- Dec 14, 2002
- New Jersey
Bought my 300CD in CA, drove it cross country, drove it quite a bit around on road trips, etc., then got caught up in figuring out window regulators, parked it in my garage, kids came and... Now Im trying to get it back going. Had changed out the coolant to G-05... Diagnosed a leaky schrader, so changed it... Got tires mounted on my CalChrome Clear'ed 15" Bundts: And went for a drive... The AC charge is insufficient, and it was 86 out, so it was OK but not cool in the cabin. I can fix that. So the issue... Driving along, under harder braking, like a more rapid stop at a red light, it felt like if I applied the brakes it was OK, but let off there was a front end clunk. Like something is loose in the front end. Now remember that when I parked it, Id drive the car anywhere. Literally did. Ran great, nice AC, etc. I did stuff to it, but never encountered this. Almost feels like the suspension is shifting forward and backwards a tiny bit when doing this braking action... So I got home and checked the wheels - left front wasnt able to be touched. Immediately jacked the car up, could barely touch the lugs, got them off with my impact. Got out the IR camera. (ouch!) This is it in real life. Nothing could be touched 15 minutes after removing the wheel. For reference on the other side... Which still seems a bit hot to me... I know, not the exact same spot on the rotor, but it was much cooler overall. So... I guess it means seized caliper, and need to re-do the entire brake system. Not a big deal. But my questions are now: 1) When braking, it felt like something in the front suspension was shifting back and forth very, very slightly. Maybe it was a seizing of the pads to the rotor? nothing on the front is loose, I had rebuilt most of the front suspension, and the steering on this car is tighter and better than any W123 or 126 Ive ever driven, including my 240D with 73k miles. Is there something else I should check given that the typical play and shake tests yield nothing, and it only happens after a hard stop? 2) We drove all over doing errands. Probably 30 miles, six startup and shutdowns, etc. All was perfect. But the last leg, the last 2 miles just in town, slow to get home, the braking got softer in the pedal, and after I pulled up in my driveway and tried to shut the car off, it hesitated to shut down. Im not sure that the continuously softer pedal and the difficulty shutting down were coincidental. But Im not sure the seized/hot caliper is the same error as if there is a brake booster/vac issue. Any thoughts? Keep in mind that this diesel relies upon a vacuum pump and vacuum manifold to give brake boost and engine shutdown... Thank you for any recommendations!