TECH Query AUTOHOLD

[Dartiguan]

Driving long distance in the Tig I began to wonder if I should leave the autohold system active while on the highway. How does this function work mechanically/electronically. Is it liable to add to rotor and/or pad wear because of trailing against the brakes or is it a function of the DSG and may affect clutch wear. Either way does it add to fuel consumption by increasing rolling resistance.

I think this is an important question for fuel use (primary reason I bought the car) and would love to hear from those more technically adept.

At present I turn it off on the highway and engage it in the city, as it is a useful feature in stop start city driving. Thanks for any replies.

[Captain Bungers]

Hey Dartiguan,

As far as I understand, if you have switched it on it will be activated electronically when you hit the brakes. I would be surprised if it affected your efficiency etc. I have a manual with the autohold, so it is not dependent on the dsg to work.

Sent from my X10i using Tapatalk

[NZTiguan]

I understand it actually functions on the ABS system, almost in reverse, by maintaining brake pressure that you've placed in the lines with the footbrake and so stopping the wheels rotating (rather than the usual ABS stopping the wheels locking). So, it only maintains brake pressure you've applied and therefor should have zero effect on a moving vehicle.

Cheers

[team_v]

I understand it actually functions on the ABS system, almost in reverse, by maintaining brake pressure that you've placed in the lines with the footbrake and so stopping the wheels rotating (rather than the usual ABS stopping the wheels locking). So, it only maintains brake pressure you've applied and therefor should have zero effect on a moving vehicle.

Cheers

This is my understanding.
It will only come into affect once the vehicle has stopped moving as well so if you press the brakes to slow down but want to keep driving it will not be activated.

[NZTiguan]

This is my understanding.
It will only come into affect once the vehicle has stopped moving as well so if you press the brakes to slow down but want to keep driving it will not be activated.

AND if you just roll to a stop with little or no brake pressure it won't always "hold" completely, you need to press the brakes firmly to engage it.

Cheers

[team_v]

AND if you just roll to a stop with little or no brake pressure it won't always "hold" completely, you need to press the brakes firmly to engage it.

Cheers

Ahhh cool, i didn't know that one.

Also it won't activate if you have no seatbelt on.