Master cylinder code list
 

I thought a list of the different master cylinder codes could be helpful. The codes appear in the 68 and newer Buick, Pontiac, and Chevrolet chassis service manuals. Anyone able to add the Oldsmobile codes (section 5 of the manual) or the 1970 Chevy?
I kept the list short and simple, so there may be more info in the service manual.

Chevrolet 1968
AT - drum full-size
BS - Drum, manual and power Camaro, Nova, Chevelle
AU - metallic manual Camaro, Nova, Chevelle
DC & PG - Corvette
SA - power disc Chevelle & full-size
AD - disc manual Camaro & disc manual & power Nova
WT - power disc Camaro

Chevrolet 1969
AT - drum full-size
BS - Drum, manual and power Camaro, Nova, Chevelle
DC & PG - Corvette
TA - power disc full-size
BA - power disc Chevelle
US - power disc Camaro Nova

Chevrolet 1970
EB - power disc Camaro
BB - power disc Chevelle
UT - power disc, Nova

Pontiac 1968
HU 1" bore - drum power and manual, full-size
CT 1" - drum power and manual, Firebird & Lemans
FR 1 1/8" - disc power and manual, Firebird
GD 1 1/8" - manual disc, Tempest A-body
DW 1 1/8" - power disc, Tempest A-body

Pontiac 1969
HU 1" - drum power and manual, full-size
CT 1" - drum power and manual, Firebird, Tempest, & Grand Prix,
GA 1 1/8" - power disc, Firebird
EA 1 1/8" - power disc, Tempest & Grand Prix
RA 1 1/8" - power disc, Pontiac (full-size)

Pontiac 1970
EB - power disc Tempest & Grand Prix & Firebird
RA - power disc Pontiac (full-size)

Pontiac 1971
EB - power disc Firebird

Buick 1968 & 1969
CT - drum power and manual
DW - power disc, Skylark A-body
LX - manual drum, LeSabre
HU - power drum, LeSabre Wildcat Riviera
YM - power disc, LeSabre Wildcat Riviera

Buick 1970
CT - drum power and manual
EA - power disc Skylark A-body
LX - manual drum LeSabre
HU - power drum LeSabre Wildcat Riviera
RA - power disc LeSabre Wildcat Riviera

Oldmobile
HU - 67-69 power drum

More info on Camaro brakes: http://www.camaros.org/suspen.shtml#Brakecomp

5460346 and 5469309 were the oval disc brake master cylinders. The 346 was used 67-68, 309 was 69 and later.
5470409 was the rectangular master that came out in 1970.

Kurt - "EB" is the code for 1970 Camaro with power brakes...assume it's the same for Firebird as well.

Added.
Can you see if there is a table of 1970 master cylinders in the 1970 Chevy chassis service manual? In the 69 book, it's on page 5-16.
It's not in the 1971 manual, btw.

The 70 Pontiac table had many empty rows - it was not complete. Confirmed via another source that 70-71 Firebird was EB.
Thanks!

I have 1972 Chevy Nova SS Master Cylinder with a OX stamping. Anyone know much about this stamping?

I have a rebuilt 409 BE

No,there's nothing in the 1970 Service Manual,nor the 1970 Overhaul Manual either.
There's just a footnote that says,"See Kurt S." :)

I believe BE is 1972 Chevelle w PDB

Could also have other applications.

Thanks for checking the manual Rick!
The master cyl info is not in the 67 and 71 GM manuals, but it is in the 68-70 Chevrolet, Pontiac, and Buick manuals (except missing in the 70 Chevy manuals).
Someone will have the Olds manuals to check. ;)
I haven't seen the info in a Delco Moraine catalog - did they print a master cylinder catalog? This is one for the boosters. The parts manuals are poor sources for this type of information.

BE has also been listed as 70+ full-size and I think it had many applications in the early 70's.

UT code for a 70 Nova if anyone wants to know.

Rebuilt BE "409"