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#801656 - 06/11/10 09:48 PM Brake fluid in transmission  
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monsterjam5000 Offline
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Flint Michigan
I checked my trans fluid and was a quart low so I went to add some and forgot I used the bottle for brake fluid



So I put about 2 oz of brake fluid in my trans will this hurt anything not sure what to do it's all brand new synthetic trans fluid like 10 miles tops on the fluid

#801657 - 06/11/10 10:04 PM Re: Brake fluid in transmission [Re: monsterjam5000]  
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MY FYN 79 Offline
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Brake fluid is nasty stuff when it isnt where its supposed to be. My suggestion is to get it out of your transmission ASAP.

Brake fluid swells things, takes off paint, and absorbs water when it isnt in a sealed system. I've heard of people putting brake fluid in transmissions when they are slipping to get a few more miles out of them.


~Jeremy~
79 Monte - Sold 5-11-13
Welcome Natalee Mae 3-16-12
#801672 - 06/11/10 11:10 PM Re: Brake fluid in transmission [Re: MY FYN 79]  
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monsterjam5000 Offline
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Flint Michigan
but i only put it about 2 oz max would that hurt anything and how should i go about getting it all out

#801681 - 06/11/10 11:56 PM Re: Brake fluid in transmission [Re: monsterjam5000]  
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Richie Cat Offline
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From what I've found so far by Googling what you did there should be no problems. Look at what both the brakes and transmissions do. They both are under pressure and heat. With that amount of brake fluid vs. trans fluid what is the ratio? 2oz in a system that holds 10 qts. I myself see nothing to worry about.


83 SC, 355 w/TPI
#801685 - 06/12/10 12:16 AM Re: Brake fluid in transmission [Re: Richie Cat]  
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85t5mcss Offline
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The fact that they r both hydraulic systems under pressure has nothing to do with it. The rubber used in the seals and the friction materials on the clutches are what actually would matter. After all, a little oil will contaminate a lot of water.

While the ratio is small I would feel uncomfortable leaving it. Since it hasn't been run, I would drop pan and flush the fill tube. Even though it is Synthetic fluid. I'd rather spend another $50 in fluid than destroy a transmission. OR, I could be paranoid and it won't harm anything at all and will have no ill effects on the transmission. I don't know either way so let the guys with experience answer this.


1985 Monte Carlo SS, T-Tops, 355cid w/ AFR 195s 409HP/429TQ, C5 Front Brakes, T5 5 Speed, QA1 Adjustable shocks/springs Front and Rear blah, blah, blah..........
Silly "Ricers", useless wings are for penguins!
#801694 - 06/12/10 12:55 AM Re: Brake fluid in transmission [Re: 85t5mcss]  
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Houston
like Jeremy said, brake fluid softens and swells the seals.
its why it sometimes works to patch a slipping trans.
brake fluid in a fresh trans will do the same thing to the seals. with good seals, they may swell enough to bind the pistons in the drums.
i wouldn't take the chance, drop the pan, replace the filter and flush the filler tube.
i would probably also spray the exposed areas with brake clean while the filter is off.

#801698 - 06/12/10 01:09 AM Re: Brake fluid in transmission [Re: 85t5mcss]  
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Richie Cat Offline
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Originally Posted By: 85t5mcss
The fact that they r both hydraulic systems under pressure has nothing to do with it. The rubber used in the seals and the friction materials on the clutches are what actually would matter. After all, a little oil will contaminate a lot of water.

While the ratio is small I would feel uncomfortable leaving it. Since it hasn't been run, I would drop pan and flush the fill tube. Even though it is Synthetic fluid. I'd rather spend another $50 in fluid than destroy a transmission. OR, I could be paranoid and it won't harm anything at all and will have no ill effects on the transmission. I don't know either way so let the guys with experience answer this.
Granted,I have to agree with you about the chemical make up of fluids. But I really don't see a differance in a lip seal of a trans. vs. a lip seal of a wheel clyinder. The only differance I see now is contaminating the synthetic fluid with an oil based brake fluid. Unless the brake fluid was synthetic.

Last edited by Richie Cat; 06/12/10 01:10 AM.

83 SC, 355 w/TPI
#801704 - 06/12/10 01:22 AM Re: Brake fluid in transmission [Re: Richie Cat]  
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94ONLYSS Offline
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it will also make tranny not slip so much,old tric before selling car with slipping tranny..

#801764 - 06/12/10 05:12 AM Re: Brake fluid in transmission [Re: Richie Cat]  
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baaboo Offline
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Originally Posted By: Richie Cat
From what I've found so far by Googling what you did there should be no problems. Look at what both the brakes and transmissions do. They both are under pressure and heat. With that amount of brake fluid vs. trans fluid what is the ratio? 2oz in a system that holds 10 qts. I myself see nothing to worry about.


