You can really simplify things and forget about the relay, it is not required.
1; There is no power running through the system unless the brakes are applied hard and the ABS pump kicks in so there is no hot switching.
2; Even with the pump running there is less than 15amps being carried through the system.
Just stick in a 15a switch and keep things clean and simple.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.