My 03 S60 has been sitting for one year. I didn't start it in the period so the battery is obviously dead. Today, I tried to jump start it with an external USB jump starter. But I got nothing after turning the key, no dashboard, no sound, no crank... Now I am thinking about remove and recharge the b...

By "measure the impedance between the switch contacts", do you mean the impedance between the metallic contacts that connect to the orange connector?

Thanks.

Very explanatory and practical. Going to do this recently. Thank you.

Welcome. I'm working on replacing the booster seal 'in situ' this summer, so if you find this issue, I'll put a video with a DIY this summer It will be great if you can demonstrate how to replace the seal without removing the booster and brake fluid container. I also followed your diagnosis video. ...

First make sure you have a pump down there, it's down under the air filter box, and you should see the switch attached to the front of the box as well. Start by looking at the switch, the plastic cover does break and fall. If replacing it, test the pump as explained here below. If you have a pump, ...

I've been doing some research on the brake booster and vacuum pump. I hope I can figure out what's wrong with my 2003 S60 AWD (YV1RH59H). My question is: when I turn my key to position II without starting the engine, is the vacuum pump supposed to provide me with some vacuum? In my case, I can hardl...