Master Cylinder

[Guest greavesy7]

Is it common for the brake pipes to leak from the master cylinder and how can you stop it

[Guest The Modfather]

No! If they are leaking then you are losing brake pressure. Where abouts are they leaking, as they enter the reservoir at the nuts?

If you have any slack you could cut the old end off, re flare it and tighten up, otherwise it will be a new pipe. Some times the reservoirs can get really manky especially if the fluid isn't regularly changed, and sometimes the seals will be shot as well. Best replace the whole thing as they are fairly cheap. Or clean it all up including all threads, refit new seals and check the ends of the connecting pipes.

You may just have a split or damaged end, check them first. Cheaper even still if it's just a new pipe needed!

 

HTH

 

Daz

[Longboarder]

Copper can work harden in use. It becomes less malleable and may not seal well if undone and then refitted. Inspect the pipe end with good light to see if there is any distortion or damage. If OK then heating with a blow torch till dull red heat and allowing to cool in air will anneal the copper making it soft again. Once cool, refitting and normal tightening may well re-establish a good seal.

 

Nigel

[johnlrichardson]

check the nuts are not bottoming before it tightens the flare

 

To anneal copper, get it cherry red and quench in cold water

 

HTH jon

[Longboarder]

Another poster (and a pm) has corrected me in that quenching anneals copper and air cooling doesn't. So quench away.

I stand corrected. My apologies.

 

Nigel

[Guest Ian & Carole]

Don't put your self down Nigel, you are both correct according to http://www.ehow.com/how_5796817_anneal-copper-tubing.html

 

 

1.Aim the torch at the place on the tubing you want to bend. Run the flame over the copper, moving steadily over it, heating the copper until it glows a dull cherry red.

 

2.3

Turn the torch off by closing the oxygen valve, followed by the acetylene valve.

 

3.4

Set the copper tubing aside for it to cool by air, or quench the tubing in water. Cool the copper fast so that it becomes soft. Water cool the tubing for a more workable material.

 

4.5

Work the cooled tubing, bending to shape as needed.

 

 

 

Read more: How to Anneal Copper Tubing | eHow.com http://www.ehow.com/how_5796817_anneal-copper-tubing.html#ixzz1BwqduvvS

[fry61]

Had posted the same thoughts to Nigel; my take has always been fast cooling;dunk it in cold water; is air cooling fast enough?

[Guest mower man]

Not wishing to be clever but have you got the correct flare on these pipes (I've done this myself) i.e domed or concave are not interchangable! once again apologies if I'm being a pendant mower man

[johnlrichardson]

I may be wrong but shouldn't the acetylene be turned off first

 

jon

[Guest Chutney]

I think the main point is to turn the torch off!!

[steve in stockport]

Have you checked to make sure that you haven't managed to mix up imperial and metric threads between the lines and the master cylinder?