they must be different, otherwise volvo would use the same part and number for the abs cars as the non-abs.

1330799 is the old setup to 77 with lines out both sides.

1330800 is the 1 we all know from 78-90 with lines out 1 side.

8241131 is the abs cars only, nla from volvo and trw(probably the oe vendor).

good luck, chuck.

Yes, I've seen marks from time to time and puzzled over them briefly but never made the connection to claws. Very enlightening. Thank you.

"But the project at your link is the opposite. Interesting idea."

Just to clarify this trick; it wasn't someone doing this in his garage, this was a part bought at the auto parts store. A re-built caliper from a rebuilder claiming to be the best but still winding up with a lousy reputation among forum dwellers, as you see from the thread referenced. A rebuilder would have had to machine plugs capable of sealing the flared openings and drilled a passage to join the two circuits -- absolutely nothing I'd attempt from my complement of home tools.

As to your preference for non-ABS, I do indeed have the opposite view. Though it costs some more in maintenance, I believe ABS is a useful thing to have. Only one of our family has it in a 240, and that is in a '93. The '93 240 is a different animal in so many ways, some good and some not so.

--
Art Benstein near Baltimore

Engineering says: "Preliminary operational tests are inconclusive"
Engineers meant: The darn thing blew up when we threw the switch.

strandbergs has used abs calipers for 50. try that. good luck, chuck.