Jake Break Question

Topic 6479 | Page 1

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Eckoh's Comment
member avatar

This is from a logic stand point...

The jake break slows only the drive tires so you are not supposed to use it in slick conditions. However down shifting also only slows the drive tires... so why is down shifting better in slick conditions then the jake?

David's Comment
member avatar

This is from a logic stand point...

The jake break slows only the drive tires so you are not supposed to use it in slick conditions. However down shifting also only slows the drive tires... so why is down shifting better in slick conditions then the jake?

That's actually something I'd like to know.. I never thought bout that.... Good question sir..

I'll take a guess tho, think it has something to do with the amount of torque going to the tires.. using the Jake, I think, uses more power then down shifting, which can cause the tires to break free.

That's my guess . Maybe someone else has an answer.

Eckoh's Comment
member avatar

double-quotes-start.png

This is from a logic stand point...

The jake break slows only the drive tires so you are not supposed to use it in slick conditions. However down shifting also only slows the drive tires... so why is down shifting better in slick conditions then the jake?

double-quotes-end.png

That's actually something I'd like to know.. I never thought bout that.... Good question sir..

I'll take a guess tho, think it has something to do with the amount of torque going to the tires.. using the Jake, I think, uses more power then down shifting, which can cause the tires to break free.

That's my guess . Maybe someone else has an answer.

You can turn down the jake though going from 4th to 3rd at 1000 rims will be the same every time, won't it?

PR aka Road Hog's Comment
member avatar

I don't know this for sure either, but if I understand it correctly, the engine brake is exactly that, a brake. And in slick conditions, you don't want to ride the brake, as that can cause a slip or spin out. By down shifting, you lower the rpm's, thus slowing your speed, and the torque, which can also play a part.

Just my 2 cents worth.

OWI:

Operating While Intoxicated

David's Comment
member avatar

I don't know this for sure either, but if I understand it correctly, the engine brake is exactly that, a brake. And in slick conditions, you don't want to ride the brake, as that can cause a slip or spin out. By down shifting, you lower the rpm's, thus slowing your speed, and the torque, which can also play a part.

Just my 2 cents worth.

That's sounds more reasonable then what I put. Makes more sense too.

OWI:

Operating While Intoxicated

Eckoh's Comment
member avatar

I don't know this for sure either, but if I understand it correctly, the engine brake is exactly that, a brake. And in slick conditions, you don't want to ride the brake, as that can cause a slip or spin out. By down shifting, you lower the rpm's, thus slowing your speed, and the torque, which can also play a part.

Just my 2 cents worth.

But a jake slows the engine not the tires.

OWI:

Operating While Intoxicated

David G.'s Comment
member avatar

I don't know this for sure either, but if I understand it correctly, the engine brake is exactly that, a brake. And in slick conditions, you don't want to ride the brake, as that can cause a slip or spin out. By down shifting, you lower the rpm's, thus slowing your speed, and the torque, which can also play a part.

Just my 2 cents worth.

The reason you should not use the jake in slick conditions is because it multiplies engine brake force. Take your foot off throttle at cruise speed and the truck slows a little, use the jake and it becomes more. Because the effects are instant on deceleration, if you take your foot off throttle, the response is instant and abrupt. Using lower gears is a conscience decision, and not reactive as the jakes. They also say it because downshifting with the jake on when slick is most often catastrophic. Its also easy to forget that its on. The cruise can not be set on my truck (2015 Cascadia) if the jake is on for that very reason.

OWI:

Operating While Intoxicated

Eckoh's Comment
member avatar

double-quotes-start.png

I don't know this for sure either, but if I understand it correctly, the engine brake is exactly that, a brake. And in slick conditions, you don't want to ride the brake, as that can cause a slip or spin out. By down shifting, you lower the rpm's, thus slowing your speed, and the torque, which can also play a part.

Just my 2 cents worth.

double-quotes-end.png

The reason you should not use the jake in slick conditions is because it multiplies engine brake force. Take your foot off throttle at cruise speed and the truck slows a little, use the jake and it becomes more. Because the effects are instant on deceleration, if you take your foot off throttle, the response is instant and abrupt. Using lower gears is a conscience decision, and not reactive as the jakes. They also say it because downshifting with the jake on when slick is most often catastrophic. Its also easy to forget that its on. The cruise can not be set on my truck (2015 Cascadia) if the jake is on for that very reason.

Thanks

OWI:

Operating While Intoxicated

Ricky A.'s Comment
member avatar

Personally i would not downshift in slick conditions either outside of gear recovery. In other words i would just leave in high gear when coming to a stop.

Brett Aquila's Comment
member avatar

Using the foot brake is certainly the safest way to slow the truck in slick conditions. Any sudden jolt to the drive tires like a harsh downshift into the high end of the RPM range or kicking on the Jake Brakes can break the tires to break loose.

Also, on slick roads be extremely careful about using any brakes of any sort while going around a curve. Try to get down to the proper speed before entering the curve. And of course kicking on the Jakes on slick roads while in a curve is about the most dangerous thing imaginable.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

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