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DOT 3 & 4 brake fluid #4558714
10/29/17 07:52 PM
10/29/17 07:52 PM
Joined: Jan 2013
Posts: 1,833
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 1,833
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
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558730
10/29/17 08:06 PM
10/29/17 08:06 PM
Joined: Jul 2005
Posts: 30,415
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,415
NY
If DOT 3, DOT 4, or DOT 5.1 was in there before it will mix.


God Bless Our Troops

Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558762
10/29/17 08:39 PM
10/29/17 08:39 PM
Joined: Jan 2013
Posts: 1,833
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 1,833
Texas
What DOT spec brake fluid did Chevy use in 1991 ?

Thanks , :-)


Wyr
God bless
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558786
10/29/17 08:55 PM
10/29/17 08:55 PM
Joined: Jan 2008
Posts: 519
Richmond, BC, Canada
mechjames Offline
mechjames  Offline
Joined: Jan 2008
Posts: 519
Richmond, BC, Canada
dot 3 was what was used


86 Mustang 5.0L 170km - Amsoil XL 5w30 / Baldwin B2-HPG
14 Ram 1500 5.7 - Amsoil XL 5w20 / Baldwin B7443
98 Jeep ZJ 5.9 - Amsoil OE 10w30 / Baldwin B34
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558841
10/29/17 09:54 PM
10/29/17 09:54 PM
Joined: Nov 2013
Posts: 1,136
UT
BHopkins Offline
BHopkins  Offline
Joined: Nov 2013
Posts: 1,136
UT
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.


2013 Subaru Outback 2.5i - Idemitsu 0W-20 & Mobil 1 filter
2003 Oldsmobile Alero 3.4 - M1 5W-30 & NAPA Gold filter
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558843
10/29/17 09:57 PM
10/29/17 09:57 PM
Joined: Oct 2012
Posts: 4,590
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,590
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.


Re: DOT 3 & 4 brake fluid [Re: BHopkins] #4558871
10/29/17 11:02 PM
10/29/17 11:02 PM
Joined: Apr 2012
Posts: 5,138
MA
Wolf359 Online content
Wolf359  Online Content
Joined: Apr 2012
Posts: 5,138
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.

Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4558896
10/30/17 12:41 AM
10/30/17 12:41 AM
Joined: Jan 2013
Posts: 1,833
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 1,833
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
Re: DOT 3 & 4 brake fluid [Re: Wolf359] #4559020
10/30/17 07:38 AM
10/30/17 07:38 AM
Joined: Jan 2017
Posts: 311
NJ
JLawrence08648 Offline
JLawrence08648  Offline
Joined: Jan 2017
Posts: 311
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.

Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4559052
10/30/17 08:18 AM
10/30/17 08:18 AM
Joined: Oct 2012
Posts: 4,590
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,590
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.

Last edited by Ducked; 10/30/17 08:23 AM.
Re: DOT 3 & 4 brake fluid [Re: Ducked] #4559075
10/30/17 08:51 AM
10/30/17 08:51 AM
Joined: Jan 2013
Posts: 1,833
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 1,833
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
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4559095
10/30/17 09:12 AM
10/30/17 09:12 AM
Joined: Jan 2013
Posts: 1,833
Texas
WyrTwister Offline OP
WyrTwister  Offline OP
Joined: Jan 2013
Posts: 1,833
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
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4559133
10/30/17 09:59 AM
10/30/17 09:59 AM
Joined: Oct 2014
Posts: 11,816
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,816
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
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4559148
10/30/17 10:09 AM
10/30/17 10:09 AM
Joined: Mar 2013
Posts: 4,754
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,754
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
Re: DOT 3 & 4 brake fluid [Re: WyrTwister] #4559153
10/30/17 10:11 AM
10/30/17 10:11 AM
Joined: Mar 2013
Posts: 4,754
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,754
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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