BigAl1

Does anybody recognize this part circled in the pic? This is on my 1980 Euro S, and it sits just ahead of the brake master cylinder - you can see the hardline from the MC goes into one end of this item. I suspect it was added during the "federalization" process because it doesn't look like a factory mounting job. Note the 2 brake pressure switches don't have wires connected that make a circuit to anywhere, yet my brake lights work fine!

Allan
1980 Euro S getting a thorough checkover and much needed TLC

GlenL

Weird.

Do you have any other add-on parts? Aftermarket cruise control?

BigAl1

It has the original? cruise control stalk marked in German, but I haven't tested to see if it works yet. I'm just digging into this car and finding a few "odd" things that look like were done for the importing process. I can't see this part shown in PET anywhere, so hoping someone else with a federalized Euro S will recognize it and it's function.

GlenL

I have an '80 Euro S and it was federalized but poorly. I can't imagine the function of that part you've pictured. Some sort of brake proportioning valve? Primitive anti-lock system?

An odd factor is that the brakes on our cars have an unusual diagonal split. Each half of the master cylinder feeds a diagonal front/rear pair (RF/LR and LF/RR). Then there are two brake limiter valves, one for each rear caliper. For this to be effective as some sort of braking enhancement there'd need to be two. So that makes me wonder if it's just trying to get a switch closure.

The brake light switches are on the bottom of the master, BTW. Maybe someone couldn't figure that out and added a jerry-rigged system in its place.

Speedtoys

I would think that that diagonal split, is to ensure that if one end of the MC failed, or the lines thereoff...that you have some brake on both ends of the car, neither front only, or rear only.

?

GlenL

Yeah. That's why they did that. Gave it up on the S4.

BigAl1

Thanks GlenL. I'll dig into this some more when I get to the brakes. Currently redoing the fuel system at the back.

dr bob

'Murican cars used to have something like that to 'detect' when there was a failure of one hydraulic circuit. The dual-switch arrangement on the MC does that on your early 928, so I'm puzzled as to why that would be added to your car, especially with no wiring attached. The real full proportioning valves have four connections on them, rather than just the two you have on that thing.

SharkSkin

Could that be an old-school line-lock, perhaps disconnected after the PO discovered the diagonal split braking system -- or worse yet,plumbed up to actually work?

dr bob

On second look it appears that this is in series with just one of the diagonal circuits. That rear switch is just screwed into a brass T fitting. Looks a little too hillbilly to me, especially in a brake system; It would be out of my car pretty quickly if I could do it without twisting any of the brake piping.

BigAl1

Thanks for all the comments. I'll be looking very closely at this in the next few weeks and determine if it can be removed without affecting anything. It doesn't appear to be doing anything now, but must verify that.

Allan