Whats does it do and how does it do it? Does Trac Off disable the antilock brakes?

 

There are two versions of traction control, ASC and DSC depending on model year. Your XKR would have ASC. Turning off ASC does not disable the ABS system. The ABS system is always active.

For a little more, check out this thread: https://www.jaguarforums.com/forum/x...dsc-off-70556/

 

Keith,

It gets even more complicated! This is from the Driver's Handbook describing the situation in the event of ABS warning light being illuminated whilst driving:

ABS Monitoring
The ABS control module monitors ABS electrical system from ignition ON to switch OFF. Any malfunctioning will be indicated by the anti-lock warning light coming on.

Should a fault develop in the ABS system, the brake system will still operate conventionally and with the same standard of performance as vehicles not equiped with ABS.

Reassuring to know the brakes still work effectively with the warning illuminated.

Graham

 

It's my understanding that ASC will apply braking &/or reduce power to specific wheels to prevent slipping or wheels turning at different speeds. I think.

 

The second day I had the car I was accelerating fairly hard onto an autoroute and hit a patch of black ice on the slip road.
I did a similar thing once in a LWB Land Rover and went through God knows how many cycles of piling on opposite lock with each oscillation getting bigger until the DBS (Ditch Braking System) operated. I was fortunate that the more aggressive TBS wasn't available on that bit of road.
Anyway Madame Jaguar produced the most extraordinary series of grunts and snorts and sorted herself out pretty much before I had time to react.
My passenger was most impressed at my driving skills.
I think if it hadn't been for DSC I'd have pranged it.

 

A great read! But, try as I may, I cannot parse TBS. Truck? Tree?

(I mentioned a few days back my own use of the WBS (woods) braking system with an old Saab. Effective, but tough on the paint.


Abby's guy: I think it's like this ...
- Early cars = ASC = can remove (pulse) braking to selected wheels or reduce throttle to keep rear end of car from overtaking front end of car.
- Later cars = DSC = can also apply braking in pursuit of same objective.

Someone please clean that up if I missed something.

 

I missed your WBS - exactly the same but Tree BS!
I think you're right with your ASC/DSC. The car actually'steered' into the skid although the wheel was straight ahead which I guess requires selective wheel braking.