m455sx

I have attached 2 photos, 1 is off my 442 the master cylinder that does not have the bleeders or the bosses for the bleeders and the other one is off of my SX that has the bosses for bleeder but they were never installed. Inline tube has the one with bleeders and they say that is the correct one. Is the one Inline tube has correct?

507OLDS

I have each of those master cylinders. The one without the bleeders or bosses came off my 70 that was built in Linden,NJ,October/1969.
The one with the bosses,but no bleeders I'll have to think about.
Do both of yours have the casting numbers on the underside?
I have used a few of the ones from Inline Tube,and I would again if needed. They do not have a casting number or julian date,but the appearance is correct.

ROCKET VAPOR

What code is stamped on the machined pad area of the master cylinder in the second photo? This two letter code will identify the master cylinder's original application.

Allan R

Is this what you're looking for? Just Power Brakes.com They claim it is correct for 1970 and up.

m455sx

for some reason i neglected this thread, will check next day or 2 for a code underneath. Not sure what im looking for as i do not know whats correct????

Allan R

The one I posted from Just Power Brakes is a dead on match for the OEM that came out of my car. Even has the bleeders.

ROCKET VAPOR

This is the location of the stamped I.D. code in the half moon shape machined pad.

The three digit julian date code is casted into the bottom of the master cylinder.

5470409EBCODE1970.jpg

Mr Shifty Sidney

For the 70 442/Cutlass, did they use the same master cylinder for power/non power disc applications?