I will be working on 93 ES300 Rear brake and guy at parts store told me I need Disk Brake Piston tool or Piston rotation Tool, it is a cubic thing with 3/8 square holes on every face, it almost looks like a puzzle piece. I guess I need to push a piston back into position as you spin with this tool.
Do I really need this tool? or Is this apply to newer Lexus.
Thanks.

 

That's the wrong one, the cube one that you are describing are made for calipers with a twist-in piston (Honda rear brakes)
The one that you need is in here (13th pic)...
https://www.clublexus.com/forums/sho...d.php?t=259349

 

Thanks Vin 78,
That's what I thought from reading your post. I'm grad that I didn't spend $15 for this tool. Since I don't own a C-clamp, I'll go ahead and spend $5 for caliper spreader tool.