Question about shifting: Is my instuctor correct?

Engaging the clutch brake will not cause the engine rpm to drop, as the clutch brake only stops the clutch disc and transmission input shaft to stop turning. If the vehicle is in gear and moving when you engage the clutch brake, then the brake will be trying to stop the entire truck - something it's not designed to do.

Here's a video that demonstrates proper double clutching technique:

 

For 2 more weeks,

do what you're told.

Get your cdl, and move on.


Alot of these instructors, don't like to be corrected. No matter how wrong they are !!





Don't believe it,

just read some of the training posts .......

 

i just press my clutch an inch or two in and then change the gear.HOWEVER if i am at a dead stop i press my clutch all the way in.

 

...the video of "double Clutching" on page 3 is correct...
...the clutch pedal does not have to be fully engaged...just enough to "break torque"..of the drive-train.
...about 1"-2" of pedal travel to disengage and shift..depending on the type of clutch assembly..(hydraulic or cable or rod )

...the post earlier from Eaton , is correct also..IMO..
...engaging the clutch pedal all the way is used to engage the clutch brake
(it's only a small rotating metal disc)
and start the clutch brake to slow down the entire rotating assembly...
....dead stops only...

....me personally, while shifting, I use the clutch pedal about 50% of the time, but while up shifting, it really isn't needed..
...because the driver is the "synchronize r"..cause the trannies don't have synchronizer's...

...I have heard that on average, over 40% of MOST drivers do not know to double clutch correctly...
...not my opinion.....and given the amount of AUTOS TRANS being used these days...it might be correct...

crusin

 

That's just one of the things you'll find that you do in school but don't do on the road. Do what you need to do to get passed and get going but you'll learn later that you hardly use the clutch anyway. He sounds like a very effective and enlightening teacher who is cranking out some very top-notch drivers. (if you could hear me you would note the heavy sarcasm in my voice! No offense to you tarheel...)

 

I used to push the clutch in about 1/3 of the way at most. Just enough to get the shifter out of gear/into gear. Any further, and you are engaging the clutch brake. Practice double clutching long enough to get your CDL. After that start learning how to "float" gears without using the clutch. You can shift faster, reduce wear on the clutch... And oh yeah, it is less fatigue on you.