What It Is
A vacuum line that supplies vacuum to the brake booster, running between the booster and the vacuum pump mounted at the end of the camshaft.
Why This Line Fails
The line is partially made of plastic, which makes it prone to cracking over time. It's also a common spot for clogging, which can cause problems reaching back to the turbo. A cracked or clogged line often shows up as a low or sinking brake pedal, and replacing it commonly resolves that symptom.
Fitment
Mk4 TDI with the ALH engine code only.
Common Questions
How do I know if this line needs replacing?
A low or sinking brake pedal is a common symptom, along with turbo-related issues if the line has become clogged.
Why does this line fail so often?
It's partially made of plastic, which is prone to cracking as it ages.
Does this fit BEW or other engines?
No, this line is specific to the ALH engine code.
