Rob Edwards

FWIW, on the GTS I measured the front right, left rear, and PSD lines, they're all between .1965 and .2000 (5-5.1mm - ish) My measuring skills suck but they're definitely not 6 mm lines. My guess is they're 3/16" or 4.75 mm line and maybe Porsche put some sort of coating on them (?)

http://www.fedhillusa.com/ has 3/16" Cunifer lines and a dizzying array of nuts- Why is it that there are literally 10 SAE and metric thread pitches that all work with 3/16" brake line?


thread resurrection hijack:


This is interesting to me, I'm installing a set of Goodridge hoses on the GTS and have had nothing but trouble with them- the banjo bolts for the front calipers are too long (banjo bolt 20 mm, caliper thread+ banjo+ 2 crush washers = ~18mm) , the front hose couplings don't fit into the 'D'-shaped mounting brackets (oh, just dremel the bracket), the supplied 'U' clips don't secure the lines to the bracket (keep the factory ones and use them, they fit fine) Now I found a puddle of brake fluid under the left rear where the flex line connects to the hardline. I wonder whether I'm seeing what Jon928se is describing? The right rear appears to be fine.

/thread resurrection hijack

S4ordie

Someone else recommended Classic Tube. I have used them on other cars in the past and they produce a very good product and it fits first time every time. They may already have a CNC template for your MY 928. Worth a call to get it right.

http://www.classictube.com/

Bill Ball

Are the mating/sealing problems mentioned above, said due to wrong thread length, seen with the 928Intl Goodridge SS sets? I just installed a set on an 87 and did not notice anything other than the coupling to the rigid line would not fit through the front mounting bracket (it was not a problem with the clips), although it fit fine in the rear. That aside, I saw no problems with the set. I saw no leaks or thread length mismatch issues, but I'd like some confirmation that the thread problem mentioned here does not involve the 928Intl sets.

Rob Edwards

Hi Bill-

Timely post from you, I was just coming on to recant my post-

I just bounced my experience off of Greg and he said he's never seen any problems with the thread depth of the rear line couplings- I think my problem is either that I crossthreaded the damn thing or I failed to keep the area clean and there's some crap in the fitting ( I pulled the calipers and lines and then proceeded to clean the undercarriage... ) I did have to grind down the banjo bolts for the front lines to get them to tighten on the calipers- Greg had not seen that problem and figured that someone at Goodridge must have put the wrong length banjo bolts in my kit. (Mine were 20 mm, FWIW, I shortened them to ~17.5 mm.)

Bottom line, the 928Intl sets are fine. Just make sure that the included hardware kit matches up with the factory bits if you're going to use them.

Greg is aware of the round coupling not fitting in the D-shaped bracket and has mentioned it to the folks at Goodridge before. FWIW, he said that he sees badly corroded rear hardlines all the time and he keeps a bunch in stock. Definitely something to check for.

Bill Ball

Rob: THANKS for clearing that up!

GregBBRD

When I first became a Goodridge dealer, the brake lines for the 928 were the wrong length and had the wrong fittings on them. I told them what they needed to change...and then they turned it over to "engineering" to be checked. Those changes took about 8 months to get approved and actually get lines the right length and with "close" to the right fittings. This was after I bitched and bitched to get them corrected....to everyone that wasn't listening, obviously!

They don't make the fitting with the "notch" cut out of it to keep it from rotating...why would they? These fittings are only found on about 10 zillion different vehicles!

Here's what I have discovered, in my business dealings with Goodrodge: The company is owned and run by the British. There are Brits here, running things, too.

Enough said? Perhaps not.

I've heard the Germans called "cement heads". I've heard many funny quotes about Germans...."You can tell a German, but you can't tell him much", is an appropriate example, for this discussion. However, I've never met a German that is anywhere near as slow and pig headed as the Goodridge Brits. Goodridge survives, in this country, in spite of themselves. If they didn't make and distribute the best hose products found on earth, they would have been gone...long, long ago.

I've got a sign hanging in my back room that I go by and touch, which acts much like a 50mg tablet of Valium, on particularily bad days of trying to deal with Goodridge:

"Somedays I think Goodridge is actually the Goodwill and I'm dealing with the mentally handicapped!"

My apologies to the Goodwill and the good people working there, but this pretty much tells the whole story.

BC

Does goodridge have any Teflon lined hose in the -10 sizes? Maybe I should check the website, but I thought may you would be familiar with their other sizes.

GregBBRD

Absolutely.

We are now using teflon hose to plumb almost all new race vehicles. I just finished plumbing a brand new 7200 race truck in our 910 series, which is a Kevlar covered teflon hose. This hose is simply the very best hose made, for this application. I used over 200' of this uber light, uber trick hose. I'll post a picture....it's a bit "busy".

We are completely redoing all of the factory transmission, fuel, and oil lines in Dan Hebert's two 928's, with this hose. This hose, very simply, will last longer than the car!

BC

Well, then I guess I have a solution for any short sections that cannot be done with the -10 SS hard line I have. I need teflon because of the ethanol. Such as from the hard line under the car to the two fuel rails, back from the fuel rails to the return hard line, and some stuff at the back. -10 SS thin wall tubing is very difficult to bend.

kccampro

Anyone know what the thread pitch is for factory porsche nuts? I'm going to use 4.75mm lines from fedhillusa.com but now I need to do some recon to figure out what the correct nuts are I need to order.

Bigalrut

Did you ever get a reply or figure out the correct tube nut size for our Porsche 928 brake lines?

Zirconocene

If you're talking about the ones that connect to the calipers, they're M10x1, 12mm long from the bottom of the "nut" portion (where you put the wrench) to where it makes contact with the flare of the tube. There are some unthreaded portions in that 12mm.

Cheers

Bigalrut

Thanks! I was also curious about the tube nut size for connections to the rear brake tee and to the ABS. I'm measuring M10x0.85 versus M10x1.0.

Zirconocene

TBH, I haven't been back that far for work on my car's brakes, but if I had to guess, it's more likely to be a 0.8 thread on what you're measuring. That's quite a fine pitch for that nut size; I am used to seeing that on M5 and M6 bolts.

Hopefully someone more knowledgeable can jump in.

Cheers

Bigalrut

I was able to measure again. My mistake. They are M10x1.0. Thanks for the assist.