Hello. I've been struggling with the cruise control on my wife's '93 940 wagon (automatic transmission). When we first got the car a little over a year ago (we replaced our first 940 wagon after being rear-ended and totaled at 250,000+ miles). At first the system would engage, but lose speed gradually and I got it down to an tired brake pedal switch/valve. I took apart the switch and attempted a fix by adding a bit of dielectric grease around the o-ring. That helped for a while and the cruise control worked perfectly for about a month. Then started doing its thing of loosing speed again and then stopped engaging all together. I finally got around to doing a more permanent repair on the vacuum valve at the brake pedal. I took it apart again, cleaned out the dielectric grease from before, made sure everything is clean and dry, then applied two layers of plumbers' Teflon tape to the plunger and reassembled. I checked it with my mity vac and the switch holds 15 psi indefinitely now. I re-installed it, checked the vacuum lines by unplugging the T at the vacuum pump and connecting the mity vac to it instead. I applied some vacuum and observed the servo pull the throttle all the way in and hold it for a long time without loosing any vacuum (according to the gauge on the mity vac). So, my plumbing is good. Went for a ride, no engagement at all from the cruise control. My brake lights are working fine, my speedometer works fine. I performed diagnostics on B2 after driving over 22 mph and got no codes (1-1-1) on mode 1 and all the proper codes on mode 2 except for the 1-1-3. I have no idea how to activate that one. I think that possibly it's for manual transmission. I have not tested the pump itself, I guess. How do I do that? Everything else seems fine. The pump did work a while back when I got engagement, but lost speed due to the leaky brake pedal valve.

Any help would be appreciated!

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Vladimir. '98 S70 base, 5-speed manual - his, '93 945 - hers