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Brake fluid question #4759259
05/16/18 09:35 PM
05/16/18 09:35 PM
Joined: Oct 2015
Posts: 263
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP
Joined: Oct 2015
Posts: 263
Washington
Would there be any benifit to using dot 4 over 3 in my cruze? I assume its oem fluid. Has 90k. I heard dot 4 is less hydro something meaning it absorbs less water over time vs dot 3. That would be a benifit to me. Im also tuned and i guess once a month it gets driven spiritedly. I did a quick stop from 110 mph down to 60mph and it had terrible terrible brake fade and it was mush for a few miles. Pads and rotors are good on front and rear drum has good shoes and adjusted right. Im thinking i over heated my fluid. I know its time for a fluid change and just debating on dot 3 or 4. Also the clutch shares the same resivor as the brake fluid.


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Brake fluid question [Re: Dylan1303] #4759268
05/16/18 09:42 PM
05/16/18 09:42 PM
Joined: Dec 2009
Posts: 25,588
Regina, Saskatchewan, Canada
Garak Offline
Garak  Offline
Joined: Dec 2009
Posts: 25,588
Regina, Saskatchewan, Canada
I'd say it can't hurt to try, especially if the price is right. At the very least, it'll give you a very good bleed. I get Castrol LMA DOT 4 for cheaper than DOT 3 examples, so that's what I went with.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Brake fluid question [Re: Dylan1303] #4759299
05/16/18 10:15 PM
05/16/18 10:15 PM
Joined: Mar 2006
Posts: 9,176
Pennsylbammyvania
dailydriver Offline
dailydriver  Offline
Joined: Mar 2006
Posts: 9,176
Pennsylbammyvania
Some claim that DOT 3 takes on moisture slower than DOT 4, despite having a lower wet boiling point, so who knows. shrug

You could always use the good old standby, Ate Typ 200, which does actually claim to take on moisture at a much reduced rate vs. other DOT 4s.

Was it ONLY the RS version of the 1.4T Cruzes that got the rear disc brakes (or did even those come with drums)?

Re: Brake fluid question [Re: Dylan1303] #4759324
05/16/18 10:50 PM
05/16/18 10:50 PM
Joined: Oct 2015
Posts: 263
Washington
Dylan1303 Offline OP
Dylan1303  Offline OP
Joined: Oct 2015
Posts: 263
Washington
I have the rs package. Its the trim package that did inteiror stuff and better brakes/ bigger rims. I have the lt1 i think the lt2 has the better stuff


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
13 equinox 2.4 awd pp 5w30
Re: Brake fluid question [Re: Dylan1303] #4759326
05/16/18 10:51 PM
05/16/18 10:51 PM
Joined: Oct 2012
Posts: 4,777
Taiwan
Ducked Online content
Ducked  Online Content
Joined: Oct 2012
Posts: 4,777
Taiwan
Originally Posted By: Dylan1303
Would there be any benifit to using dot 4 over 3 in my cruze? I assume its oem fluid. Has 90k. I heard dot 4 is less hydro something meaning it absorbs less water over time vs dot 3. That would be a benifit to me. Im also tuned and i guess once a month it gets driven spiritedly. I did a quick stop from 110 mph down to 60mph and it had terrible terrible brake fade and it was mush for a few miles. Pads and rotors are good on front and rear drum has good shoes and adjusted right. Im thinking i over heated my fluid. I know its time for a fluid change and just debating on dot 3 or 4. Also the clutch shares the same resivor as the brake fluid.


Seen it claimed that DOT 4 is indicated for ABS systems for the lower viscosity, and for performance cars for the higher dry BP and the chemical heat resistance of the borates in it.

These properties are supposed to compensate for its higher water absorption, since you are supposed to, like, change it before this becomes an issue.

I don't have ABS, its very humid here, and I don't have a high performance car, so DOT3 wins for me, plus its about half the price.

Last edited by Ducked; 05/16/18 10:53 PM.
Re: Brake fluid question [Re: Dylan1303] #4759346
05/16/18 11:22 PM
05/16/18 11:22 PM
Joined: Mar 2008
Posts: 7,006
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,006
USA
The most important thing is that you change the fluid regularly. Most cars go to the junkyard with the original brake fluid and never get it flushed

If you want something with a higher boiling point, consider something like Bosch ESI6 or Ravenol DOT 5.1

Pep Boys caries Wagner Severe Duty brake fluid for about $15/qt

Re: Brake fluid question [Re: Dylan1303] #4759355
05/16/18 11:39 PM
05/16/18 11:39 PM
Joined: Mar 2012
Posts: 5,374
Colorado Springs
edyvw Offline
edyvw  Offline
Joined: Mar 2012
Posts: 5,374
Colorado Springs
Originally Posted By: Dylan1303
Would there be any benifit to using dot 4 over 3 in my cruze? I assume its oem fluid. Has 90k. I heard dot 4 is less hydro something meaning it absorbs less water over time vs dot 3. That would be a benifit to me. Im also tuned and i guess once a month it gets driven spiritedly. I did a quick stop from 110 mph down to 60mph and it had terrible terrible brake fade and it was mush for a few miles. Pads and rotors are good on front and rear drum has good shoes and adjusted right. Im thinking i over heated my fluid. I know its time for a fluid change and just debating on dot 3 or 4. Also the clutch shares the same resivor as the brake fluid.

