Go Back   EcoModder Forum > EcoModding > Off-Topic Tech
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-13-2021, 08:37 PM   #1 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 9,988
Thanks: 0
Thanked 1,188 Times in 1,049 Posts
Would a modern car with drum brakes all-around still have a chance?

I'm sure most people have already been totally convinced that disc brakes may be inherently "superior", even though economy cars and some trucks still resort to drum brakes at the rear-end. But it's worth consider how drum brakes retain a foothold on the heavy-duty truck market, even though it's most noticeable on models meant to feature off-road capability.


Among the reasons why I still see a lot of trucks with drum brakes all-around is they're often pointed out to be less prone to have its friction surfaces in contact with contaminants, which is a common issue on most rural environments. Then it turns out to question the suitability of all-around drum brakes for an economy car, considering not only the manufacturing cost which is still usually lower for a drum brake but also that not every farmer in countries such as mine may afford a medium-duty 4WD truck for instance.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-14-2021, 10:11 AM   #2 (permalink)
Somewhat crazed
 
Piotrsko's Avatar
 
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 2,246
Thanks: 216
Thanked 619 Times in 532 Posts
Well the truck brakes are massive, almost filling the offset area of a 20" rim and sticking out from the rim.. You also downshift for hill descent which cars typically don't do as well as being more aware of traffic and driving slower. OTOH, my daughter is complaining to KIA about her rear discs making noise after driving on a dirt road.

I would think that truck discs would be bigger and heavier than the equivalent drum brake
  Reply With Quote
Old 07-14-2021, 10:34 AM   #3 (permalink)
Eco-ventor
 
jakobnev's Avatar
 
Join Date: Oct 2010
Location: sweden
Posts: 1,559

Princess - '92 Mazda MX-3 GS
House of Tudor
Team Mazda
90 day: 53.54 mpg (US)

Shirubāarō (*´ω`*) - '05 Toyota Prius Executive
Team Toyota
90 day: 54.88 mpg (US)

Blue Thunder - '20 Hyundai IONIQ Trend PHEV
Team Hyundai
Plug-in Hybrids
Thanks: 68
Thanked 640 Times in 404 Posts
Send a message via MSN to jakobnev
Maybe cheap electric cars will bring back four wheel drums.
__________________




2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
  Reply With Quote
The Following User Says Thank You to jakobnev For This Useful Post:
Ecky (07-17-2021)
Old 07-14-2021, 12:04 PM   #4 (permalink)
home of the odd vehicles
 
rmay635703's Avatar
 
Join Date: Jun 2008
Location: Somewhere in WI
Posts: 3,535

Silver - '10 Chevy Cobalt XFE
Thanks: 403
Thanked 754 Times in 565 Posts
Quote:
Originally Posted by jakobnev View Post
Maybe cheap electric cars will bring back four wheel drums.
Actually expensive electric cars are pushing for high performance drum brakes due to the ease of eliminating brake drag
, there are “supposedly” other benefits as well but maintenance sucks, so there is that.
  Reply With Quote
The Following User Says Thank You to rmay635703 For This Useful Post:
Isaac Zachary (07-18-2021)
Old 07-14-2021, 07:10 PM   #5 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 9,988
Thanks: 0
Thanked 1,188 Times in 1,049 Posts
Quote:
Originally Posted by jakobnev View Post
Maybe cheap electric cars will bring back four wheel drums.
Either hybrids or full-EVs can be OK with drum brakes as they do regenerative braking.
  Reply With Quote
Old 07-17-2021, 05:35 PM   #6 (permalink)
JSH
AKA - Jason
 
JSH's Avatar
 
Join Date: May 2009
Location: PDX
Posts: 2,254

Adventure Seeker - '04 Chevy Astro - Campervan
90 day: 17.3 mpg (US)

Dieselgate - '14 VW Jetta Sportwagen TDI
90 day: 38.24 mpg (US)
Thanks: 164
Thanked 1,246 Times in 855 Posts
Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
Either hybrids or full-EVs can be OK with drum brakes as they do regenerative braking.
The VW ID series has drum rear brakes because it is RWD and the electric motor does the vast majority of braking. Drums also make a parking brake easier.

However, plenty of reviews of the car dinged it for having "cheap" drum brakes without looking into the engineering reasons why.
  Reply With Quote
The Following User Says Thank You to JSH For This Useful Post:
Vwbeamer (09-03-2021)
Old 07-18-2021, 01:51 AM   #7 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 9,988
Thanks: 0
Thanked 1,188 Times in 1,049 Posts
Quote:
Originally Posted by JSH View Post
Drums also make a parking brake easier
No wonder the drum-in-hat parking brake layout is so common among cars with disc brakes all-around.


Quote:
plenty of reviews of the car dinged it for having "cheap" drum brakes without looking into the engineering reasons why
Even though some reviewers do have a decent knowledge base, it seems like they try to behave much like they would expect Average Joe to do, including such disregard to a simpler technical approach when something else fancier is available in a comparable product from some other manufacturer.
  Reply With Quote
Old 09-02-2021, 01:12 AM   #8 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 9,988
Thanks: 0
Thanked 1,188 Times in 1,049 Posts
Recently I had a talk with a friend who worked for a while at the Brazilian branch of Scania, and he is still more favorable to drum brakes on heavy-duty trucks.
  Reply With Quote
Old 09-02-2021, 10:17 AM   #9 (permalink)
Somewhat crazed
 
Piotrsko's Avatar
 
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 2,246
Thanks: 216
Thanked 619 Times in 532 Posts
The only down side to drum brakes that I know of is dumping the friction heat on twisty roads or long downhills. I know of big rigs water spray cooling on the drums, but that is frowned upon.
__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
  Reply With Quote
Old 09-02-2021, 10:59 AM   #10 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 9,988
Thanks: 0
Thanked 1,188 Times in 1,049 Posts
Quote:
Originally Posted by Piotrsko View Post
The only down side to drum brakes that I know of is dumping the friction heat on twisty roads or long downhills.
The fitment of engine-braking devices and some transmission-mounted braking retarders (either electro-mechanical or hydraulic) may compensate at least a little of the burden which would otherwise be on the brakes.


Quote:
I know of big rigs water spray cooling on the drums, but that is frowned upon.
I have never seen any water spray cooling of the drums on any big rig in my country.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com