Monster S4R Back Brake

Hi,

After 18,000 miles, the MoT tester suggested that I nay want to change the back brake pads! I hardly used the back brakes except for holding the bike at standstill.

I did it by taking the whole caliper off and putting in mew pads. Put the caliper back on and now I cannot bleed the brakes to save my life. I even bought a vacuum bleeder but that has made no difference.

I suspect that it may be that the master cylinder is not working properly although it was fine before.

I've had the bike from new and the brake has never been touched before.

Anyone else had any back brake issues like this? I thought that I knew what I was doing as I did the front brakes last year in the same way. No problems there.