Reply to "Brake master cylinder"

OK, I know this is an old post...buttttt, we need some clarity....

I just picked up a car with what would appear to be this same MC. Timeframe of install would be " a long time ago in a galaxie far....."! Pedal is getting mushy and front brakes may be sticking.

Dave is right, the E2TA number probably now crosses to a E3TZ-2140-B number which IS the 93-85 Ranger/Bronco II Unit.

What is good about this one? As of today, it is STILL offered by Raybestos (RockAuto.com) in ALuminum with LH side ports as shown in the original pic. Yes, you probably need to put adapters in the line, but they are for standard flares, not metric, so easy cheesy. Even metric to SAE adapters are now available....so not that big of a deal either!

15/16" bore. About $41 Raybestos MC39388

I have some stampings in the side of my unit "GC62B" with perhaps one more character....need to recheck it with a brass brush and a good lamp! But that is a long way from a E3TZ (1983 Truck line part was the original intention.) part number, unless it is on the bottom.

THE SVO MASTER CYLINDER(!): Is not a LH outlet unit. It is a 1 1/8" bore unit, in aluminum, with RH side ports. USED 1984-1986!

SVO IN 1987-1989, went to separate plastic reservoir design, and I think for a pretty good slant....angle....and still has RH ports.

So if you have an aluminum M/C that still uses the booster spacer, with RH ports you probably have the 1 1/8" unit.

There is likely a "generic" two sided ports version of this unit also, but will take the guys at the auto parts store some time to fish it out of their system!

I also found a 1990 Ranger unit, with the detachable plastic reservoir that is pretty flat, 15/16" bore, LH ports, aluminum, and std port threads in a Raybestos MC39567.

It changes in late 90 to a 1" bore but then also changes to metric bubble fittings, so you would need adapters accordingly. The angle on the reservoir also is a bit off flat... Raybestos #MC39953

WHAT I DO NOT KNOW ABOUT ANY OF THESE UNITs except for perhaps the SVO unit....is about the residual pressure provisions in the smaller reservoir fitting. Typically the larger reservoir is for the front discs..... SVO's were 4wdiscs. Rangers were front disc typically so I would suspect something behind that seat for the small reservoir. Will take my old one apart and see whus up!

Just for sh*ts and giggles, I also found a 1980 Chev Caprice unit with LH fittings that IS a 1 1/8" unit. But it is cast iron! MC36306 Raybestos. Too bad.....I'd be on it if it was AL!

I guess when you find something that works, take the time to either 1) write the part number on the M/C unit in sharpie marker...or 2) stamp the part number into the unit where it can be read whilst installed! and/or 3) keep the receipt or record of the part number in your log book! You are keeping a log book right? Every good pilot does....

More as I find it....
Steve