Hi all, I was replacing O2 sensors on my 2007 Cayman S. All was going well, but when pulling a wire lead through on the driver side pre-cat unit, I broke a small tube off the part shown. What is it? Plastic tube was molded into the main plastic connector. Argh! Any help on what this is and how to replace it would be greatly appreciated! View from wheel well. Small broken tube was on top of connector housing. View from under the car. Firewall towards upper left.
Remove the pipe(s) so you can glue easier. Careful removing the smaller one from the rubber hose, and replace the rubber hose if it's a bit tired. I'd build-up a decent amount of glue around the joint area to make it stronger, as it's certainly a weak point and a new one will as easily break, gl
A little background for you. The big tube runs up to the front of the car and provides vacuum to operate the power assist on the brakes. The small rubber hose operates some "flaps" in the intake manifold system that "convert" the intake to a tuned resonance system at higher engine speeds. The default position, if vacuum is lost, is not damaging to the car but for best performance, you'd like it to be working. The round metal can with the Pierburg label is a mechanical vacuum pump that is powered of the end of one of the exhaust camshafts.
I looked through the PET. I think you want drawing 604-015 Item 14. P/N 987 355 575 02 But with your photos, the guy at the parts counter will find it easily.
If it were me, I would buy the Porsche replacement part. It's going to be around $100, because the vacuum hard line is integrated into the fitting. You will always wonder if your repair is holding up. It is hard to spot a vacuum leak!
BTW, the replacement part goes from the vacuum pump a short distance (12"-24") forward, where there is a quick disconnect fitting. This will be under the plastic floor panel.
What is it? Plastic tube was molded into the main plastic connector. Argh! Any help on what this is and how to replace it would be greatly appreciated!
As others mentioned, it's a small line off the vacuum pump. Oddly, mine had broken off in some odd way that manifested itself in the brake pedal being very hard.
A post here regarding this and it led to this failure as well.
It's fairly easy to get at with the panel off behind the seats, also from under the car.
The line runs to a junction point in a channel on the driver's side. Just about near the door jamb/latch.
The tube end slides into the long tubing that goes to the booster.
I repaired mine with good 'ole JB weld as a temp.
Fixed vac tube
I did buy the replacement.
You may not wish to drive before this gets replaced. Your braking will be "hard".
Needless to say, it's dangerous doing this.
Boxster Bill,
When I replaced my four O2 sensors on my 2007 Boxster S in April 2024, I broke the exact same nipple that you broke. The info above is correct: the broken nipple is part of Brake Vacuum Line and the part number for my 2007 car was part number 98735557503. I ordered the vacuum line from Pelican Parts (about $111.00) and replaced it. On my car, the short piece of "flexible" hose that the nipple goes into to connect to the thin rigid vacuum line coming from the top of the engine (at least I believe that's where the thin vacuum hose is coming from) was no longer soft or very flexible, and the flexible hose sure as heck wouldn't pull off the rigid vacuum line, and I couldn't pull the broken nipple out of the flexible hose, so I purchased some new flexible hose at the local auto parts store. I had to use a sharp knife to cut the old flexible hose off the thin rigid vacuum hose coming down from the top of the engine, and it was tight working in the limited space under the car at the front of the engine. I then used the new flexible hose to connect the thin rigid vacuum line to the nipple on the new Brake Vacuum Line. I believe the inside diameter for the flexible hose needs to be about 3.5mm. If you need to replace your flexible piece of hose, if you want to buy OEM, I believe the flexible hose made for these types of vacuum line connections should be Porsche Hose 3.5x2x120mm part number 00004320499 and costs about $21 vs. about $7 to $8 for a similar size hose at the auto parts store.
If you are interested in what the small vacuum line is operating, read my article linked below. The discussion starts about a 1/3 of the way through the article.
Boxster Bill,
This info may help, as well. To remove/replace the Brake Vacuum Line, the end near the nipple is obviously a simple press-to-release fitting. For the other end of the Brake Vacuum Line (the smooth end), that fitting was a type I was not familiar with. See the last post at this link where the Mitch48 explains how to release the smooth end of the Brake Vacuum Line: https://www.planet-9.com/threads/how...r-hose.105540/
If the link doesn't work, here's Mitch48's verbiage: "I got the hose/pipe out. Turns out there is a black friction lock in the end of the white connector. I pried it out about 1/8" and then the pipe twisted right out. Easy once you know how, which is half of what a mechanic charges for."
@harveyf , @ClemCLone , @teejerdude : Thanks for the excellent information. This is a really great community!
I did a JB weld repair as shown for temporary. Thanks for the PN and connection information on the new part. All very helpful! I did have to carefull cut the flexible hose to get the small pipe out. I haven't been able to find the right size vacuum line for the connector at the local shops yet. If I strike out, I'll be ordering online or stopping by the Porsche dealer Monday.
