I picked up a "low mileage" (166K) 89 244 DL yesterday. Seller couldn't get it running and his descripton sounded like a fuel relay. Popped the new relay in and it started right up and is running great! It also needed an alternator and luckily I had a newly rebuilt spare that I found at the pick-n-pull recently and stashed away for a spare.

My new project has a brake failure light illuminated however, which I have never had to deal with on my 87 244 or my 87 745 before. What causes the light to illuminate? Is there a sensor somewhere for hydraulic pressure? I know there isn't a fluid level sensor or wear sensors on this car so it must be an electrical sensor but I can't find it. The brakes are also spongy so I attempted to bleed the front calipers and got a good stream of fluid from all three bleed ports on the left side. On the right side I got a good stream from the inboard bleeder but couldn't get any fluid from the outboard
bleeder at all though. I ran out of time so I haven't bled the rear yet. I know the system has two separate hydraulic circuits and that both circuits control braking on each front wheel, but are they completely separate within the front calipers as well? I'm trying to figure whether the fact that I get fluid on both sides of the left front caliper indicates that both hydraulic circuits are pressurizing or if one working circuit would result in fluid on both sides?

Second problem is a non-functioning temp gauge. Again, I haven't dealt with this problem with my other bricks before but I know I there are issues with the temp compensation board and that the solution is to bypass it with a jumper. Is a non-functioning gauge the usual failure mode for the temp comp board?

Thanks in advance for the help!

Jim