Rear Brake Bleeding On Thunderbird

You can buy a bleeding tool for next to nothing. Worth every penny.

https://www.aliexpress.com/item/32995225817.html

 

This is how I have done it. Suck in new Dot 4 using the pump on the caliper bleed nipple. Works pretty well. If you want to pump the brake leaver without pushing the pistons out a bit of wood works well. Another method I am planning to try is get a big ish syringe and push Dot 4 from the bottom up to the resovoir.

 

Just don't empty the brake reservoir. Empty just over half and add new do this a few times and hey presto job done. No need to do anything. But remember to hold the lever in and lock the brake between each refill.
Joe.