View Full Version : Boost Leak Tester Question

05-20-2007, 12:54 AM
Used the http://a4mods.com/index.php?page=webcontent/pages/boostleak.html design to test for a boost leak

How do you know when you dont have any more leaks?

does the system fully pressurize and the gauge reading on your air tool stay stable??

05-20-2007, 08:06 AM
I clicked on yoiur link and couldnt figure out which type you made. But yes your gauge shouldnt go down any

05-20-2007, 09:39 AM
Well if you are still testing into the intake manifold there might still be a flow of air since the air can leak past the rings, but you will hear the air bubble in the oil so you know that isn't a leak.

05-21-2007, 10:18 PM
there's air leaking from this thing that looks like a long check valve, it attaches to the L tube near the the manifold. it sits near the firewall and leads to the brake booster.

i looked at bentleys and cannot find the name of this check valve looking thing. its 3 inches long

05-21-2007, 10:42 PM
does it have three ports going into it???? if it is I had to buy one today it is like $28 from the dealer... I will go get the part number

05-21-2007, 10:53 PM
Part number: 058 133 753B

For a 2001.5 Audi A4 1.8T

05-22-2007, 01:30 AM
thanks, what makes that part so important?