brake master cylinder advice

[cococola]

I need to remove my brake master cylinder and the nuts are so seized on the pipeinside the chassis.
I was thinking of cutting the pipe going into the chassis so that I can remove the master cylinder in order to replace the seal kit on it.I can then make a join into the pipe for refitting.Has anybody else tried this please?

[simmitc]

Just renew the entire pipe, it runs the the union near the radiator where the brake light switch is. Put plenty of releasing fluid on all unions to be undone and leave to soak. Hold the 4-way junction firmly to prevent twisting when undoing the pipe fitting. It's just not worth putting in joins where they are not needed.

[Trickydicky]

Personally I would not bother with a seal kit, I would just buy a replacement M/C. The bore of your M/C may be pitted and the seal kit may work for a short while.
It's no fun having to remove the cylinder twice.

[bmcecosse]

As above - don't make -joins' - just make new pipes. You can often re-use the old unions...with new pipe.

[cococola]

Well Ive taken all of the fabulous advice for removeal (thank you all) and I have replaced the seals with new ones.
I just want to confirm that from the pedal end rod that you cant move this by hand before I refit the cylinder?

[rayofleamington]

I just want to confirm that from the pedal end rod that you cant move this by hand before I refit the cylinder?

Do you mean that you can't push the m/c piston into the m/c?
It should be possible by hand, but it's hard so normally I would use a big crosshead screwdriver into the hole where the rod fits. Then push on the end of the screwdriver handle to make sure that the m/c piston slides smoothly / freely and returns well. Doing that by hand is a worthy check, as you don't ant to find the m/c is sticking AFTER you've fitted it to the car.

[simmitc]

#agreed, it's a powerful spring. I test by putting a rod into the end (as per screwdriver above) and then press that against a bench whilst holding the cylinder. It will require effort, but should be smooth. Did you check the bore for corrosion prior to reassembly, and ensure that everything was thoroughly clean? Also, lubricate with a little fluid on assembly and prior to testing.