Does anyone know what style power disc master cylinder was used in on early 70 models? Specific October 69. I am pretty sure most of the 70 model run used the rectangular single bale type but i have heard early cars may have gotten the early oval type with dual bale and EA stamp. Does anyone have a good shot of lines and valves on both types? Thanks in advance.

 

My October 1969 built W30 had a single bail master cylinder code “EB” with a casting number 5470409. I have yet see a 1970 model year Cutlass, 442, or “W” machine with a 1969 disc brake master cylinder (dual bail) as your describing.

 

I have seen several 4-4-2s from the '70 model year that used the earlier "bathtub" style dual-bale MC, but I don't know if that was correct for the application, nor do I know the build dates. However, the cars did look to be pretty high-end and authentic restorations.

 

That is good info guys, I think Joe/s car being the same as what I'm working on may be the best bet. Interesting that all of the 1970 442 road test cars when they give a shot of the engine compartment seem to show single bail type. Press cars are usually early cars as well..

 

 

Good info

 

The service manual shows code EB for 70