Brake vibration/ warped discs

[Dave Walker 1966]

Hi, has anyone come across an issue with front brake discs either warping or wearing unevenly. I'm having to change my discs every 12 months/20,000 miles because my front near side disc is juddering. I'm on my 4th set!  and juddering  again. I was thinking caliper sticking but I can't see anything obviously wrong. Could it be ABS related?

[Magnet]

Welcome David,

A couple or so questions:- 

Are you a ‘slow down in anticipation driver’, or have a tendency to be ‘last seconds on the brakes’? 
Are you renewing these discs yourself, or having them fitted for you? 
What brand/s have been fitted?

Have you read Steve Q’s excellent post about the mating surface of discs and hubs? 
Kind regards,

Gareth. 

[Dave Walker 1966]

Most of the miles are motorway. Very rarely brake hard! Thought it might have been an issue with getting the cheaper end disc so got Brembo for the last set, maybe lasted a little longer but the issues back. Changed the discs myself, as I have dozens of times on lots of cars for myself and friends. Always make sure the mating surfaces are perfectly clean and flat. Never had this issue before and it's always the same wheel. I'm at a loss!

[Magnet]

I would suspect the caliper. 

[Dave Walker 1966]

Ok, in what way, sticking? Or is there another way they could contribute? It always looked to be OK but I'm going to take it off and strip it this time. I was interested to see if anyone else had come across the same issue.

[Magnet]

Sticking.