Related to brakes, I have a part that broke from under the hood near the brake fluid reservoir on the drivers side next to the firewall. It is 'L' shaped and has something to do with the brake fluid I guess. After it broke, the brakes quit working. It plugs into the electrical system and then snaps over a round hole covered by a thin rubber disk. The disk has a stick in the middle that fits inside the 'L' shaped part that is broke. Any one know what this part is or more importantly the part number?

Cars & Trucks - Volvo - S40 - 2001 Volvo S40