Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Thread Tools
Old March 10th, 2012, 16:43   #1
Veteran Member
Join Date: Dec 2006
Location: Va
TDI(s): 2000 jetta
Default How hot should your brake discs be after driving??

Just curious as to how hot other folks rotors get whilst driving?? I checked mine mine after getting home today, very minor braking on the way home and all 4 rotors were too hot to hold your finger on. Is this normal?
alloutdoorsboy is offline   Reply With Quote
Old March 10th, 2012, 17:14   #2
Veteran Member
Join Date: Dec 2007
Location: Olympia, WA
TDI(s): '04 Golf

Should be. The pads make contact albeit lightly all of the time. There's going to be heat and the fact that you cannot hold on to it means it's, what, 130 - 140 degrees? Too hot to handle but not at all "hot."
2004 Golf GL PD TDI
Malone Tuned, SBC Stage II Daily, Nicktane Cat 2 fuel filter, Dieselgeek bypass oil filter, Whitedog intake hose fix, A4 Defender skid plate, GLI Recaros, Check Temp III, Ventectomy, LED trunk lighting mod, Volx glass headlight lenses, VR6 front and wagon rear springs. Koni FSDs all around. FrostHeater with bumper mounted plug-in mod (details here).
OlyTDI is offline   Reply With Quote
Old March 10th, 2012, 17:58   #3
Veteran Member
Join Date: Dec 2006
Location: Va
TDI(s): 2000 jetta

This low highway MPG is driving me nuts!! So I just went out and got on a highway and drove for 5 mins at 60mph without using brakes and came to a stop on an incline without using brakes. Rotors felt cool, guess just slowing down a bit to turn into my driveway does heat the rotors that hot. OK on to other things.....Guess the injector pump is next....
alloutdoorsboy is offline   Reply With Quote
Old March 10th, 2012, 18:20   #4
Veteran Member
slamhouse's Avatar
Join Date: Oct 2011
Location: Stanwood, WA
Fuel Economy: Better than 95% of cars on the road

Ive personally had one bad caliper. after driving three corners were too hot to touch, the bad one, the heat could be felt 3 feet away, and the whole rim was hot to the touch.

That was on my 95 pathfinder, not my jetta

Brakes can get very very hot under normal use as all that is slowing you down is friction between a ceramic pad and a metal rotor, in which friction translates directly into heat.
slamhouse is offline   Reply With Quote
Old March 15th, 2012, 10:17   #5
Join Date: May 2011
Location: warwick ny

Sorry to hijack the tread but.
my front driver side rotor gets very hot, changed caliper , hose, rotor & pad.
help !!! going nuts.
lucho is offline   Reply With Quote
Old March 15th, 2012, 10:56   #6
Veteran Member
otbBlaine's Avatar
Join Date: Feb 2006
Location: Orange County, Ca
TDI(s): 2002 Golf
Fuel Economy: 44ish regularly

I received a nice second degree burn on my leg from my rear disc on my bicycle, and both rotors will boil water off of them after anything but mild downhill runs.

A 4000lb car requires a whole lot more energy to stop; if there's no smoke or burning smell there's nothing to worry about.
A man who procrastinates in his choosing will inevitably have his choice made for him by circumstance.
otbBlaine is offline   Reply With Quote
Old March 15th, 2012, 11:21   #7
Veteran Member
Join Date: May 2009
Location: South Africa

Remember... to stop a vehicle kinetic energy is converted into heat, mostly in the brake pads and discs... also a relative low (in machinery terms) temperature, I think, 60 Celcius, is too hot to touch..
Silver VW Jetta A4 TDI 2002 AHF, 421 000km, MAF and EGR delete
(VCDS Hex + CAN, ALH/AHF tools, BRM/BXE tools)
White VW Jetta A5 TDI BXE, 505 000km
Jettascuba is offline   Reply With Quote
Old March 15th, 2012, 11:22   #8
Veteran Member
Join Date: Oct 2005
Location: Il.USA
Fuel Economy: 43/41/40

Jack up the rear of the car with PB off and see how easily the wheel will spin. IIRC, somebody here said the wheel should spin freely for one and a half revolutions.
JB05 is offline   Reply With Quote
Old March 15th, 2012, 16:44   #9
Veteran Member
Join Date: Aug 2007
Location: Wheeling, WV
Fuel Economy: 42/37 best/worst-99% hwy. No city only mpg.

Occasionally, our cars can have a sticking e-brake cable that won't always stick. I had that on mine before changing cables. I have also read of other causes....I think vacuum booster issues maybe.

2004 Jetta GLS (5A). 296,000 miles. Bone stock.
04SlvrJetta is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Must brake discs be replaced every time along w/ pads? SAABMaven TDI 101 38 January 7th, 2012 14:16
Hot rear brake PeterUpNorth TDI 101 17 September 6th, 2009 19:44
anybody use upgraded brake discs here cog Upgrades (non TDI Engine related) 3 October 14th, 2008 09:27
312mm x 25mm Brake Discs $49.00 ea. Occams_Razor Upgrades (non TDI Engine related) 7 June 25th, 2006 11:34
Front and rear brake discs???? bulverde Private TDI Items for Sale/Wanted 2 January 15th, 2003 17:30

All times are GMT -7. The time now is 14:34.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.14322 seconds with 10 queries
[Output: 87.64 Kb. compressed to 74.77 Kb. by saving 12.87 Kb. (14.69%)]