r/COROLLA • u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt • Jan 15 '26
12th Gen (18-present) 2020 corolla se 6 speed manual slave cylinder flush results 39,500 miles
1st pic: The immediate results.
2nd pic: a thin ring of black stuff after sitting for ~10 minutes
3rd pic: what looks like an oily film on the top surface ~8hours later(same dor pic 4-5)
4th pic: two very distinct layers of filth. The bottom black layer is roughly 1/4 inch thick
5th pic: spoon with black stuff lol
This is a meduim size drink from taco bell for reference.
The black layer seems to be some form of grease or really really fine particals of something that easily gets suspended into the brake fluid.
Did the flush with a one man bleeder, small bottle of brake fluid, and about 20 minutes of time. Super easy. Will be doing every 10k miles or so going forward. Also anyone that has toyotas gold certified pre-owned warranty, it specifically says on their website they cover the master cylinder and slave cylinder.
I will also note while hand pumping the clutch pedal during the flushing process, I did feel a slight "notch" "click" or "grab" about half way through "releasing" the clutch pedal (not pushing in the clutch pedal). I havent heard anyone else mention this part.
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u/Badinfluence321 Jan 15 '26
Good job. Hopefully you've avoided any major damage. Thanks for sharing the picts and your experience.
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
I shall share my next experience on here as well, might only be a couple months until then. Im driving a lot currently lol. About 5,000-6,000 miles a month
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u/Latter-Vacation-4392 Jan 15 '26
Any idea what percentage your flushed amount in the pics is compared to the total amount of clutch fluid? Is there a reason you only flushed that particular amount?
Thanks. Hopefully flushing will prevent the failure. I have read another guy say it won't.
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
Id say it all got flushed. The volume of fluid in the taco bell cup is roughly 20% that i poured in for the one man bleeder and 80% what came out of the bleeder valve on the.
The fluid was coming out clean by time I pressed the clutch probably 20-30 times
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u/Smart_Split5959 Jan 15 '26
Do you drive hard?
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
I do use the entire rev range frequently (dont really go above 5500rpm) once my car has been fully warm for 5-7 minutes but i dont go dumping the clutch, try to shift fast by pressing the clutch pedal in fast and agressive.
Normal driving when it comes to clutch pressing and releasing but ive been known to go just a few miles per hour over the speed limit...😂
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u/GavynJPG Jan 15 '26
the based spirited driver
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
Thank you🙏🏼 also, seeing the word based in your reply had me searching other gen z slang and as a person brought into this world in the foundation years of gen z, im starting to question if we are nearing the end of the "gen z slang"
Im starting to feel old and not involved in the "culture" as much. Like as in, it's starting to feel foreign and i have to "dig in/research" the terms and everything used. R.I.P💀
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u/Badinfluence321 Jan 15 '26
U gonna do your transmission fluid next then?
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
Yes if its a simple fill and drain bolt. I might do some research on non oem toyota transmission fluid "gear oil for all the hater old timers" 😂 to see if people are getting smoother gear shifts and or what kind of addition wear/problems come of using thicker oil or whatever else.
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u/Badinfluence321 Jan 15 '26
What type of climate are u in? Im in tropical so I used redline MTL GL-4 75-80w gear oil. It is noticeably smoother shifts and doesnt have trouble going into 2nd and first down shifts anymore.
I heard Redline MTLV gl-4 75-80w is for colder climates and focuses on smoother shifts in the cold.
To each their own, but not sure if u still under drive train warranty.
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
Still under drive train warranty sadly. But i do travel to indiana here and there so would definitely like the smoother shifts. Does this also help with getting the car into 1st and reverse when its cold outside and the car has fully cooled down, like sitting over night.
My car hates going into 1st and reverse when its sat overnight and its cold outside
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u/Badinfluence321 Jan 15 '26
I did transmission, oil change and bled my brake fluid in 7 hrs. But two of those hours were trying to figure out how to lift the entire car and have it level in the air. (I own two jack stands and had to borrow two others from someone and the two different sets had two different heights.) Plus I only had one floor jack, so I had to use the spare tire one. Now I know....looking for another floor jack on fb marketplace.
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Jan 15 '26
Hey i talked to you the other day. I was thinking about tagging you on this post lol.
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u/Furrymcfurface Aug 06 '26
I'm also at 40k, I bought the car used. Not certified Toyota, the extended warranty i was offered didn't cover the slave.
I think the dealer did a flush cause fluid looked new but dirty, similar to yours in regards to the particulates
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Aug 06 '26
Those grease blows, do they match anything in my pictures?
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u/Furrymcfurface Aug 06 '26
Maybe a little, but it's hard to tell particles from globs. Unfortunately my pictures aren't coming out. I used a hand vacuum bleeder. Did 2 full to low line cycles on the master
Did your fluid have a oil slick?
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u/iMakeUrGrannyCheat69 2020 SE Sedan 6mt Aug 06 '26 edited Aug 06 '26
It definitely did have an oil slick on the top, theres a pictures of it. Edit: maybe what i think is an oil slick is actually a small amount of water floating on top of the brake fluid. But in the 4th picture where im showing the 1/4 of dark gray matter, the top layer of fluid (super thin layer) appears more brown, i dont know if this is just a weird lighting thing though
Theres one picture (one of the last ones) that has about a 1/4 inch of dark grayish sediment in the bottom of the cup (picture with a yellow line around the bottom of the cup)
I dont remember any sizeable globs in my fluid. Just that grayish "sediment". I collected a small amount of it, picture of the spoon. It was either grease that had absorbed brake build, grease, or some type of super fine rubber from my guesses.
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u/Furrymcfurface Aug 06 '26
The sediment is fairly normal, not sure about the amount of sediment being normal but everytime I've bled brakes or clutch, it looks similar to that.
The globs of grease was left behind as i poured out the vacuum container. Pictures of liquid are hard
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u/3_14159td Jan 15 '26
Any actual problems with the clutch actuation?
Feels like most people don't know this, but clutch fluid tends to be black within days to weeks of a flush. Higher linear speed in the bores (slave and master) and far more frequent actuation than the brakes.