I have replaced this on each of my 240's. Three times. It is worth the bucks to buy a new one. I think one of the parts houses sells a kit to repair the old one. IPD used to, I think. Use a quality fluid line wrench for the job. DO NOT USE AN ADJUSTABLE WRENCH. You will need to put a plastic baggie over the fluid reservoir opening and then screw the cap back on. This will help in keeping the fluid from pouring out so fast all over you. Use good rubber latex gloves. The job is pretty easy, but messy. Do not bend the lines. Bleed all the wheels after the job is done and follow the manual on the bleeding sequence.
When you loosen the lines on the junction make a good solid initial counterclockwise turn. Be sure to leave the junction box bolted to the car until you loosen all the lines. It is great to have a new box and you will know it soon. FCP Groton has the best price I have seen. www.fcpgroton.com/volvo.htm