I have a trx420 qud bike when I go for a long ride it starts to brake down like limp home mod let it cool down 20min it is ok allan

The thermostat must be stuck closed. Best to have it replaced.

"pedal all the way down, no movement of caliper"
Sounds like hydraulic problem.

Check if you have enough brake fluid.

If so, it could be a bad master cylinder.
Rear brake light switch won't work without hydraulic pressure (which also works the caliper), while front brake light switch is mechanical.

when i shut off my 2002 suzuki motorcyle it run perfect then went to start i and have no power battery good have no light on dash no head light brrake light everything is dead what could be wrong can you help with a idea thank you dave

OK.... The problem is your brake lever. There is nothing wrong with your braking system, Master Cylinder is fine, pads are fine, fluid is fine, everything is fine. Replace that brake lever with the original one your took off, if not, it will cost you your life. I know I was almost killed due to the wrong brake lever. Everything on the new lever looks right. Right? Same, pin hole size, the plunger seems to fit perfect, the brake light switch flange, it fits, appears to work fine, doesn't bind.. Then wham!! You lock up. DO NOT RIDE WITH THAT NEW LEVER ON.. No matter how expensive it was. Live with the Stock one until you can be sure that the next one you buy is absolutely and irrevically safe to ride with. This MOD is not worth your life. FYI, my lock up occurred in the dark, US 101, lane three, 80mph. 80mph to 0mph in 1 second flat. Bike did not flip just came to a massive stop. I will spare you the "Most frightening 2 minutes of my life". I have 26 years of riding experience, and one stupid mod nearly took my life, and my bike, and more importantly, could have taken someone else's life, or scarred them for life had they hit me... Just saying'.
Happy safe riding. Phil.

Check your coil and the cdi, sounds like they may be overheating and shutting down. Also check for possible vapor lock.

Yes you were in throttle by wire limp home mode. What DTCs are set?

Mine used to do and after the shop had it a different days without finding a solution. I asked someone who used to own his own shop, who said to add a new ground, I did and I have not had the issue since. My fuel pump would lose power after the bike got warm. Maybe this wil help. jaxeagle

This depends mostly on your weight. Yes, it's safer to walk, but if you are a small person, and you can ride the bike on a level surface (like a parking lot) without the wobble increasing, then try pedaling hard in the parking lot. If that works ok, then you can probably get by. Don't ride fast. Don't ride down a steep hill. If you have hand brakes, and your front brakes are good, then don't use the rear brakes. But don't go over the handle-bars by using the front brakes hard! If you are not a small person, then walk the bike. Good luck.

http://www.carlsalter.com/motorcycle-manuals.asp

free pdf service manual here.

but it sounds like fuel starvation. change fuel filter and run some fuel system cleaner in the gas tank. get additive not spray

Sure mate. There is a cool mod you can do, where you are left with a fuseholder under the seat that bypasses all the safeties, wiring, kill switch, ignition switch and so on. You keep a blown fuse in it to make it all look good,and if  you ever loose your keys, or you get a roadside failure in the ignition electrical system(common problem),pop a good into your "special" fuse holder,  get the bike started with the kicker, and "limp home" so to speak.  I will track down some info on the mod for you. It is also good for eliminating the electrics notorious for failure on these old girls. I will find a link for you to the mod. Just have to find it now. Did this to my own XS650... just in case but have never had to use it. Back shortly:)
regards robotek