I have to replace the lright front brake hose the long one.... on my 2002 K1200LTE. Should i just drain the fluid from handlebar reservoir. Replace the line & then just bleed the front brakes when finished?
Welcome to the forum jwbmxk. You need to learn a little more about your bike before you start this process. If you don't have a Clymer manual for your bike, I would highly suggest you get one if you are going to be doing your own service. All your lines are very old so they should all be replaced now as a safety issue.
The 02 LT has integrated servo assist brakes ( I-ABS) and there are 4 separate brake/fluid circuits. It sounds like you still have the OEM rubber brake lines and they have started to leak. You should replace all the lines now as you will be chasing them as each one leaks or bursts from age, usually when you need them most. Spiegler makes a good stainless braided set that most people use rather than the more expensive OEM replacement lines. Galfer also makes a line kit.
The handle bar reservoir does not go to the front wheel on the servo assist bikes. It goes to the ABS unit as a control circuit which activates the pump and then the second brake circuit is pressurized applying the brakes. They are separate from each other. It is the same for the rear brakes, the pedal is the control and the ABS unit applies pressure on the wheel circuit to apply the brakes. Here are a couple videos on the line replacement process as well as the integrated ABS bleed procedure. Please watch them and then come back with questions and the members here will do all we can to help you be successful. If you can fill out a little more of your profile with where you live ( generally), there may be someone close enough to come and assist if you need it. I just did one of these for a friend 2 weeks ago. It will take the experienced several hours to complete.
Brake line replacement video. This is the non-servo version but it is very similar in nature. You would need the 02-09 I-ABS line kit so don't write down the part number in this video.