His legs don't work.
Linking brakes is easy. You just need a line to go from the from the front master to the rear master with two double banjo bolts. Measure the run, and look at the banjo bend. Then all you have to do is order the braided line (all around so they are even, and add in a double banjo bolt to the two masters.
A thumb brake will do the same thing, but only activate the rear. It will not lock the rear unless you are in the dirt.
How about you learn how to ride the bike well first (which should take a few years), then see if the only thing you want to do with your bike is wheelie it? Learning to ride competently in all situations (rain, sleet, winds, night, long-distance, etc.) might lead to many more things.
If I use a rear thumb or hand brake, do I run the brake line directly to the rear master or do I tie into the existing brake line. The bike is a fj09 and has abs.
How about you learn how to ride the bike well first (which should take a few years), then see if the only thing you want to do with your bike is wheelie it? Learning to ride competently in all situations (rain, sleet, winds, night, long-distance, etc.) might lead to many more things.
This is the important part.
While it is not impossible to add a second master-cylinder to the current system, if you want the ABS to function properly, you should not do this. Remove or disconnect the original master-cylinder and replace it with a hand / thumb operated one, and run the line from that to the ABS pump.
If that is not an option, or you want to retain the function of the OEM master-cylinder, you will need to add a completely separate system to the motorcycle: master-cylinder, line, AND caliper.
Guess I could have taken a look at his user name...
If I use a rear thumb or hand brake, do I run the brake line directly to the rear master or do I tie into the existing brake line. The bike is a fj09 and has abs.
Mr Cincinnati's, I am a two time national speedway qualifier in the early nineties (thats the top 18 American riders and two from over seas) in 95 I won the hollister national in the over 30 expert class and was district 36 #1plate. got divorced MISSED a few years then got into desert racing. I have 9 over all wins, two best in the desert #1 plates and to many over /30/40 expert class wins to remember. I think I am ready to ride a wheelie. It's not the only reason I need a rear brake.
Sorry for my comprehension gap, my apologies.
Do what you want to your bike, I'll stand back &