire system, in which case you might contemplate starting completely over with some silicon system). I recently found a 1964 2600 sprint that had been sitting for many many years. The only thing that still was really up to par was the hydralic system. Discovered the previous owner had problem early with brakes and clutch and was forced to replace all seals with rebuild kits. So he decided problem might be that he was too close to ocean and storing his car in wharehouse on the dock. He thought he would try to use the same same silicon based brake fluid he used in the hyster fork lifts at his shipping company. Certainly worked. Everything else was questionable but all those worked well. I could not understand why the fluid was different color. He showed me the hyster forklift brake fluid can. It was that color and silicon based. He certainly proved a point. But you can't mix and match. I've never had the guts to try it.

Jay

JOEBMW · #17 (**permalink**) 10-17-2007, 12:54 PM

Quote:

Originally Posted by Bill S

Joe,

That's great! You're gonna love this car. Be sure to post some pictures.

JOEBMW · #18 (**permalink**) 10-17-2007, 01:02 PM

twoliterlover,

I just looked up the Castrol GT LMA fluid. i have never used this type of fluid. But i have used ATE Super Blue Racing Brake Fluid. Can i use the ATE stuff for the alfa? They both say that they exceed the DOT3/4 specs.

Seinista · #19 (**permalink**) 10-17-2007, 01:32 PM

C'mon guys.
I've been into older 105 like most of my life, and have ALWAYS used DOT4, never ANY problems. Also I have ALWAYS bought new cilinders, clutch as well as brake. Because a rebuild kit works for maybe a couple 1000 miles before it busts again. Why? because to use a rebuild kit would mean you have to regroove it first. Where the sleeve will have traveled will be wider and the 'edge' of that smaller and it will 'eat' your new cups.
Also it is far simpler to buy a new one and be done with the problem...
I've seen the centeline catalogue in the States, and over here in europe OKP parts, etc everyone sells 'em...

**papajam** · #20 (**permalink**) 10-17-2007, 04:40 PM

Quote:

Originally Posted by JOEBMW

Yep, its the clutch master cylinder that is the problem. i thought you knew that?
How does this Silicon Fluid compare to DOT3/4 in the temp. rating?

JOEBMW · #21 (**permalink**) 10-18-2007, 05:59 AM

Quote:

Originally Posted by papajam

I would NOT recommend silicone brake fluid (DOT5) in this clutch system. Seems the viscosity of the fluid is such that the master cylinder inlet seal may not seal 100% of the time (meaning that when it doesn't seal, you have no clutch hydraulics). I switched back to Castrol LMA (which exceeds DOT3 & 4 specs, BTW) and have never had a problem. Actually, been using LMA for decades.