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Brake fluid change

11K views 32 replies 16 participants last post by  AF8  
#1 ·
I was thinking of change my 2019 camrys fluid just because I know for a fact the fluids I use are better than the factory, quick question, can I change the brake fluid with DOT4 or only DOT3? Anybody know?


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#23 ·
1/ Suction out the reservoir using a CLEAN tube and placing the screen some where clean.

2 /Add "fresh " fluid to the reservoir and bleed:R/R, L/R, R/F and finally L/F. Bleed enough thru each caliber to assure the new fluid has made it all the way. Do notrun out of fluid in the reservoir in the process!

3/ Tips: Remove the bleeder and apply anti- seize to the threads to prevent corroding and thread seizure. A snug fitting clear tube fitted to the bleed screw with the other end immersed in brake fluid is a great help in bleeding. Brake fluid should be completely replaced every two years to prevent calliper seizure and water build-up that lowers the boiling point of the fluid. It goes better w/ 2 people. Have fun!
 
#21 ·
DOT 4 fluids are supposed to be compatible with DOT 3 fluids. That said, they're made of a different blend of components, and I'm uncertain how much testing is done to validate compatibility.


DOT 4 is a higher-viscosity (thicker) fluid than DOT 3 in general. This may alter pedal feel for you very slightly. It _may_ have some sort of impact on ABS pump cycle time, but I'm unsure about that.


Was it not Toyota which experienced brake system failures in certain models several years ago when people used non-Toyota fluid? That _may_ have been Honda, but I think it was Toyota. I don't recall whether Toyota changed the materials they use in their brake systems in response to this, or if they carried on and (like Honda) urge their customers to use Toyota fluid, or what.



The specs for brake fluids are wide open insofar as they specify very little. I can tell you that the last time I used a 'european' brake fluid in an American-market, Japanese-label vehicle, the fluid turned green very quickly, indicating potential corrosive attack of copper-containing brake system parts.


Do as you like. On paper (the paper that specifies extremely little), you _should_ be able to use DOT 4 in place of DOT 3. Should. If you do, change it more frequently than what the manual calls for if using DOT 3, since DOT 4 will hold less water and thus can't deal with water contamination as well as DOT 3.
 
#22 ·
Ahhh, don’t want anything that corrosive in my car, seems like I’ll be sticking with the oem DOT3 fluids and just trust the manual. I think the brake failure may have actually been toyota years ago!


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#32 ·
If you have no useful information be gone.. and looking to gain.... why don’t you read the opening post and figure it out yourself [emoji2359]


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#29 ·
My Toyotas have had no issues with DOT 3, DOT 4, Super DOT 4, DOT 4LV, and DOT5.1 fluids. You can use whatever you want from a new sealed container for top offs and for bleeding.

DOT 3 is cheap and available pretty much ANYWHERE. Rumor is that Honda/Toyota/Nissan/Hyundai allegedly use a seal conditioner with their brake fluids that increases the lifespan of wheel cylinder, master cylinder, brake caliper 'seals gaskets...'. Supposedly, the aftermarket fluids don't necessarily use it and these conditioners go against normal SAE/DOT rubber compatibility neutrality standards, and why some Asian automakers had to replace/recall/remedy various issues with master cylinder leakage while using the blame game... it was caused by aftermarket fluid. It wasn't and issues were caused by automakers using cheap seals and a brake fluid seal conditioner for longevity.

I highly recommend 'automaker' branded brake fluid. Leftover bottles of brake fluid should be recycled. Even the tamper resistance air-tight brake fluid bottle seal is a SAE/DOT spec. Use only new unopened bottles for all your top offs, siphon refills, and brake bleeding.

Since automakers cut corners every chance possible, its easy to avoid the 'blame game' and just use a dealer sourced brake fluid. My neighbor works at a Honda dealership and every Ford/GM/Mopar/Toyota/Nissan/Mazda/Honda... on the street has been bleed with 'discounted' Honda brake fluid. Dealer cost employee case pricing is very affordable.

I have no issues with ANY traditional DOT store brand or aftermarket fluid. I just get the Honda fluid cheaper and understand some of the games that automakers play with cost cutting.

The only time you need higher boiling points is if you track/race your car or your commute includes trips down the fast side of Mt Everest, when downhill braking is important. Most Toyotas now have more than adequate braking and should do well with and need no more than DOT3. Save your money on fluid by bleeding more often to keep moisture levels as low as possible and rust inhibitors as fresh as possible. Bleed every 2-3 years or every 25k-35k miles, and at every brake repair.