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Brake tube flaring
iiyama - 17/5/08 at 03:54 PM

I have had to shorten a length of brake pipe so that it fits. This end fits into the Master cylinder and at the bottom of the aperture the base is concave. I have a brake falring tool but this flares the pipe to concave also. Will cause a problem with sealing?

Im guessing that I need a double flare to make the end of the pipe convex but I dont want to buy a tool for one usage, (the rest of the brake system is done).

So what to do?

Cheers

Pdlewis - 17/5/08 at 04:00 PM

I took mine to the local motor factors and they flared them all for free

iiyama - 17/5/08 at 04:12 PM

That will be difficult for me as the pipe is all fitted to the car and will be a major b*** ache to take out.

britishtrident - 17/5/08 at 04:28 PM

Are you sure its should be double flaired ? --

Normally ISO metric brake flares are officially only convex -- ie only one operation to give a bubble dome shape. However I would not expect to find one on a master cylinder outlet.

With old SAE and Imperial fittings double flares officially exist but are intended for special purposes.

Peteff - 17/5/08 at 04:34 PM

Which tool is it, most of them do single and double flare with the little die removed to make the double. If the pipe is just too long you could put a loop in it somewhere out of the way to get rid of a bit.

iiyama - 17/5/08 at 04:47 PM

Already cut it Pete, should have thought of putting a coil in it! The tool I have will definatly only do one type of flare. It grips the pipe and then a countersunk shaped tool runs into it creating the flare.

The base if the outlet is countersunk if thats a better discription. The flare I have put on the pipe is also countersunk.

britishtrident - 21/5/08 at 06:50 PM

quote:
Originally posted by iiyama
Already cut it Pete, should have thought of putting a coil in it! The tool I have will definatly only do one type of flare. It grips the pipe and then a countersunk shaped tool runs into it creating the flare.

The base if the outlet is countersunk if thats a better discription. The flare I have put on the pipe is also countersunk.


You need a proper brake flaring tool --- I wouldn't trust any flare made with the tool you describe.

Sounds like your are doing flare operation 2 only but to do flare operation 2 you need to do flare operation 1 first.

Standard flare a convex flair (in metric it should strictly be a bubble flare) --- this is operation 1 or OP1

A double flare is convex-concave, ie. it is the above flare followed by OP2 which makes a concave depression in the centre of the OP1 flare.

[Edited on 21/5/08 by britishtrident]

iiyama - 21/5/08 at 06:56 PM

DOne it bud, but thanks for the reply. Bought a tool in the end.