Author Topic: Brake booster nipple part number?  (Read 2497 times)

April 20, 2012, 06:36:08 am

Turbofan

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Brake booster nipple part number?
« on: April 20, 2012, 06:36:08 am »
Anyone got it? I foolishly snapped mine the other day and have yet to find a suitable replacement. Help! Driving with no power brakes sucks, though it fondly reminds me of my type 1 days...

Reply #1April 20, 2012, 01:43:15 pm

Turbofan

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Re: Brake booster nipple part number?
« Reply #1 on: April 20, 2012, 01:43:15 pm »
I called VW, and according to them, the nipple is part of the hard plastic line. This assembly was discontinued in January of 2010. Should anyone run into this problem and you aren't able to find a used replacement, here's my fix.
After cleaning the broken bits out of the booster grommet and hard line, I went to home depot and bought a PEX reducer, 3/4" to 1/2", I believe. I ground down the ribs on the 3/4" side and using a liberal amount of silicone spray, worked it into the grommet. It will feel impossible to make fit, but it will. Next, use either a heat gun or (carefully use) a propane torch, slightly heat the plastic line at the tip just enough to soften it up, then slide it onto the 1/2" nipple sticking out. Road test to confirm fix. Drink a beer and celebrate that you just fixed your vacuum line for $1.69.

Reply #2April 21, 2012, 09:18:56 am

bbob203

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Re: Brake booster nipple part number?
« Reply #2 on: April 21, 2012, 09:18:56 am »
this is good news I snapped mine off when pulling a motor the other week.
92 Passat wagon M-TDi
03 Jetta wagon TDi
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Need a car transported a long distance? Pm me for details.

Reply #3April 21, 2012, 10:42:22 am

libbydiesel

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Re: Brake booster nipple part number?
« Reply #3 on: April 21, 2012, 10:42:22 am »
The plastic nipple has an integral check valve.  Running without the integral check valve will allow the vacuum booster to suck oil mist from the crankcase on shutdown.  I believe the oil mist will cause premature failure of the brake booster diaphragm.  There are certainly easy/cheap solutions but running just an open fitting may without a check valve may not be the easiest or cheapest in the long run. 

Reply #4April 21, 2012, 03:20:08 pm

Turbofan

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Re: Brake booster nipple part number?
« Reply #4 on: April 21, 2012, 03:20:08 pm »
Interesting. My setup surely didn't have a check valve there, but does incorporate one at the opposite end of the plastic line (the vacuum pump side). This check valve is also where the HVAC pulls it's vacuum source from. Maybe there are 2 styles of the booster line, as there are 2 styles of vacuum pump? I kept the other half of the broken fitting (the one one that was lodged into the booster) and it didn't appear it was anything other than a nipple. I'll check again though. As I still have a check valve in place on the pump, I don't believe I should be subject to premature failure. Had there been one on the booster too, that would have only kept vacuum in the booster itself, while the check valve on the pump would have kept vacuum in the pump/ HVAC system. Maybe I'll take a couple pictures so we can compare setups!