Yep, I agree. Even if you change it now, you'll only get less than an ounce out, since it's mixed, so most will still be in there.


1987 Aerocoupe, 383 Super Ram and 20-gallon custom aluminum tank. Car retired (for now) from open road racing, but I'm not.
#801782 - 06/12/10 08:02 AM Re: Brake fluid in transmission [Re: baaboo]  
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monsterjam5000 Offline
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Flint Michigan
Not sure if the brake fluid is synthetic or not. I would have to say not though

also the car was running while I poured it in and I looked at it and stopped pouring because it looked more clear than red. Just didn't look right but I let the car run while I tried to figuer out what it was. So it got picked up by the pump so the only way to get it put would be flush it all and thats going to be about 200 by tome I buy all synthetic fluids and pay to get the flush

wanted to know if it would hurt anything first I get people telling me it's fine leave it others say drain it out. It's only 2oz tops



Man this sucks just put the new trans in and now this

#801783 - 06/12/10 08:06 AM Re: Brake fluid in transmission [Re: Richie Cat]  
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monsterjam5000 Offline
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[/quote]The only differance I see now is contaminating the synthetic fluid with an oil based brake fluid. Unless the brake fluid was synthetic. [/quote]


What could happen here? Would it be bad?

#801784 - 06/12/10 08:29 AM Re: Brake fluid in transmission [Re: monsterjam5000]  
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Richie Cat Offline
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Take an oil sample of the trans fluid and have it checked. The test lab can tell you the break down of what's (%) in the oil. You could talk to the manufacturer of the trans. oil also and ask them about what you did.


83 SC, 355 w/TPI
#801806 - 06/12/10 01:19 PM Re: Brake fluid in transmission [Re: Richie Cat]  
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MY FYN 79 Offline
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Adrian,

Being honest, it sounds like you're looking for people to justify to you that leaving it in will be OK... rather than taking the steps to correct a mistake that was made.

My concern is for the fibrous friction materials in the transmission. Was it really only 2 oz., or could it have been a little more?

I personally would at least change the fluid. Correcting it now would still be cheaper than damaging the transmission. Another option would be to talk to the builder of the transmission and see what they say. twocents


~Jeremy~
79 Monte - Sold 5-11-13
Welcome Natalee Mae 3-16-12
#801880 - 06/12/10 07:28 PM Re: Brake fluid in transmission [Re: MY FYN 79]  
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monsterjam5000 Offline
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Flint Michigan
it was less than 2oz but just say 2 to be safe, just dont want to spend the money for nothing.


if i have to whats the best way to get it all out for sure?

#802196 - 06/13/10 11:06 PM Re: Brake fluid in transmission [Re: MY FYN 79]  
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monsterjam5000 Offline
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How can I be sure to get it all out of my transmission

#802216 - 06/14/10 12:21 AM Re: Brake fluid in transmission [Re: Richie Cat]  
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mikeo Offline
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St. Cloud Mn.
Originally Posted By: Richie Cat
Originally Posted By: 85t5mcss
The fact that they r both hydraulic systems under pressure has nothing to do with it. The rubber used in the seals and the friction materials on the clutches are what actually would matter. After all, a little oil will contaminate a lot of water.

While the ratio is small I would feel uncomfortable leaving it. Since it hasn't been run, I would drop pan and flush the fill tube. Even though it is Synthetic fluid. I'd rather spend another $50 in fluid than destroy a transmission. OR, I could be paranoid and it won't harm anything at all and will have no ill effects on the transmission. I don't know either way so let the guys with experience answer this.
Granted,I have to agree with you about the chemical make up of fluids. But I really don't see a differance in a lip seal of a trans. vs. a lip seal of a wheel clyinder. The only differance I see now is contaminating the synthetic fluid with an oil based brake fluid. Unless the brake fluid was synthetic.


There is a huge difference in the makeup of the rubber. I have had the guys in my shop put it in power steering and the results were to replace all hoses racks and the pumps. You need to get it flushed out asap.


87 Monte carlo ss 383 200r4 sleeper
#802355 - 06/14/10 01:52 PM Re: Brake fluid in transmission [Re: MY FYN 79]  
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Bri86SS Offline
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Originally Posted By: MY FYN 79
Adrian,

Being honest, it sounds like you're looking for people to justify to you that leaving it in will be OK... rather than taking the steps to correct a mistake that was made.

My concern is for the fibrous friction materials in the transmission. Was it really only 2 oz., or could it have been a little more?

