Has anyone here had a sticking caliper piston? Can you repair it with the caliper overhaul kit? Or do you need to replace the calipers?

 

You may be able to repair it with a kit, but the piston (part that is stuck) probably will have corrosion around it's periphery, and will no doubt leave scoring marks in the cylinder of the caliper. That may or may not be repairable. For the cost of a rebuilt caliper, I would leave the rebuilding to the professionals, and just swap it out...

.02

 

Probably best is to have a look at it I guess. The repair kit is not expensive and the factory calipers are around $320 USD each.

Does anyone here know what the kit number for the front for an 2003 LS430? Is it 04479-50130? Is there one for the rear calipers as well?

 

Lexus kit PN's are as follows;
Front 0447950130
Rear 0447950140

 

Excellent. That's what I was looking for!

 

My pleasure!