[Rev.Vassago]

At the risk of repeating myself (which I'm clearly doing), where the hell are the wheel chocks?

[BIG JEEP on 44's]

Originally Posted by TomB985

BJ, if you are implying that one braking axle is just as good as three, you are out of your mind. If you don't believe me, try it for yourself!

Get a nice, heavy load, at 5 MPH in a parking lot, and pull JUST the yellow button...and see how powerful that ONE axle is. Then, try again, pulling BOTH buttons, setting both trailer axles and tractor axle.

Not sure why ANYONE would ever do that! It's not like it takes more than a second or two to release your trailer brakes...Just setting the tractor brakes because you THINK it's good enough is RECKLESS.

A nice heavy load at 5 mph is more energy than an unloading at a dock should produce...or do you not realize how much energy is there to be stopped at 5 mph with a 40-47k lb load ...And I've never had any issues at docks with just trator set...and that's real life not interet theory of a pretend driver or wanna be future driver...Now I have seen drivers who have set their trailer breaks in cold weather while at a dock for a coupe hours end up with stuck trailer breaks...LOL dumb-A$$ .

[BIG JEEP on 44's]

Originally Posted by Rev.Vassago

At the risk of repeating myself (which I'm clearly doing), where the hell are the wheel chocks?

And these should be provided by receiver ,but obviously were not .

[Rev.Vassago]

Originally Posted by BIG JEEP on 44's

And these should be provided by receiver ,but obviously were not .

So that makes it okay not to use anything to chock the wheels then, right?

I'm sure the TMC driver had blocks of wood somewhere on his truck that he could have used. And yet, he didn't.

[BIG JEEP on 44's]

Originally Posted by Rev.Vassago

So that makes it okay not to use anything to chock the wheels then, right?

I'm sure the TMC driver had blocks of wood somewhere on his truck that he could have used. And yet, he didn't.

A wheel chaulk is a wheel chaulk a piece of wood is a piece of wood ...

[Windwalker]

Originally Posted by BIG JEEP on 44's

A nice heavy load at 5 mph is more energy than an unloading at a dock should produce...or do you not realize how much energy is there to be stopped at 5 mph with a 40-47k lb load ...And I've never had any issues at docks with just trator set...and that's real life not interet theory of a pretend driver or wanna be future driver...Now I have seen drivers who have set their trailer breaks in cold weather while at a dock for a coupe hours end up with stuck trailer breaks...LOL dumb-A$$ .

First of all, the fools that only set the tractor brakes at the loading docks are the very reason that many places will not load or unload if the wheels are not chocked. I've been on a surface that was slick enough, that with the brakes set on tractor and trailer, and a chock in front of two trailer tires, when the forklift went into the trailer and stopped, the rig slid forward enough to drop the dockplate. And, two docks over, the truck also slid ahead, but enough to bunp the trailer of a truck parked in front of him.

In the pics, as the load was being driven off the truck, the weight shifted from the drives to the trailer. I'ts entirely possible that the driver DID engage the tractor brakes. But, without the trailer brakes engaged as well, the inertia of the load moving back could have moved the rig forward. May not sound possible, but I've hauled farm machinery before. Some of them can do some very strange things. Wish I had pics of some of them.

Also, who ever was on that AG tractor should have realized that the wheels were turning, but wasn't getting any closer to the dock.

[Rev.Vassago]

Originally Posted by BIG JEEP on 44's

A wheel chaulk is a wheel chaulk a piece of wood is a piece of wood ...

I guess you've never unloaded at a place that uses 4X4 blocks of wood as chocks.

Every Menards hardware store in existence comes to mind. And they use them for flatbeds too (like they should).

[TomB985]

Originally Posted by Orangetxguy

Doing that to a truck's brake system is reckless. The system is designed to be activated AFTER the equipment has come to a complete stop, using the service brakes. This is a good way to damage hardware components.

The brake cylinder pushes on the pushrod, which pushes the slack adjuster, which (most of the time) rotates an s-cam, which presses the brake linings against the drums, creating friction and stopping the truck.

Whether you apply air pressure to the brake chamber to provide the force, or vent the air pressure holding back powerful springs to do it(parking brake)....you're doing the same thing.

[Orangetxguy]

Originally Posted by TomB985

The brake cylinder pushes on the pushrod, which pushes the slack adjuster, which (most of the time) rotates an s-cam, which presses the brake linings against the drums, creating friction and stopping the truck.

Whether you apply air pressure to the brake chamber to provide the force, or vent the air pressure holding back powerful springs to do it(parking brake)....you're doing the same thing.

Yes Tom...You can "pop" the brakes at 5mph to stop the truck. Your still going to cause component failure, because the "Spring Brake" is not designed to stop a moving truck. It is designed to hold in place a stopped truck.

Once you pull the buttons, you have no recourse. You don't have time to release the brakes to prevent damage. Damage to components can include damaged "S" cams, pads pulled off of rivets, blown brake chambers and even drums can be cracked, from the inertia of the moving vehicle.

Big Jeep had it right when he made this statement;

A nice heavy load at 5 mph is more energy than an unloading at a dock should produce...or do you not realize how much energy is there to be stopped at 5 mph with a 40-47k lb load ...

:hellno::hellno::hellno::hellno:

[TomB985]

I don't agree, but this isn't the time, place, or thread for an argument...

Regardless, he certainly should have set his brakes and chocked his wheels...driver error, IMHO...:angryblue: