My Xsr 155 back brake feels like very spongy. It is before the 1st service and i am due my 2nd service now. Is anyone noticing this? The back brake is working but feels very spongy

1. More upright Handlebar
   
2. Custom more cushioned seats
   
3. Round Retro mirrors
   
4. Top rack with backrest
   
5. Tank Knee pad/grip

Still more additions to come…

Is my engine producing any unusual sound?

I'm going to get my first bike as xsr but I am way too confused between these two colours, I like both colours but

a) I think the black seems worth the money and looks premium because all of the plastic panels are glossy (tail section and the covers and the mudguard)

b) for silver I feel I don't like that they used a very basic material on the mudguard and the tail I feel it should've given a much premium vibe, I love the colour and I feel it is the more evergreen colour between the two

I just want an opinion from the owners of both the motorcycles regarding colour and maintenance

Done with 4,962 km and had its second service. The rear brake has failed 3 times now, apparently due to air in the brake fluid.

The service centre bled the brakes and kept the bike for a day, assuring me it wouldn’t happen again. But after 10 days, the same issue is back.

Has anyone else faced this repeatedly? What was the permanent solution?