Originally Posted by Mike
Anymore brake lines are all custom work done at a shop. Get yourself a 25 ft roll of tubing , a kit and go to town.
Already there and have the T-shirt.
But that'* not necessarily the only option... Classic Tube has prebent kits for many cars, pre-2000... and newer trucks. GM'* awful brake lines have spurred on cottage industry. However, they don't stock a 2004 GP kit.
The problem with a running the lines yourself is that the W-bodies are just too tight and inaccessible to fit the lines in properly, so you end up with them rubbing and vibrating, which can make them brittle and corrode. And if you don't eliminate the flexible stainless braided part, all of your unions end up behind the ABS pump... and you don't find out which might decide to leak until you bleed the system. To fix the leak, you have to tear out the master cylinder and ABS and if your lucky you can crank the unions a quarter turn tighter in a very confined space. Then put everything back together... bleed again and hope for no leaks.
That'* where I am. I have had to pull the system apart three times now for unions leaking... and I await bleeding it again. Contrary to appearances, I am VERY good at making inverted double flares, but the old GM line sucks... and I am questioning the unions I got.
At some point, if I can't get the system bled, I'm going to have to try the older prebent GP kit from Classic Tube, as I can't deal with so many points of failure (leakage) that all these unions create.
I was comparing the parts diagrams on naleygmc.com... and the 1999 and 2004 GPs both use the same exact picture... the fronts are part "9" and the rears are part "28". Even the most of the part numbers are the same, though the descriptions make it sound like they aren't the same part.
1999 GP with JL9 - Rear RH: 10407739 Rear LH: 10407740 Front RH: 10335973 Front LH: 10425230.
2004 GP with JL9 - Rear RH: 10407739 Rear LH: 10407740 Front RH: N/A Front LH: 10425230.
For $240 I could buy them from GM... or for $239, I can get the entire car in stainless from Classic Tube... _IF_ the 1997-2001 parts would fit on a 2004.
I'm leaning towards the idea that they will fit. I suppose I could call them and ask just how exact these are... compared to the OEM stuff.