After changing the brake fluid in my GAC GS5, the brakes failed. I thought it might be an issue with the master cylinder, so I replaced it, but the problem still wasn't solved. Can any experts offer some help?

Hey car enthusiasts, I'm having some brake issues with my 2010 Volvo S80L. The brakes work fine when moving forward, but there's a chance of brake failure during short-distance reversing. A few days ago, when I changed the brake fluid, it was noticeably slow to drain out before adding the new fluid. Could it be that the brake fluid line is clogged? The brake pads are still quite thick, so I can basically rule them out. Any advice from the experts? 😬😬😬

After changing the brake fluid in my GAC GS5, the brakes failed. I thought it might be an issue with the master cylinder, so I replaced it, but the problem still wasn't solved. Can any experts offer some help?

When driving at high speeds, there's a ticking noise from the driver's side window that sounds like raindrops hitting the glass. At first, I thought it was raining, but it wasn't. The right window is fine. The noise disappears when I lower the window. Could it be caused by the window seal? Has anyone else experienced this? How did you solve it?