brake servo

[meganall]

when i turn the car off i can hear a air leak from the servo, it dies after about 1 minute but if i leave it, even overnight and pull of a vac pipe its still got vacum is that normal ??

[CharlesElliott]

Interesting - on my 2.5 TDi AKE I also hear a hissing sound after I leave the car for about 30 seconds. I was going to post on here to ask what is was likely to be......

[meganall]

Interesting - on my 2.5 TDi AKE I also hear a hissing sound after I leave the car for about 30 seconds. I was going to post on here to ask what is was likely to be......

I've got the AKN and beeen having poor performance since I rebuilt the engine so going through it bit by bit.
Went really well last night but cleared the fault codes and now back to half power
Only thing to change is maf and n75

[meganall]

The pipe was split by the vac pump so sorted that but still get the hiss from the servo??

[Peter D]

Pump the brakes with the engine off. Does the hiss stop. Do this the A/C off as that also hisses with the engine off. Regards Peter