Sealey VS820 brake bleeder in use

Using it on a mini. I use max 10psi it is enough and will not risk damaging master cylinder. I released pressure in vessel between doing each calliper and just pumped it up again when I was ready. This tool worked very well.
Note, when you separate the union from the pipe to the master cylinder cap after bleeding your brakes, a fair amount of fluid will spill out of this connector so put a large rag underneath it to stop it going on your car. This is unavoidable because you need to separate the two in order to be able to rotate the master cylinder cap. Otherwise the tubing catches your bodywork etc and you can't turn it.

[@Benzknees]

If you've got a long run from the master cylinder to the back brakes, how do you know if you've got all the old fluid out. Is the colour change immediately apparent?
Also, when you've finished, how do you clean out the pressure brake bleeder, to make sure there's no remaining film left on the inside, waiting to contaminate the new fluid next time you use it?

[@Realminishorts]

yeah you just have to guess. look for colour change but also at least 3-500ml of liquid. that is likely enough. I leave the new fluid in the machine, as it is clean and sealed. If necessary just pour it away, no need to go mad and clean vessel out completely