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Brake pipe union size
#1
Hi,  can someone please tell me the size of the brake pipe union that screws into rear brake cylinder .
Just had a nightmare afternoon, ordered a brake pipe online looked good, removed old pipe from car.
screwed one end of new pipe into place carefully routed pipe in place only to find the pipe end union was smaller than required at wheel cylinder. Had to remount old brake pipe +  bleed the brakes so I can use the car .
  Any way Ive decided to buy a tool  and make my own in future .
  So would be appreciated of all pipe thread + size info used on my 2004 1.4 berlingo. Rear drum brake + ABS .
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#2
(28-11-2021, 09:18 PM)fordconsul73 Wrote:  Hi,  can someone please tell me the size of the brake pipe union that screws into rear brake cylinder .
Just had a nightmare afternoon, ordered a brake pipe online looked good, removed old pipe from car.
screwed one end of new pipe into place carefully routed pipe in place only to find the pipe end union was smaller than required at wheel cylinder. Had to remount old brake pipe +  bleed the brakes so I can use the car .
  Any way Ive decided to buy a tool  and make my own in future .
  So would be appreciated of all pipe thread + size info used on my 2004 1.4 berlingo. Rear drum brake + ABS .

I replaced the rear drums + cylinders on mine and could not at all undo the cylinder brake pipe union at all. At the end used plumber's pliers and the union nut/bolt was completely rounded. I bought these: https://www.ebay.co.uk/itm/114773258244
and they were a perfect fit for my M59 2007 (1.6HDi, rear drums + ABS).
I also thought to buy a tool + pipe + brake unions, but would use it only once so at the end decided to buy the pre-fabricated ones. If I have kept the old pipe I would measure the sizes. I think I threw them away, but will double check. I think the cylinder union nut is larger diameter than the other end.
smile, you are alive!
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#3
The cheap pipe flaring kits are just that - it is not easy to get a really good end shape and you'd have to use copper pipe, which means buying a reel. 
I have a kit and pipe that I've used a few times, but I'd suggest getting the right ones ordered in at your motor factors - they'll have new unions, rather than you using your old ones, probably be of coated steel .  A small 'local' garage might have a professional tool and if you take your old pipes they'll swap the fittings over and make the pipe up.
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#4
Kunifer pipe is the best aftermarket alternative and it's not expensive. It's a lot easier to work than steel pipe and more durable than copper. Just go into your local spares shop for unions they are probably M10x1 and cheap enough.
So where does this bit go then ?
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#5
(30-11-2021, 09:28 AM)ffrenchie Wrote:  Kunifer pipe is the best aftermarket alternative and it's not expensive. It's a lot easier to work than steel pipe and more durable than copper. Just go into your local spares shop for unions they are probably M10x1 and cheap enough.

Hello again, I did order a new brake pipe for my Berlingo this came with M10x1  unions at both ends. unfortunately the brake cylinder connection has a larger thread size than 10 mm . I should have measured the union size at the brake cylinder when it was removed but it was 0 degrees outside and was not in the best of moods having to refit the old brake pipe back into place !
  Brake pipe + unions and a flaring tool are easy to purchase locally . Just need to know the correct thread size .
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#6
(30-11-2021, 12:08 PM)fordconsul73 Wrote:  
(30-11-2021, 09:28 AM)ffrenchie Wrote:  Kunifer pipe is the best aftermarket alternative and it's not expensive. It's a lot easier to work than steel pipe and more durable than copper. Just go into your local spares shop for unions they are probably M10x1 and cheap enough.

Hello again, I did order a new brake pipe for my Berlingo this came with M10x1  unions at both ends. unfortunately the brake cylinder connection has a larger thread size than 10 mm . I should have measured the union size at the brake cylinder when it was removed but it was 0 degrees outside and was not in the best of moods having to refit the old brake pipe back into place !
  Brake pipe + unions and a flaring tool are easy to purchase locally . Just need to know the correct thread size .

I think one is M10 the other M11 (cylinder). I forgot to check if I had kept them. I will check tonight and let you know if they are M10/M11.
smile, you are alive!
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#7
As far as I could measure, the cylinder pipe union is 12mm and the other side is 10m. Hope this helps.
smile, you are alive!
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#8
Thanks everyone for the advise on this subject I think the union is 12mm . During the remounting of the original brake pipe I gave  it a good clean with scotch-brite . The union/pipe has sealed up good so I think it does not need replacing anyway . The car has failed its EU Kontrol (Equivlent to MOT ) with a leak  between the brake pipe and cylinder .
I had recently disturbed the wheel cylinder whilst struggling with brake shoe springs so it was probaly a little bit of brake fluid not cleaned off properly rather than leaking I believe .
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#9
I recently had to replace slightly weeping rear brake cylinders - you are correct in that the connecter is 12mm rather than the usual 10mm fitting. Of course undoing the cylinder pipe fitting twisted the brake pipe, so that had to be replaced. If you get a flaring tool like this
https://www.ebay.co.uk/itm/273669758110?...OSw5HJXK4f~
it is very quick and easy to make perfect flared ends - just remember to slide the fittings on first....
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