kaneelschep
Well-known member
Hi all.
I have been rummaging with a limp mode and sinking brake pedal issue for some time now.
Had a sweaty buttcrack situation twice of sudden no brakes.
In normal situation also cannot make the wheels block or abs out with pedal on normal surface.
I basicly swapped and checked all vacuum lines. changed n75 valve and the rubber which connects the main vacuum pipe to the brakecilinder through the firewall.
That made a big difference allready.
Went from always limp mode quickly when power was asked, to just sometimes.
When it works, it always has plenty of boost and feels powerfull enough like any tdi I driven without issues.
Now after about 3000/3500 rpm the boost sort of ends. When I continue it will go into limp mode.
That is quite a given.
But sometimes it will just go into limp mode cruising in 5th gear asking no power at all.
Maybe related to going over bumps/holes. Well or it was coincidence.
We have a lot of holes in the roads here
So I know a few things on these cars suck.
The pipe coming from the brake cilinder to the engine.
I checked that pipe. Nothing wrong with it.
Where it goes in the rubber through the firewall sucks. I changed the rubber.
Brake cilinder itself sucks.
it looks good. And dont want to change a 250 euro part for nothing.
Is the connection flange on the vacuum pump supposed to be able to turn?
it does.
So while typing this I found this:
http://forums.tdiclub.com/showthread.php?t=457763
I guess I found an issue
Gonna read more about that.
but maybe someone can comment and confirm?
Thanks!
I have been rummaging with a limp mode and sinking brake pedal issue for some time now.
Had a sweaty buttcrack situation twice of sudden no brakes.
In normal situation also cannot make the wheels block or abs out with pedal on normal surface.
I basicly swapped and checked all vacuum lines. changed n75 valve and the rubber which connects the main vacuum pipe to the brakecilinder through the firewall.
That made a big difference allready.
Went from always limp mode quickly when power was asked, to just sometimes.
When it works, it always has plenty of boost and feels powerfull enough like any tdi I driven without issues.
Now after about 3000/3500 rpm the boost sort of ends. When I continue it will go into limp mode.
That is quite a given.
But sometimes it will just go into limp mode cruising in 5th gear asking no power at all.
Maybe related to going over bumps/holes. Well or it was coincidence.
We have a lot of holes in the roads here
So I know a few things on these cars suck.
The pipe coming from the brake cilinder to the engine.
I checked that pipe. Nothing wrong with it.
Where it goes in the rubber through the firewall sucks. I changed the rubber.
Brake cilinder itself sucks.
it looks good. And dont want to change a 250 euro part for nothing.
Is the connection flange on the vacuum pump supposed to be able to turn?
it does.
So while typing this I found this:
http://forums.tdiclub.com/showthread.php?t=457763
I guess I found an issue
Gonna read more about that.
but maybe someone can comment and confirm?
Thanks!
Last edited: