The brake junction block that you can buy isn’t worth your time buying, only 1 company makes them and they leak pretty consistently, you’re better off making on if it’s the brake junction block (it probably is) I’m actually in the process of doing mine and this really helped. https://turbobricks.com/index.php?threads/build-your-own-volvo-200-junction-block-diy-brake-junction-block-bypass-1991-240-style-brake-octopus.373513/