UK Car Repair: re-building an MG midget brake master cylinder, brake master cylinder, clutch fluid

Question
Hello, I read one of your other answers regarding a problem with a brake master cylinder.I have two of my own master cylinders that I need to re-build (one due to leaking, and one due to only the front circuit moving fluid).The car is a 1971 MG midget 1275 w/ manual disc/drum brakes.I intend to order the kits from "Moss",but I can not remove the plastic/nylon bushing.Are there any tricks to getting it out? I have read that one should just drill it out in pieces, is a new one included in the kit? Any other advice to get me through this? What are your thoughts on longevity of the rebuild if all is well inside the master?I have replaced everything on the system except the hard lines and have ordered new "brake/clutch fluid" marked DOT4. Thank-You very much for time !!

Answer
Can you give me a link to the exact kit you are using to rebuild?
Then I can know for sure if the bushes come with it.

With the bushes being nylon I'd use a screw - heated on the gas, then screwed into the nylon bush (use pliers/screwdriver in combination), screw it in while it's hot and it will melt into the plastic - when it cools then screw it as tightly in as possible then pull the bush out with pliers, you might burn your fingers but you wont go drilling holes in the wrong place. If it doesn't melt fer enough the first time just repeat heating/screwing the screw in a few times till it gets a good enough key to pull it out. otherwise you may have to drill it out. If you screw ijn two screws you can twist/pull the bush out then with a mole wrench/similar.

When I see the kit I'll have a good idea of it's longevity - generally the kits are either equal or better to original parts, so 60k miles almost guaranteed with proper servicing/maintenance, let me see the kit before I say for certain.

Sorry for late reply my internet is really slow right now.

- Looks like the kit does come with new bushes, but leave the old ones in for now just in case -
I also thought a slightly oversize threaded bolt could be screwed into the bush and then pull it out with a vice or something?

DOT4. fluid should be ok, if anything it gives better feel than dot 3 (the recommended fluid) - I've been using ONLY dot4 for about 10 years now, And it gives constant good results as far as I'm concerned, I upgraded the brake fluid from 3 to 4 on my motorcycle after an accident caused by front brake locking up, it has more feel in the lever now and you can feel when the grip is on the limit, so DOT4 gets my vote for sure.