roomabuzzy

1988 Audi 90 Quattro - Replacing ALL the brake lines. Don't have any information on what I need and I don't really have time to measure things. If anyone can provide me with the following information that would be great:

1. Total length required
2. Line diameter
3. There's a flex-hose near the front of the lines, not sure why it's there, do I really need it?

If anyone knows the answers to this, I would really appreciate it. Thanks!

tecknoquatt

<b>Front brake line hoses:</b> [per ekta 7.0 1988 Audi 80/90Q]


#171 611 701 L (2) M10X1X335 male/female ends
#893 611 707 (2) M10X1,0X285 female/female ends
#893 611 775A (2) M10X1X160 [to caliper] male/female ends
#893 611 721 (left)(1) 174MM male/male ends
#893 611 722 (right)(1) 174MM male/male ends


<b>Rear Brake line hoses:</B>

#893 611 775 (2) M10X1,0X250 [to caliper] male/female ends


note: quantities are in parentheses

the list above does not include the hard lines, just the soft lines. I do not know answer to your flex line question. sorry.

roomabuzzy

thanks for the answer... but I don't understand it =S

squidix9

are for the flexible hoses at every corner.

The hard lines are 6mm. You can either buy pre-cut and flared pieces up to typically 51" and you can then put as many together as you need. A lot of shops do it this way to avoid having to flare the ends yourself. As far as labor hours it's more cost effective. Plus I like it becasue you can get lines coated for corrosion which up here in the Northeast is a good thing.

I've never done "all" the lines at once. But to estimate take out the tape measure and go underneath to see which circuits go to each wheel then measure front to rear and out to each wheel and then up to the distribution block. Overestimate by a lot to take into consideration bends.

If you go with pre-cut you'll also need unions too.

If you go with a spool of line you'll then need nuts and a "good" bubble flare tool. A lot of places may suggest 3/16" tubing but you'll have to drill out the nuts to fit and when you make the flares they won't be exactly the same.

roomabuzzy

ya, I'll be doing the lines myself, and buying them in bulk so I need to know what I need. I don't really have time to get the car hoisted up and measure all the lines, but I'm guessing I probably have 25ft or so. The bundles are sold by 25ft so I should be ok with just one. As for the diameter, I'll just go out to the car and measure one. Thanks!

roomabuzzy

How do I go about measuring it without hoisting it? I can "guesstimate" how much I need like that, but there are so many little turns everywhere that it makes it hard.

Also, thanks for the diameter. I hope I can find 6mm. When I looked in the store the other day, all I could find were in inches, but I'll have another look.

squidix9

I'm thinking it's actually 4.75mm which is ~3/16"

ETKA shows it as 6mm but I think it's smaller.

roomabuzzy

Ok, so I went with a caliper to measure the diameter of the brake lines and it ends up they're 5mm (.2") so I'm guessing that the best thing to do would be to go for 3/16 lines. If that's not exactly the size I need, does it make much of a difference?

Also, I don't know what kind of adapters I need for the lines, and I can't take one off right now since there's still fluid in the system. So I have 2 questions:

1. Is there a way to tell what kind of adapter I need without taking it out?
2. Are all the adapters going to be the same in the car? Or can there be more than 1 kind?