Hello from Australia.

This is my first post to this forum, though I have watched from afar for quite a while.

I have a 1976 W123 300D with formerly NA OM617 fitted with an aftermarket T4 turbo and 3" straight through exhaust. No intercooler, but do have a cooling mist water/methanol injection system. The old girl is pretty old and tired, so not pushing out too much power, but still moves along ok.

I have been thinking of installing a rear brake line lock solenoid to isolate the rear brakes for the purposes of doing a burnout (I know....why? long story) without doing damage to the rear brakes. I see there are plenty of options available from the likes of Hurst and B&M etc. All seem to use 1/8" NPT female threads on the solenoid. I'm trying to work out the best way to adapt that to my W123 brake lines, which I believe are M10 x 1 (correct me if I'm wrong) inverted flare. Any sort of pressure-rated steel adaptors seem to be few and far between.

Assuming I can get hold of some adaptors, rather than bending new steel line, do you think it would be possible to use standard flexible lines between the master cylinder and solenoid and then solenoid to existing hard line? Would the male M10 x 1.0 end of a flexible line screw into the master cylinder and seal properly?

Any advice appreciated!