Jake brake 2011 prostar

Could be the contact in steering wheel button is shot.

 

On the dash it should light up "engine brake" in yellow letters.

To activate the engine brake you'll need to turn it on and then press the brake pedal. If you dont press the brake pedal then nothing will happen. I do believe there may be something wrong with your truck through

 

drty diesel, ur engine brakes are ur primary braking system. why would u have to use ur brake pedel (ur secondary system) to activate them?

 

Most newer trucks, the engine brakes do not activate until you press the break pedal, not like the older ones where you let off the throttle.

 

i would say u have a bad relay. its a hugh deal that ur jake brakes dont work. pls stay clear of any mountains and/or steep grades. ur truck should still be under a warranty. get it to a international dealer asap!!!!!

 

Like bayle said, these newer trucks aren't like the old ones. You don't have to press the brake pedal where the service brakes are applied, just have to press it hard enough to trigger the brake light switch and it will turn the jake on.

All the trucks I've driven are like that except for the n14 cummins I drove in school.

That way now I leave my jake on all the time and just tap the brake to activate then hit the fuel and it turns it off until you hit the brake pedal again

 

i drive a 2012 mack. and we have 7 new prostars in are fleet. all which work the same way. the purpose of a engine brake, in short is to save your service brake. i guess i dont understand why new trucks would be set up that way. ill do some reserch on the subject. but none the less. the issue is a big deal. no jakes means a wicked ride down a steep grade!!!!

 

Same here Drty, but you already knew that, and to sooper if you think a jake is your primary breaking system YOU need to stay away from hills and mountains.

 

It is to save your service brakes but you don't have to keep your foot on the pedal. You're not using your service brakes any more than normal while activating your jake this way. I guess they figure if your going to use your jake, then you're going to slow down, so why not activate it by using the pedal. Makes perfect sense to me