Use ATE TYP200 DOT4 fluid and call it a day.


15' Toyota Sienna AWD (Mobil1 0W20 EP+ FRAM Ultra).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: Brake fluid question [Re: Dylan1303] #4759365
05/17/18 12:09 AM
05/17/18 12:09 AM
Joined: Feb 2014
Posts: 2,302
Kansan,1911 45ACP fan
Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,302
Kansan,1911 45ACP fan
Dot 3 lasts longer,Dot4 has better performance but needs changing more often.


15' Civic 189k.0w20 Redline/Archoil9200,Eibach,Tanabe&Tein Suspension/Borla Exhaust/XG7317
Right to work state proud.
Re: Brake fluid question [Re: Marco620] #4759372
05/17/18 12:40 AM
05/17/18 12:40 AM
Joined: Mar 2012
Posts: 5,374
Colorado Springs
edyvw Offline
edyvw  Offline
Joined: Mar 2012
Posts: 5,374
Colorado Springs
Originally Posted By: Marco620
Dot 3 lasts longer,Dot4 has better performance but needs changing more often.

How long? What is longer?
Brake fluid is cheap, very cheap to talk about few months of difference between 1 and 2% of moisture.


15' Toyota Sienna AWD (Mobil1 0W20 EP+ FRAM Ultra).
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)
Re: Brake fluid question [Re: Dylan1303] #4759397
05/17/18 03:27 AM
05/17/18 03:27 AM
Joined: Dec 2013
Posts: 3,989
Manchester, England
Olas Offline
Olas  Offline
Joined: Dec 2013
Posts: 3,989
Manchester, England


1 stop from 110 to 60 should not have any impact on pedal feel, I'd be tempted to change fluid, discs and pads and get them bedded in properly before trying the 110-60 again.

If you noticed that much fade after one deceleration there's a real risk of something damaged or not functioning correctly in your braking system. At the very least repeat the conditions after new fluid and see if you can replicate the fault.


Cable ties should hold it
Re: Brake fluid question [Re: Dylan1303] #4759423
05/17/18 05:31 AM
05/17/18 05:31 AM
Joined: Jan 2018
Posts: 226
South Carolina (SC)
RyanY Offline
RyanY  Offline
Joined: Jan 2018
Posts: 226
South Carolina (SC)
After 6 years it is definitely time for fluid change...manual probably states every 2 or 3 years. This could explain why your pedal is soft, but maybe not. I have owned cars where the brakes were just softer than others. Either way, I would just use what the manual specs (probably dot 3). Or Valvoline Dot 3/4. Just keep up with fluid/pad/rotor changes and you shouldn't have any problems in the future.


2007 Cadillac CTS 3.6L (Pennzoil Platinum HM 5W-30) >116k

2012 Honda Odyssey EX-L (Pennzoil Platinum 0W-20) >91k
Re: Brake fluid question [Re: Dylan1303] #4759552
05/17/18 08:12 AM
05/17/18 08:12 AM
Joined: Dec 2013
Posts: 2,098
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,098
socal
You will be surprised how a brake fluid replace will help. Do it, its cheap. I would use dot 3


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Brake fluid question [Re: Dylan1303] #4759555
05/17/18 08:14 AM
05/17/18 08:14 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
Brake fluid is good for two years, especially if you drive spirited. You boiled your fluid, lucky you did not loose all your brakes.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Brake fluid question [Re: Marco620] #4759561
05/17/18 08:17 AM
05/17/18 08:17 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
Originally Posted By: Marco620
Dot 3 lasts longer,Dot4 has better performance but needs changing more often.


That's not true.

One of the main benefits of DOT4 is that it has a higher wet boiling point.



Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Brake fluid question [Re: Dylan1303] #4759756
05/17/18 11:12 AM
05/17/18 11:12 AM
Joined: Aug 2017
Posts: 149
Displaced Texan in Mexico City
Gimpy1 Offline
Gimpy1  Offline
Joined: Aug 2017
Posts: 149
Displaced Texan in Mexico City
USE Castrol SRF. The per litre price will give you a heart attack.

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