Engine Brake Question

OK mr super trucker..

i've done the difference myself..and the truck I had at the time the jakes in combo of the svc brakes vs svc brakes..the jakes and svc brakes stopped the truck 4 feet shorter..oh..and I didn't leave so much as a skid mark on the asphalt either...

fer eery action there is an equal and opposite reaction..

As far as maintenance on that KW..My maintenance was fine..the previous owner's..not so much

Petey

 

The truck manufacturer has nothing to do with it...you're still adding stress to the entire driveline, which WILL shorten the service life of those components. It'll happen on a Kenworthless, Petercrap, Freightshaker, Vulva, Mack, or any other truck. If you use the driveline to stop the truck, you are causing wear to the driveline, just like you are causing wear on the driveline when getting up to speed. If you use the brakes to stop the truck, you are causing wear to the brakes. Either way, you are wearing out components. The driveline was designed to get the truck moving, the brakes were designed to slow it down. Each component has it's use.

Brakes aren't all that expensive. Even if you put new shoes on each year and new drums every other year, its still averaging less than $2.75/day....$0.01/mile. If that's going to break the bank, it should be the least of your worries.

And it's funny that you bring up fuel mileage, too...because I believe in spec'ing a truck to do the job you're going to ask the truck to do so that you can do the job without tearing up the truck. Fuel mileage is an afterthought with me. Build the truck right to get the job done with the least likelihood of breaking down or getting stuck, because the money you lose while you're in the shop getting fixed or lost loads waiting to get pulled out adds up to more than you will save by saving those couple tenths per gallon. If you can't afford to do the job in a properly spec'd truck, you should be charging a higher rate.

 

Well mr super trucker..you can err to the side of wear and tear on your u joints..I'll err to the side of safety and shorter stopping distance when he need arises for it

~rolls eyes~

Petey

 

Again, if your service brakes are already capable of applying enough stopping force to the tires to lock them up, there is no possible way the compression brakes (or any other additional braking force applied to the tires) are going to do anything to reduce your stopping distance any more than that, because if you lock up the tires you will increase your stopping distance. This "shorter stopping distance" is a myth, unless of course you aren't applying the service brakes in the most effective manner during your test. Either that or the service brakes on your truck are not functioning properly.

Ignorant drivers like you who insist upon using their compression brakes when they are not necessary are the reason why many towns pass ordinances prohibiting their use. Hell, I drive a truck and even I want to punch .45" holes through the trailer when some ####### rolls through town with his compression brake barking through a set of straight pipes. There is no reason for it.

Compression brakes have their purpose...to help control your speed while rolling down a hill to keep your service brakes from overheating and fading, thereby maintaining your ability to stop the truck if you need to. On flat ground, especially in town, there is no good reason to use them.

 

Umm..who said anything about running them in town...?

Those signs are up for he trucks that are runnin 8-12 inch barely baffled or completely unbaffled stacks for one..and for two..even with the switch on I can drive and downshift without activating the jake when I need to..and if I have to stop or take my foot completely off the fuel in those situations that are NON emergency it only takes a quick hand movement to shut it off..

I have NEVER been ticketing for braking a no jakes law anywhere..and as long as the exhaust is baffled like it was from the factory the jake isn't any louder than the engine is itself anyway..after all..even a compression brake..the exhaust still goes up the pipes..it doesn't suddenly become an unmuffled exhaust so if someone does forget in a STOCK truck..they probably won't be ticketed anyway as its only a change in tone..not a change in noise level on stock exhaust.the baffles mute the burble.

so..like I said before..you err to the side of your U joints.I'll err to the side of safety..

You are slamming your brakes on so hard in an emergency stop that it locks up your axles..me with my jakes on on the highway don't have to slam em on that hard..which means I have more control over my truck than you do while you are skidding your tires..after all..you can't turn a truck if the steers are locked up..or keep the truck in a straight line if the drives and trailer are locked..so you go on and skid wildly there mr super trucker..I'll come to a nice..SHORTER controlled stop

~rolls eyes~

Petey

 

How fast were you going for this test?

 

55

Petey

 

It's a "compression-RELEASE" brake, for tater's sake ! no t a compression brake ! do you knuckleheads even understand how it works ? cuz if you don't even understand how it works you got no business telling whether someone should be using it or not. And I can tell from a couple of the comments, some of ya's don't know what it does.

 

At 55 just how did you measure so accurately? Heck, at that speed if you were 0.05 seconds later in starting to slow down that alone would account for the 4' difference.

 

Is ot rocket science driver..a 300 foot paved area..a post and to mark starting point..and cnes to mark position of bumper..and someone on the radio...

basically the same way that brake distance tests are done everywhere and its done on multiple runs that are then averaged


Petey