Front brake lockup

No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationWas taking the bike for a spin this morning and I kept having trouble pulling away from stop signs. Then I went around a slow corner and the tire seemed to lock when I hit some sand. Got it home and could barely push it around, turned out that both front rotors were pretty hot and the brakes are locked up.

My inclination is new MC and lines since they are original. The brake lever makes some weird squeaking sounds when I press it, so I'm thinking that the O-rings are doing something odd in the MC.

Any reason to not just start replacing parts? Looks like a new MC/lever is $35 and some stainless lines are $100

Looking at these, unless someone has a better suggestion. (81 KZ750 LTD)

I have bouth the same front master cylinder for 2-3 years ago, no problem so fare.

Since both front rotors are hot I suspect you are right, the MC is the likely culprit. Have you rebuilt the calipers?

No, the only brake work I did when i got it was new pads since everything seemed to be working.

You are on the right track. That master will work and replacing the lines is critical since the old ones are sure to be full of crud and the rubber deteriorated. I'd add a teardown of the calipers to the list of things to do since they are likely full of crud too. Changing the seals is a good idea and if the piston is pitted that should be changed too. OEM seals are the way to go. K&L brand brake system parts suck. I've had nothing but bad experiences with them.

No eBay APP ID and/or Cert ID defined in Kunena configurationOk, ordered up some caliper kits too. Hopefully the pistons are ok. I will likely strip everything tonight. Won't have parts until Friday.

As predicated, all full of gunk and pitted pistons

That looks like a aftermarket MC anyway.
Steve