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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-06-2009, 04:31 PM   #1 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,543

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,306
Thanked 6,116 Times in 3,174 Posts
Hypermiling helped ruin my brakes. Toast after only 25k km / 15k miles

Search around and you'll find a couple of posts from me from the past whining about how my front brake rotors are always rusting up because (1) I don't drive my car much, and (2) when I do, I don't use the brakes very much/very hard.

To try to solve this, I actually got in the habit of trying to clean the rotors off by stopping pretty hard ... on those rare occasions that I do have to do "normal" braking.

But the rust apparently got further ahead than the pads could scrub clean, and the result is I've now worn the pads down to the wear indicator on the rough rotors!

Here's what they look like now:



Makes me think that cars with regenerative braking will have the same problem - possibly more than regular cars.

These may still be OK to be machined down; I haven't looked into it yet.

Attached Thumbnails
Click image for larger version

Name:	metro-rusty-brake-rotor.jpg
Views:	461
Size:	109.8 KB
ID:	3806  
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-06-2009, 04:33 PM   #2 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,107

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,431
Thanked 2,482 Times in 1,496 Posts
Looks pretty ugly Darin. Gotta do some preventative maintenance on your car!
__________________
Current project: A better alternator delete
  Reply With Quote
Old 07-06-2009, 04:39 PM   #3 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,543

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,306
Thanked 6,116 Times in 3,174 Posts
Sorry for the lousy pic: the pitting is pretty significant. Sand paper is not an option.
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 07-06-2009, 04:39 PM   #4 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,543

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,306
Thanked 6,116 Times in 3,174 Posts
Vaseline on the rotors!
__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 07-06-2009, 05:04 PM   #5 (permalink)
Master EcoModder
 
McTimson's Avatar
 
Join Date: Sep 2008
Location: Nyack, NY
Posts: 309

BMW - '97 BMW 318ti
Team BMW
90 day: 32.45 mpg (US)
Thanks: 1
Thanked 5 Times in 5 Posts
You don't use the brakes anyway though, so what's the big deal?
__________________
  Reply With Quote
Old 07-06-2009, 05:15 PM   #6 (permalink)
Driving the TurboWeasel
 
Join Date: Mar 2009
Location: Steuben County, NY
Posts: 459
Thanks: 14
Thanked 18 Times in 17 Posts
Ouch!

How about adding ~200 lbs to the car so you use your brakes harder?

Those look pretty gnarly. Take them to a brake-turning place, there may be hope for them yet.
__________________
2012 Chevrolet Cruze Eco 6MT
  Reply With Quote
Old 07-06-2009, 06:19 PM   #7 (permalink)
Master EcoModder
 
tasdrouille's Avatar
 
Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672

The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
Thanks: 35
Thanked 81 Times in 53 Posts
I personally think it's not so much the hypermiling as you not driving your car frequently. If I remember right, you can go a full month without using your car. Time is rust's best friend, it lets it work its ways.

Is there something you could spray on that prevents rust, but does not interfere with brake pads? That sounds like a tall order.

BTW, What do the rear drum brakes look like?
__________________



www.HyperKilometreur.com - Quand chaque goutte compte...
  Reply With Quote
Old 07-06-2009, 07:32 PM   #8 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,732

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,571
Thanked 3,507 Times in 2,194 Posts
I told you about WD40 right?

Yup, I bet 4 wheel drums would look just dandy.

I just got through unsticking (derusting) some Metro front brakes. Not only was the rust building up in the grooves for the piston seals and dust seals, pushing them against the pistons so they wouldn't retract, but the pad cradles had rust under the stainless pad seats, pushing them tight to the pads so they weren't free to move either!

I hate disk brakes on cars.

On yer disks tho', having them turned would likely get rid of most if not all the pits.
  Reply With Quote
Old 07-06-2009, 07:39 PM   #9 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
I pretty much never have rotors turned, only because they're so cheap to buy new. Turning them takes away heat dissipating material (although making them slightly lighter), thus making them more prone to warpage that one time you actually do have to stand on them. (Deer and bear don't stop for you around here.)

That does look pretty crappy, though... might be a good idea to spray them with WD-40 once a week or something to keep that from happening.. As soon as you touch the brakes, the lube will burn off and you'll have braking power.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 07-06-2009, 09:06 PM   #10 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,543

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
Thanks: 3,306
Thanked 6,116 Times in 3,174 Posts
McTimson: a philosophically interesting question. I've still got rear brakes...

Martin: I agree, it's probably more the lack of use than the light braking. Come to think of it, having spent the winter in the salt air of the east coast must have been extra hard on them. I had to oil my bike chain on the beater bike about twice a month all winter to keep it from rusting solid.

I'm a slow learner Frank. Seems it has to cost me money before I learn my lesson But after I replace/machine these rotors & change the pads, I will try WD-40 if I know I won't be driving for a while. Of course, smooth wheel covers complicates things a bit...

__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
New personal record: 632 miles on 1 tank. 48 MPG in my Auomatic 05 Corolla blackjackel Success Stories 6 11-30-2009 01:02 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com