After my 20mile ride into work a green liquid came out of the rubber pipe under the engine. Not sure if its break fluid. Its a 1250 Bandit 07 reg. ABS

If the fan turns on then the temperature sensor is working. Just make sure the fins in the radiator are clear. It is normal for a fan to be on. A big engine like that creates a lot of heat. you might find a way to check or service the water pump. Check the impeller.

https://www.google.com/search?q=suzuki+bandit+1250+fan+runs

Pump schematic

https://www.suzukipartshouse.com/oemparts/a/suz/50d40931f8700230d8b4fc87/water-pump

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When the display indicates 'CHEC', check following items:
* Make sure that the engine stop switch is in the (on) position.
* Make sure that the transmission is in neutral or the side stand is fully up.

If the display still indicates "CHEC" after checking the above items, inspect the ignition fuse and the connection of the lead wire couplers

could be the master cylinder is bad. or you have air in the system. you can try bleeding the brakes to see if you have any pressure

check they are similar if so the only difference could be the teeth of the drive therse no reason not to work if the teeth are the same in number

there is a common fault with the 1250 bandit in that the magnets detatch inside the starter motor and it eventually breaks up and stops working, this can begin with sluggish starter especially when hot, it would appear to be a flat battery but the power required by the failing starter can drop the battery off quickly to confuse you when trying to find your fault

Look for a vacuum leak either in intakes (where carbs attach to cylinder) or a hose somewhere.

Sounds like a mix issue and things are working and adjusted going into the cylinder.

Is your exhaust clogged? Is the condensation water draining correctly (your tail pipes are high so water collecting in the exhaust on cold engines will stay in the bottom. It could even build up if you only take short trips and your small drain holes are clogged. I've also heard of a kids sticking things into exhaust pipes before!

Finally, sometimes rust or other causes clogging. Unfortunately, I don't have an easy way for you to check it.

may not all have fitted, but that year not to have is rare, when you turn on ign a ABS light should come on unless someone has hiden it to cover a fault. if you look under bonnet, and find the servo/master clylinder unit (near the brake fluid reservoir) track pipes down a block with several brake pipes running to it then it has , if the brake pipes from the master clyinder run direct to the wheels then you have not,
or find a clear road drive down it then slam brakes on hard if pedal throbs thats abs working

Run the buke till it is warm i.e. till the thermostat opens. This will bleed system.Then let it cool down and top up rad