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#4558714 - 10/29/17 07:52 PM DOT 3 & 4 brake fluid
WyrTwister Offline


Registered: 01/13/13
Posts: 1487
Loc: Texas
Is it OK to use DOT 3 & 4 fluid in the master cylinder reservoir of a 1991 Chevy Caprice ? Will it " mix " OK with the " older " specifications of brake fluid ?

Thanks ,
Wyr
God bless
_________________________
Wyr
God bless

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#4558730 - 10/29/17 08:06 PM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
demarpaint Offline


Registered: 07/03/05
Posts: 29736
Loc: NY
If DOT 3, DOT 4, or DOT 5.1 was in there before it will mix.
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#4558762 - 10/29/17 08:39 PM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
WyrTwister Offline


Registered: 01/13/13
Posts: 1487
Loc: Texas
What DOT spec brake fluid did Chevy use in 1991 ?

Thanks , :-)
_________________________
Wyr
God bless

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#4558786 - 10/29/17 08:55 PM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
mechjames Offline


Registered: 01/16/08
Posts: 516
Loc: Richmond, BC, Canada
dot 3 was what was used
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#4558841 - 10/29/17 09:54 PM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
BHopkins Offline


Registered: 11/03/13
Posts: 1095
Loc: Utah
DOT 3 and DOT 4 are 100% compatible. You can use DOT 3 or DOT 4 anywhere DOT 3 is specified. However, DOT 3 should not be used where DOT 4 is called for.

DOT 4 meets higher dry and wet boiling points than DOT 3. Although your '91 Caprice may never benefit from the benefits, you may feel totally safe in using DOT 4 in it.
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2013 Subaru Outback 2.5i - Royal Purple 0W-20 & NAPA Gold filter
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#4558843 - 10/29/17 09:57 PM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
Ducked Offline


Registered: 10/25/12
Posts: 4325
Loc: Taiwan
Originally Posted By: WyrTwister
What DOT spec brake fluid did Chevy use in 1991 ?

Thanks , :-)


Sounds like you're saying its on the original fill. If thats the case, you shouldnt be wondering whether it'll mix with new stuff, you should be flushing and changing it completely.

In fact you should probably just change it anyway.

Personally I'd use DOT3 cos here its about 2/3 the price and you'll use quite a bit to flush and change the whole system.


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#4558871 - 10/29/17 11:02 PM Re: DOT 3 & 4 brake fluid [Re: BHopkins]
Wolf359 Offline


Registered: 04/27/12
Posts: 4739
Loc: MA
Originally Posted By: BHopkins
DOT 3 and DOT 4 are 100% compatible. You can use DOT 3 or DOT 4 anywhere DOT 3 is specified. However, DOT 3 should not be used where DOT 4 is called for.

DOT 4 meets higher dry and wet boiling points than DOT 3. Although your '91 Caprice may never benefit from the benefits, you may feel totally safe in using DOT 4 in it.


The only issue with Dot 4 is that it tends to be more hydroscopic than Dot 3 so you need to flush the fluid more often. Mine uses dot 4 and the manufacturer recommends fluid flushes every 2 years. Lots of cars from the 90's never recommended an interval although it was always a good idea as water will eventually rust out the the lines and other parts inside your braking system.

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#4558896 - 10/30/17 12:41 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
WyrTwister Offline


Registered: 01/13/13
Posts: 1487
Loc: Texas
Well , after reading on this forum , I have been using the turkey baster , from time to time . Bit there is probably some of the original fill .

Just got back from giving our Daughter a lift home , from work . ABS lite did not come on this time ! :-)

Praise the Lord ! :-)

Wifey is out of town visiting oldest Grand Daughter . Will try to flush the system when She gets back , & can help . Hope the little Bleed nipples are not rusted solid ...........


Thanks , all , :-)
Wyr
God bless
_________________________
Wyr
God bless

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#4559020 - 10/30/17 07:38 AM Re: DOT 3 & 4 brake fluid [Re: Wolf359]
JLawrence08648 Offline


Registered: 01/20/17
Posts: 231
Loc: NJ
Hygroscopic, not hydroscopic.

Originally Posted By: Wolf359
[quote=BHopkins]

The only issue with Dot 4 is that it tends to be more hydroscopic than Dot 3 so you need to flush the fluid more often. Lots of cars from the 90's never recommended an interval although it was always a good idea as water will eventually rust out the the lines and other parts inside your braking system.

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#4559052 - 10/30/17 08:18 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
Ducked Offline


Registered: 10/25/12
Posts: 4325
Loc: Taiwan
Originally Posted By: WyrTwister
Well , after reading on this forum , I have been using the turkey baster , from time to time .


