So the following statement is not true?
A Drum brake is more efficient than an equivalent sized disc brakes.
Its a irrefutable fact.
Says who? Please show the irrefutable evidence
Are we really going to go over all this again?
My points were
1. I learned the correct way, eventually, in 2000. That means I have been setting tire presssure correctly for the majority of my driving years.
- That it’s only human to look for tire pressure info on the tire first. I picked a random car (Porsche) and searched “tire pressure” in thread title on a Porsche forum. I got back hundreds of threads titled “What tire pressure should I use for my 911/944/Cayenne/etc.?”
A question that could have been answered simply by opening ones driver door and looking down the side of the door pillar. Or looking inside the gas lid.
Eventually, most drivers figure it out: Most critical documentation, abut tires and loading, what oil to use, etc. is affixed to different parts of the car itself. People just need to learn to start opening doors, hoods, and decklids or hatches, and start reading what’s on those little placards.
(Something that should be taught in high school home ec instead of baking cookies, or taught in shop, instead of building pencil holders).
Gosh I hope not.
It’s a simple request. Please provide a link to a reputable source that supports this assertion. No comments on your part, you are not an expert on brake effieciency.
In only ONE way is that true. The drum brake will provide greater braking torque at the same hydraulic pressure than a disk brake will. This is true of all variations of drum brakes.
Disk brakes are, however, superior in every other measurement which is why we use them.
In that case, wasn’t it “Everyone has a plan until they wake up with a throbbing headache, a missing tooth, and a tiger in the bathroom”? 
“Drum brakes actually are better for 2 reasons, they clamp harder and they are better for fuel economy because they have less resistance and rotational weight. However, the reason discs are used today is for their fade resistance. Drums do not dissipate heat as well as rotors. Take identical cars with the sole exception of front drums vs front discs and the drum brake car will stop shorter the first time. After that, the disc brake car will stop shorter.”
Thank you for proving disc brakes are better when you need them most.
You don’t know the meaning of irrefutable evidence. In fact, your video proved the OPPOSITE.
So as long as you only have to hit your brakes once while driving your good… Gotcha, makes perfect sense…
Must be nice to live out in BFE with zero curves and or hills, much less other vehicles on the road… Oh yeah, I guess no large animals running out in front of you…
Pfffftttt, I live in a curvy, hilly place with lots of other vehicles on the road, as well as it is nothing to see at least 9 deer most every evening just in my yard in my subdivision alone, I have seen as many as 20 deer running through my yard, not to mention the other deer seen elsewhere out and about depending on what time of day…Heck, there is multiple ways to get out of my neighborhood and I have to hit my brakes 3 time minimum just to get to the main road…
I think I will stick to my front disc brakes thank you…
EDIT forgot the word deer a couple of times… lol
By and large, drums have more weight than the equivalent rotor in a disc setup. Additionally, if you were to add all the components required for either set up, likely the drum equipped axle will have more unsprung mass and that is worse for fuel economy, not better.
The part that is right is that drums can have less parasitic friction since you can adjust them to do that. This used to be something the drag racing crowd around me did- because it sounded good on paper. Whether or not there was any measurable difference is a contentious debate. Discs normally retract as a function of the square shaped seal rocking in its groove, creating tension in the seal as the brakes are applied. When pressure is released, the seal returns to its relaxed shape and position and this pulls the piston back slightly, reducing pressure on the pad. Slight runout in the rotor will tap the pads back from the rotor surface as it rotates. Properly adjusted drum brakes will also have some parasitic drag but it can be relieved entirely (at least until properly functioning self-adjusters restore the proper positioning) if you purposely loosen the adjusters. One could argue that drums, with more surface area, should have greater parasitic drag under normal conditions…
I don’t have enough time to research it right now especially since my computer broke snd I have to do everything on my phone now. There are several white papers that are out there tgat get into the math of braking systems.
At the end of the day disc brakes are the people’s brake, more forgiving and universally loved forget the efficiency.
Drum brakes are still used when braking power really matters such as in my work vehicle which is s triaxle dump. Semis still largely use drums for a reason. Truck drivers typically drive in a way that brakes are not constantly applied so the fading that drums tend to have is not an issue.
In the 1960s GM designed not only the best drum brake ever made but arguably the most sophisticated foward thinking brake ever made, the 8 lug drum brake.
The engineering and craftsmanship of this design is unmatched. Kelsey-Hayes really knocked it out of the park and they really are an engineering marvel if you take tge time to read about them and appreciate them, most can see this.
They have an advantage in trucks, especially construction trucks, due to their resistance to foreign matter getting on the braking surface. It is much harder to deflect stuff from a disc brake than a drum brake. So for vehicles that routinely operate in environments subject to dust/dirt/mud/rocks etc, a drum brake is preferred.
There’s a reason they have runaway truck ramps in the mountains. When was the last time you saw a personal vehicle up one of those? 
Hint-hint, four-wheelers?
Whether or not the Ford Trimotor came with disc brake, the two I flew in had discs.
Notable Early Applications
- The Lanchester Motor Company designed a disc brake system in 1902, but it was not practical for widespread use.
- Disc brakes were primarily used in aircraft before World War II
In 1929, while the technology for disc brakes existed, it had not yet been adopted for use in standard passenger cars. Most vehicles at that time still relied on drum brakes.
(sighhhh)
Where, in the name of all things holy, is that?
(these d a m n e d acronyms!)
I guess some people have never gone through a large puddle and have their drum brakes fail when getting to the other side. Or have tractor trailer drum brakes lock up frozen in the winter after stopping for a while. It’s just my opinion but disc brakes stop a lot better. I guess that’s why they put them in the front of the vehicle, or all 4 corners. and they are easier to change then drum brakes.