If you donut have a tool to change the rear brakes is there maybe a other what to release the cylinder on a Volvo s40?
you can use a c-clamp and a pair of needle nose. turn the c-clamp in and put the ends of needle nose in the grooves on the caliper and turn at the same time. Its a real pain but it will work. If you have a harbor freight tools by you, you can purchase the tool for about $20.00 dollars. Even if you use it once its worth it.
All Volvo 240 models have four cylinder engines. The four in 240 indicates it is a four cylinder, just like the Volvo 260 is a six cylinder. The last number in the model designation indicates the number of doors. A 242 is a two-door. A 244 is a four-door sedan, and a 245 is a station wagon (estate).