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Checking for leaks > < Connect the Brake servo testerVAS 6721

Leon Mk2

Checking the vacuum
Checking the vacuum
  Note
t  The average earth atmospheric pressure at sea level is 1.013 mbar and falls the higher you travel (approx. 100 mbar / 1,000 m height). The regional and periodic deviations also influence the vacuum.
t  A cold engine, an air conditioner compressor switched on as well as an idling engine have a negative influence on the vacuum.
–  Visually inspect all vacuum hose for damage (e.g. cracks or vermin bites - in some countries) and their tight fit in advance.
–  Connect the Brake servo tester -VAS 6721- → Chapter.
–  Open the shut-off valve -A-.
   
–  Close the shut-off valves -B and C-.
–  Start the engine at operating temperature (> 60° C), press the accelerator briefly once (engine speed more than 2.000 rpm).
–  Read-off the measuring value displayed.
Normally (see note), the vacuum generated is between 600 and 950 mbar, depending on the engine power output.
If the measuring value is not attained despite fulfilling the basic requirements (see note), first check the vacuum system for leaks.
–  For comparing, use the hand vacuum pump -VAS 6213- to generate vacuum. → Chapter
In order to make removing the hose connections and the adapter easier, open the shut-off valve -B-.
  N47-10210

Checking for leaks > < Connect the Brake servo testerVAS 6721