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#4759259 - 05/16/18 09:35 PM Brake fluid question
Dylan1303 Offline


Registered: 10/14/15
Posts: 232
Loc: 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 22lbs
13 equinox 2.4 awd pp 5w30

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#4759268 - 05/16/18 09:42 PM Re: Brake fluid question [Re: Dylan1303]
Garak Offline


Registered: 12/05/09
Posts: 24987
Loc: 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

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#4759299 - 05/16/18 10:15 PM Re: Brake fluid question [Re: Dylan1303]
dailydriver Offline


Registered: 03/14/06
Posts: 9176
Loc: 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)?

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#4759324 - 05/16/18 10:50 PM Re: Brake fluid question [Re: Dylan1303]
Dylan1303 Offline


Registered: 10/14/15
Posts: 232
Loc: 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 22lbs
13 equinox 2.4 awd pp 5w30

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#4759326 - 05/16/18 10:51 PM Re: Brake fluid question [Re: Dylan1303]
Ducked Offline


Registered: 10/25/12
Posts: 4471
Loc: 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.


Edited by Ducked (05/16/18 10:53 PM)

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#4759346 - 05/16/18 11:22 PM Re: Brake fluid question [Re: Dylan1303]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6543
Loc: 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

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#4759355 - 05/16/18 11:39 PM Re: Brake fluid question [Re: Dylan1303]
edyvw Offline


Registered: 03/08/12
Posts: 5110
Loc: 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.
_________________________
13' BMW X5 35d (Valvoline 5W40 MST+OEM filter)
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)

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#4759365 - 05/17/18 12:09 AM Re: Brake fluid question [Re: Dylan1303]
Marco620 Offline


Registered: 02/25/14
Posts: 2263
Loc: Kansan,1911 45ACP fan
Dot 3 lasts longer,Dot4 has better performance but needs changing more often.
_________________________
2015 Civic 175k mi.0w20 Redline/Archoil9100,HPS SRI,Yokohama/Borla Exhaust/Tein Suspension/Fu7317/Redline Si-1
Go Nashville Predators!

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#4759372 - 05/17/18 12:40 AM Re: Brake fluid question [Re: Marco620]
edyvw Offline


Registered: 03/08/12
Posts: 5110
Loc: 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.
_________________________
13' BMW X5 35d (Valvoline 5W40 MST+OEM filter)
11' VW Tiguan 2.0T (Castrol 0W40+MANN filter)

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#4759397 - 05/17/18 03:27 AM Re: Brake fluid question [Re: Dylan1303]
Olas Offline


Registered: 12/11/13
Posts: 3977
Loc: 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

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#4759423 - 05/17/18 05:31 AM Re: Brake fluid question [Re: Dylan1303]
RyanY Offline


Registered: 01/25/18
Posts: 118
Loc: 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 (Valvoline Synthetic Maxlife 0W-20) >87k

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#4759552 - 05/17/18 08:12 AM Re: Brake fluid question [Re: Dylan1303]
barkingspider Offline


Registered: 12/22/13
Posts: 2077
Loc: socal
You will be surprised how a brake fluid replace will help. Do it, itís cheap. I would use dot 3
_________________________
06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)

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#4759555 - 05/17/18 08:14 AM Re: Brake fluid question [Re: Dylan1303]
mightymousetech Offline


Registered: 04/03/17
Posts: 1480
Loc: 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

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#4759561 - 05/17/18 08:17 AM Re: Brake fluid question [Re: Marco620]
mightymousetech Offline


Registered: 04/03/17
Posts: 1480
Loc: 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

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#4759756 - 05/17/18 11:12 AM Re: Brake fluid question [Re: Dylan1303]
Gimpy1 Offline


Registered: 08/24/17
Posts: 135
Loc: Displaced Texan in Mexico City
USE Castrol SRF. The per litre price will give you a heart attack.

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