Sorry, I mis-understood your question. I believe that the main reason Volvo went to the dual circuit brake systems was for safety reasons. I don't think they improved stopping distances much if at all. One thing that did improve the 122's ease of braking was the addition of a brake booster. I think that by the time the dual circuit brakes came out in late '67 all 122's had boosters.

My '66 122s has a single brake circuit and no booster. Currently the brakes could only be described as poor - very poor. I plan to overhaul the brake system before the car goes on the road. I'm hoping I can make them acceptable without major modifications.

One thing I'm curious about is do the late 122's with the dual masters have a triangulated braking system similar to the newly introduced 140 or was it just a dual line "X" type setup? Its been too long since I owned my '68 122s estate and I can't remember.

Ron Tewksbury

1978 244DL 241K miles

1966 122s ?90K miles