 Brake fluid, What to use? |
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| EJP914 |
 Mar 3 2021, 01:05 PM
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#1
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Member  Group: Members Posts: 260 Joined: 14-June 03 From: Monroeville, PA Member No.: 821  |
I am in the process of replacing all of my brake calipers and hoses on '73 1.7 that has been sitting for about 15 years.. From notes that I got from the previous owner says he changed to silicone brake fluid (many years ago). Fluid in the reservoir is kind of purple in color so I'm guessing its DOT 5 type.
Before I start pulling this fluid thru the new calipers, any reasons why I shouldn't just stay with DOT 5 fluid? Any downside to using DOT 5 in these cars? Thanks for the comments EJP914 |
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| GregAmy |
Mar 3 2021, 07:04 PM
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#2
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States 
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The significant rating difference between DOT 3 and DOT 4 is the "wet" boiling point. DOT 4 is higher.
"Wet" boiling point is the temperature at which the fluid will boil when it has absorbed all the moisture it can. Which means every Hyundai, Civic, Camry out there today. DOT 4 actually absorbs moisture faster, so should be changed more often. If you flush it regularly* DOT 4 is perfectly fine. If you're street driving, never tracking, and you'l let it ride for 5+ years, DOT 3 may be a better option. I race on DOT 4 and change it a couple times a year. My street cars typically have DOT 3. *I think "every year" is a bit anal...but at least I know I'm safe around you. (IMG:style_emoticons/default/wink.gif) My wife is my pedal pusher too. I just noticed that Harbor Freight as a vacuum bleed system that runs on shop air, I'm tempted to give it a try. |
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| Root_Werks |
Mar 4 2021, 10:47 AM
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#3
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Village Idiot Group: Members Posts: 8,331 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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QUOTE(GregAmy @ Mar 3 2021, 05:04 PM)  The significant rating difference between DOT 3 and DOT 4 is the "wet" boiling point. DOT 4 is higher. "Wet" boiling point is the temperature at which the fluid will boil when it has absorbed all the moisture it can. Which means every Hyundai, Civic, Camry out there today. DOT 4 actually absorbs moisture faster, so should be changed more often. If you flush it regularly* DOT 4 is perfectly fine. If you're street driving, never tracking, and you'l let it ride for 5+ years, DOT 3 may be a better option. I race on DOT 4 and change it a couple times a year. My street cars typically have DOT 3. *I think "every year" is a bit anal...but at least I know I'm safe around you. (IMG:style_emoticons/default/wink.gif) My wife is my pedal pusher too. I just noticed that Harbor Freight as a vacuum bleed system that runs on shop air, I'm tempted to give it a try. Probably my lack of skill, but I always make such a mess when I use a pressure bleeder. Wound up getting rid of mine years ago. But again, probably me, not the pressure bleeders fault. |
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| GregAmy |
Mar 4 2021, 11:15 AM
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#4
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(Root_Werks @ Mar 4 2021, 11:47 AM) Probably my lack of skill, but I always make such a mess when I use a pressure bleeder. Wound up getting rid of mine years ago. But again, probably me, not the pressure bleeders fault. Me too, I never liked them. But this one is a vacuum bleeder, using shop air (I have a compressor). Recommended to me by a good buddy. At $90 it's worth a shot. https://www.harborfreight.com/merchandising...-kit-57057.html |
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| GregAmy |
Mar 4 2021, 06:54 PM
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#5
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Advanced Member Group: Members Posts: 2,311 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(GregAmy @ Mar 4 2021, 12:15 PM) Me too, I never liked them. But this one is a vacuum bleeder, using shop air (I have a compressor). Recommended to me by a good buddy. At $90 it's worth a shot. Got one, tried it tonight. I made a mess. Granted, I didn't use it completely correctly, so I'll give it another shot later. But it does not like the very small nipples on the Wilwood Dynalite calipers. More in tune with larger stock ones. |
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Posts in this topic
EJP914 Brake fluid Mar 3 2021, 01:05 PM
Mark Henry DOT5 is so easy to contaminate and it likely is af... Mar 3 2021, 01:30 PM
worn
DOT5 is so easy to contaminate and it likely is a... Mar 4 2021, 12:30 PM brant dot 4 and dot 5 do not mix
do not use dot 5 Mar 3 2021, 02:25 PM mgp4591
dot 4 and dot 5 do not mix
do not use dot 5
Wha... Mar 3 2021, 03:13 PM brant
dot 4 and dot 5 do not mix
do not use dot 5
Wh... Mar 3 2021, 03:23 PM ClayPerrine
Fluid in the reservoir is kind of purple in color... Mar 3 2021, 02:38 PM GregAmy
It is probably ATE Super Blue. The Federal Govern... Mar 3 2021, 05:45 PM EJP914 Just so I understand correctly. Put in DOT 4 and b... Mar 3 2021, 03:52 PM brant I've always heard that dot 4 and dot 5 do not ... Mar 3 2021, 04:02 PM Mark Henry https://www.jalopyjournal.com/forum/threads...-bra... Mar 3 2021, 05:20 PM Root_Werks If it's a street car, what's wrong with DO... Mar 3 2021, 06:21 PM CptTripps Genuinely confused by this stuff then...which is i... Mar 4 2021, 05:35 AM 73-914 It's DOT 5.1 (Backwards compatible with 4 ... Mar 4 2021, 06:18 AM Aerostatwv
It's DOT 5.1 (Backwards compatible with 4 ... Mar 4 2021, 10:34 AM |
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