Jake Brake Info

It will shut off on newer trucks with electronic engines. It will not shut off on older trucks,it will stall the truck.

 

Some will agree with this and others will be vehemently opposed, but I base my opinion on my experience. I always "drag one foot" or keep 2 cylinders or 4 cylinders engine braking in both rain and snow, depending on conditions.

By dragging one foot, you start a smooth decceleration (or for you physics wizards "negative acceleration" ) as soon as you release the throttle so when you apply the service brakes, some slowing has already occurred. This makes for more controlled braking, and reduces the possibility of loss of traction.

The deccelerating force of 2 cylinder engine braking is less than the accelerating forces of the throttle. By that I mean, if road conditions were such that you could lose traction by dragging one foot, you would also lose traction by applying power to the drive axles (accelerating).

So, if you could get up the hill without lossing traction, it is safe to drag one foot down the hill. If road conditions are so bad that you lose traction while accelerating (you see your tach jump and hear your rpms increase for a second and then return to normal while your speed remains constant) IMO, it's not time to use your jakes....it's time to park.

 

Everybody is different on the use of the engine brake. I'm old school and proud to be and I guess I can't say what it will do on slick roads because I've never tried it. I don't like to deal with emergencies because I was taught to avoid them. I use the engine brake on grades and no where else. I don't drive where I need extra braking power on flat roads but some drivers do to save the wear on the brakes. I just saw no need for it.

Just about all of my driving for the past 10 years have been with very heavy trucks. It was nothing to load and weigh over 100,000lbs. I've had the misfortune of coming down some serious grades heavy with no engine brake and in all the time I've pulled these loads I've only smoked the brakes once. And that was my fault because I didn't stop at the top and check the brakes. The engine brake is a tool to add to your safety. They all recommend not to use them on wet or slick roads. I guess I might use the engine brake in rain if I had only one trailer on and it was loaded fairly heavy. But I would have to think real hard about since there's really no need for it if you go down the grade correctly. Besides the rain will cool the brakes.

I may come down slow but I'll be the one passing the trucks that are on the side of the road with smoke pouring out. Once you come close to loosing your brakes I guarantee you'll look at every grade with the seriousness it deserves. So I agree with mtrhd.

 

Ain't that the truth.

 

I have a question,i remember when you use ac the truck loss hp ,what happen with the jake brake or engine brake.when iam drive with enginebrake what happen i loss hp or not thanks for the anwers

 

You should know when the jake is on...

I guess in one respect you lose HP when the jake is active... you're using the engine to slow you down.

Just having the switch on the dash doesn't do anything other than mean you go right to jake when you left off the throttle. The engine actually can't run with the engine brake on, its only fueling the engine or retarding the engine, not both.

 

When i drive whit jake brake i spend more fuel or not

 

Found this in an article I read:


A Jake Brake modifies the timing on the exhaust valves so that, when braking is desired, the exhaust valves open right as the piston reaches the top of the compression stroke. The energy gathered in the compressed air is released, so the compression stroke actually provides braking power.

Also all fuel flow to the engine is stopped while the Jake Brake is applied.

The main advantage of a Jake Brake is that it saves wear on the normal brakes. This is especially important on long downhill stretches.

 

Thanks for you helping only the last question is the jake brake to change or everytime the same ,when is to change how many miles to drive

 

What ?