Do you need an ABE and what the TÜV says to the valves?
You do not need a separate ABE (general operating) for the use of Stahlbus ® bleeder valves.
The Stahlbus ® bleeder valves were examined by the TÜV Rheinland Group through its paces.
In one of the toughest salt spray test the corrosion resistance of Stahlbus ® bleeder valves was detected - hence a hard winter use will be no problem.
The strength of the Stahlbus ® bleeder valves have been demonstrated in a torque overload test with values as well. But this is not a license for strong-arm tactics - the tightening torques specified in the manual must be adhered to.
And so grab your brakes even tomorrow powerful, in an endurance test were 125 000 full braking successfully simulated. Even after the last maneuver, the function of Stahlbus bleeder valve was fully guaranteed.
You can see details here in PDF format: TUV 944-7119076-2_stahl_EN.pdf.