EX-brake ?

[B-rock]

Not sure if my exhaust brake is staying on during a no throttle coast, Not all the time but sometimes when say... pulling off the freeway to an exit right as i let off and start to coast I can feel/hear the exhaust brake come on... . Great!

Then it seems that the truck will down shift and the exhaust brake turns off and will stay off??



again sometimes it will pull me hard down to around 25MPH other times it feels like it's not opperating??



as soon as i start the truck i turn the brake on and leave it on. I will also drive using the TOW/haul button. with the truck in the tow/haul mode the exhaust brake will seem to work a bit better, but still will sometimes apear to "turn off" mid way thru the coast down.





Any ideas?

 

[Drdorian]

The brake is dependent on RPM, not speed. At what RPM do you notice it kick out?
In tow/haul it will be more effective as your auto will change its shift pattern and keep your RPM's high.

 

[Wolfy]

Not sure if my exhaust brake is staying on during a no throttle coast, Not all the time but sometimes when say... pulling off the freeway to an exit right as i let off and start to coast I can feel/hear the exhaust brake come on... . Great!

Then it seems that the truck will down shift and the exhaust brake turns off and will stay off??



again sometimes it will pull me hard down to around 25MPH other times it feels like it's not opperating??



as soon as i start the truck i turn the brake on and leave it on. I will also drive using the TOW/haul button. with the truck in the tow/haul mode the exhaust brake will seem to work a bit better, but still will sometimes apear to "turn off" mid way thru the coast down.





Any ideas?

Previous discussion at TDR on this topic finds that it is common experience that the exhaust brake cuts off at about 1100 rpm.



Your speed will vary depending upon which gear you are in when you begin the decelleration.



I am not sure how tow-haul effects this cut-off point.

 

[PaulBarker]

your e brake will come on to at idle weather you are coasting or not, thats if the engine is cold or if it thinks it is

 

[B-rock]

Thanks for the input, I watched my tach today as I noticed the ex brake turn off and yes. It opens at around 1100 RPM. I suspect that with a trailer pushing me they would stay up high enough to keep the exhaust brake on. I was hoping it would stay on until I got down to say 15 or 20 MPH. Maybe in the future it can be an option.

 

[KEpperly]

You can also manually down shift in normal mode. witch down shifts alot smother then tow haul mode does