Presumably not reading (or at least not believing) the bit where it says the "turkey baster method" is pretty useless. I doubt its completely useless, since it may protect your master cylinder a bit, but its likely to leave some wet fluid in the extremities where it can cause corrosion and interfere with braking.

Originally Posted By: WyrTwister


Wifey is out of town visiting oldest Grand Daughter . Will try to flush the system when She gets back , & can help . Hope the little Bleed nipples are not rusted solid ...........


You don't need help (unless your wife is good at freeing up rusted bleed nipples, which is a pain).

Wives may be different (no experience) but having tried girlfriends in the brake bleeding role I'd say it isn't worth the collateral hassle.

There are several ways you can bleed brakes solo. Easiest is probably a simple gravity bleed, though I personally favor using an enema syringe for more pressure and control.


Edited by Ducked (10/30/17 08:23 AM)

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#4559075 - 10/30/17 08:51 AM Re: DOT 3 & 4 brake fluid [Re: Ducked]
WyrTwister Offline


Registered: 01/13/13
Posts: 1487
Loc: Texas
Originally Posted By: Ducked
Originally Posted By: WyrTwister
Well , after reading on this forum , I have been using the turkey baster , from time to time .


Presumably not reading (or at least not believing) the bit where it says the "turkey baster method" is pretty useless. I doubt its completely useless, since it may protect your master cylinder a bit, but its likely to leave some wet fluid in the extremities where it can cause corrosion and interfere with braking.

Originally Posted By: WyrTwister


Seems to be doing a little good , since the ABS lite is coming on less often .

I have done brake work many times ( starting back in the late 1960's ) & Wifey has helped bleed the brakes many times ( since the 1980's ) . Think we will be good in that area .



Wifey is out of town visiting oldest Grand Daughter . Will try to flush the system when She gets back , & can help . Hope the little Bleed nipples are not rusted solid ...........


You don't need help (unless your wife is good at freeing up rusted bleed nipples, which is a pain).

Wives may be different (no experience) but having tried girlfriends in the brake bleeding role I'd say it isn't worth the collateral hassle.

There are several ways you can bleed brakes solo. Easiest is probably a simple gravity bleed, though I personally favor using an enema syringe for more pressure and control.


Have heard of gravity bleeding of the brakes . Was / am some what cautious about that .

Have this cheap plastic transfer pump . Wonder how it would work ?

https://www.harborfreight.com/multi-use-transfer-pump-63144.html

Thanks , :-)
_________________________
Wyr
God bless

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#4559095 - 10/30/17 09:12 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
WyrTwister Offline


Registered: 01/13/13
Posts: 1487
Loc: Texas
https://shop.advanceautoparts.com/p/valvoline-dot-3-and-4-synthetic-brake-fluid-32-oz.-601458/7080002-P?navigationPath=L1*14924%7CL2*15037%7CL3*16113

I used some of this , this weekend . Could someone please explain DOT 3 & 4 . I would think it would be either / or ?

Someone said DOT 4 was more hygroscopic . Not sure if I want that . Would that apply to this Valvoline product ?

Thanks , :-)
_________________________
Wyr
God bless

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#4559133 - 10/30/17 09:59 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
Originally Posted By: WyrTwister
Well , after reading on this forum , I have been using the turkey baster , from time to time . Bit there is probably some of the original fill .

Just got back from giving our Daughter a lift home , from work . ABS lite did not come on this time ! :-)

Praise the Lord ! :-)

Wifey is out of town visiting oldest Grand Daughter . Will try to flush the system when She gets back , & can help . Hope the little Bleed nipples are not rusted solid ...........


Thanks , all , :-)
Wyr
God bless
The
turkey baser is a 100% waste of time.
_________________________
"Don't let your preconceived notions get in the way of facts."Geoff Metcalf"

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#4559148 - 10/30/17 10:09 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
skyactiv Offline


Registered: 03/02/13
Posts: 4389
Loc: The Midwest
DOT 4 is cross compatible with DOT 3 brake fluid. Some brake fluids might be labeled saying both DOT 3 and DOT 4 just like some oils have been labeled API SM, API SN. I'd have no problem using
a store brand brake fluid such as Supertech DOT 3 in that vehicle. Cheap at Wal-Mart at $4.XX a quart. That is what I used when I maintained my elderly neighbors Chevy Colorado before I moved.
I use a turkey baster and a home made one man brake bleeder. You don't need to gravity bleed and get all crazy.

_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4559153 - 10/30/17 10:11 AM Re: DOT 3 & 4 brake fluid [Re: WyrTwister]
skyactiv Offline


Registered: 03/02/13
Posts: 4389
Loc: The Midwest
Suck out the old fluid in the master cylinder resivour with the turkey baster and add fresh fluid before flushing.
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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