Asking to much from my brake?

Have an Avid elixir 1 with a 180mm rotor on the rear of the dj, when I try to hold the bike on the rear wheel the brake lets go and starts to slip.
Been rebleed twice, cleaned with isop, new kevlar pads, asking to much from it?
Been rebleed twice, cleaned with isop, new kevlar pads, asking to much from it?
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Parktools :?:SheldonBrown
Dirt Jumper Dmr Sidekick2
maybe I'm just getting old, but I'm unfamiliar with this repair technique of "wazzing"
Iron Horse Ojiki
Carrera Kraken
The Carrera Hardtail owners thread
There is no secret ingredient - Kung Fu Panda
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Parktools
Parktools :?:SheldonBrown
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
If you have never "wazzed" anything in, you ain't lived.......
Anyway it worked, all good now, until it needs wazzing again.
Dirt Jumper Dmr Sidekick2
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8