Silly quick question. Please would someone tell me if the flare on the metal brake pipes should be male (bubble) or double? The seat inside the union looks like it suits a male flare but I keep reading about "proper" double flare - is that right?
Phew. Already made a couple of pipes and fitted them. Just that I got spooked reading about doubles somewhere. As you were cap'n.
They are called single and double flares, Stoopid bubble flare No need to call it 24tpi and unf , Never interchange incorrect threads
I purchased a brake pipe set from a well established VW supplier and noted that the flare was a double when the pipes I was changing were bubble. I queried this with the supplier and was told to tighten them up it will be ok. So I packed them up and sent them back, purchased some Kunifer tube and a small hand held flaring tool and made my own all work well no leaks and are all Bubble, you can buy the tool at most good tool stores you don't have to rely on Flea bay
Nothing wrong with your response, were they definitely a "female" flare, i.e. top two pics in Snotty's post? I only ask as I know of a few brake pipe suppliers who recommend using the bubble flare on ISO/DIN female seats. They crush slower, so you have more chance of getting a good seal in a production environment (i.e. where you're not tightening them until they don't leak, you have to prescribe a standard torque). DIN flares are an absolute nightmare if you're doing a lot of them. Never use a female flare on a female seat though, you'll tear the flare off before you make a seal. RE naming conventions- it's all mad, so don't worry if someone corrects you. Top two flares are officially described as type E, bottom right are type F, if using the DIN standard, but something else entirely to the ISO standard, even though they're exactly the same flare.
The pipe sets I purchased were double flare whereas on Tilly 75 bay the pipes removed were bubble flare I appreciate your input but the info I received from the supplier was definitely wrong
Got them all done bar the two to the master cylinder - not sure which of the master cylinder connections is for the front circuit and which is the rear. Can some kind soul tell me if it matters which way around they go? Also, what sort of sealing washer should be on the brake light switches - anyone know please?
The connection at the front of the master cylinder goes to the rear port of the pressure regulator for the rear brakes. Rear port on the master cylinder for the front brakes. No sealing washer on the brake light switches.
Thanks guys. I can make my last two pipes now - funny that not one of the books I found tells you this. Where did you find that diagram Westy? It was Bentley that says to use sealing washers on the switches - I've now found someone else pointing out that it's an error.
I pulled the drawing from VWH but it’s a copy out of the factory manual. C&C have a similar drawing. Bentley is very good but there are a few errors, although I haven’t noticed that one. What page shows the sealing washers? I’ll scribble a correction on my copy.
