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


Registered: 10/14/15
Posts: 145
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 chevy cruze 1.4t 6spd penz euro 0w40
09 ford fusion 2.3l auto royal purple 5w20

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


Registered: 12/05/09
Posts: 24372
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: 9152
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: 145
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 chevy cruze 1.4t 6spd penz euro 0w40
09 ford fusion 2.3l auto royal purple 5w20

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


Registered: 10/25/12
Posts: 4225
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 Offline


Registered: 03/20/08
Posts: 5990
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: 4941
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 (Mobil1 5W30 ESP+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: 2082
Loc: Deplorable in Kansas, HK fan b...
Dot 3 lasts longer,Dot4 has better performance but needs changing more often.
_________________________
2015 Civic (R18Z1) 157k mi.0w20 Redline/Archoil,HPS SRI,87e0/Moog links Borla Exhaust/Vibrant Resonator/Tein Suspension
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#4759372 - 05/17/18 12:40 AM Re: Brake fluid question [Re: Marco620]
edyvw Offline


Registered: 03/08/12
Posts: 4941
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 (Mobil1 5W30 ESP+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: 3923
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.
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#4759423 - 05/17/18 05:31 AM Re: Brake fluid question [Re: Dylan1303]
RyanY Offline


Registered: 01/25/18
Posts: 70
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 (PennPlatHM 5W-30+PureOne; Valvoline DexVI+Lubegard; RP MaxGear Diff)

2012 Honda Odyssey EX-L (PennPlat 0W-20+PureOne; PennPlat LV)

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


Registered: 12/22/13
Posts: 2010
Loc: socal
You will be surprised how a brake fluid replace will help. Do it, itís cheap. I would use dot 3
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06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
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#4759555 - 05/17/18 08:14 AM Re: Brake fluid question [Re: Dylan1303]
mightymousetech Online   happy


Registered: 04/03/17
Posts: 1397
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.
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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 Online   happy


Registered: 04/03/17
Posts: 1397
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.

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Mighty Mouse Tech
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: 76
Loc: Displaced Texan in Mexico City
USE Castrol SRF. The per litre price will give you a heart attack.

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