I personally would at least change the fluid. Correcting it now would still be cheaper than damaging the transmission. Another option would be to talk to the builder of the transmission and see what they say. twocents



Follow this advice. He's not steering you in the wrong direction. It only takes between 2-4 ounces of brake fluid to swell the seals in a transmission. If this occurs, your seals will become ruined and you'll have big problems to deal with.

#802921 - 06/16/10 05:14 AM Re: Brake fluid in transmission [Re: Bri86SS]  
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greenmoonshine Offline
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How in the world did you get those 2 containers mixed up?
Seriously, thats like grabbing a wrench when looking for a screwdriver.
Yeah wow......thats sound like an awful allot of flushing to get almost 2oz out, how much does a tranny flush go for these days?

Last edited by greenmoonshine; 06/16/10 05:15 AM.


Two Lane Blacktop
#802922 - 06/16/10 05:31 AM Re: Brake fluid in transmission [Re: greenmoonshine]  
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just go to a valvoilne or trans shop a flush costs about $120 OR you can do the jimmy rigged way in your garage... Unhook one line off the trans cooler or radiator and put a rubber hose on both connections where unhooked. determine which line sucks the fluid and what line will spit the fluid. use a 5 gallon bucket for the like that spits it out. Run the car untill the line that spits it out bubbles THEN SHUT OFF RIGHT AWAY!! hook the line back up fill with cheap fluid and reapeat the process then refill with your prefered fluid. this is not a professional way of doing but shouldent damage anything if you shut the car off right away. (might want a second person to shut the car off if doing it) I worked at Valvoline for 2 years and did tranny flushes etc.. that basicly all it is except we pump new fluid in while taking the old out.

Last edited by montesleeper83; 06/16/10 05:39 AM.

83 Monte CL "rat rod" project
95 GMC Safari daily driver
#802988 - 06/16/10 03:42 PM Re: Brake fluid in transmission [Re: montesleeper83]  
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Originally Posted By: montesleeper83
just go to a valvoilne or trans shop a flush costs about $120 OR you can do the jimmy rigged way in your garage... Unhook one line off the trans cooler or radiator and put a rubber hose on both connections where unhooked. determine which line sucks the fluid and what line will spit the fluid. use a 5 gallon bucket for the like that spits it out. Run the car untill the line that spits it out bubbles THEN SHUT OFF RIGHT AWAY!! hook the line back up fill with cheap fluid and reapeat the process then refill with your prefered fluid. this is not a professional way of doing but shouldent damage anything if you shut the car off right away. (might want a second person to shut the car off if doing it) I worked at Valvoline for 2 years and did tranny flushes etc.. that basicly all it is except we pump new fluid in while taking the old out.

Man, I have to say that I think this would be the route I would go. Its cheaper and you would have some peace of mind along with it. I would use the regular tranny fluid and wait a few thousand miles before replacing with synthetic.......if thats what you decide to put back in.



Two Lane Blacktop
#803020 - 06/16/10 06:42 PM Re: Brake fluid in transmission [Re: greenmoonshine]  
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200R4 trans hold about 10 quarts tranny fluid. There are 32oz in 1 quart. Therefore 320oz in 200R4. Assuming 2oz brake fluid, 322/320=1.00625 Converted to percent is .01% I personally would leave it in there but, as I don't want to play devil's advocate, I'd say drain/pump it out by taking off the tranny cooler line at the cooler and then refilling.



86 MCSS 408sbc, T56, 8.5" 3.73 posi 12.3 @ 113mph, 23 mpg hwy
#803037 - 06/16/10 08:11 PM Re: Brake fluid in transmission [Re: Lincoln7]  
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Go ahead and at least change your fluid and filter.How the Heck did you goof that one up???? I alway say lay off the booze til the work's done...JMO


1984 Monte Carlo sbc bored/stroked to 388 c.i. 514 Dynoed HP.700r4 w/2000 stall,12 Bolt w/4:10
Old Chevy's Don't Die, They Just Get Faster
Best E.T. to date : 12.20 @ 110 MPH All Motor
#803269 - 06/17/10 09:59 PM Re: Brake fluid in transmission [Re: JBreu]  
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.. Guess it amounts to how brave you are... I would just leave that small of an amount in...


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#804022 - 06/21/10 03:58 AM Re: Brake fluid in transmission [Re: BuzzLOL]  
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monsterjam5000 Offline
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I'm thinking of getting a couple gallons of trans fluid and pouring them in a five gallon bucket.
Then unhook both trans lines and let on spit trans fluid in the empty bucket and let the trans pull new fluid from the full bucket.
Start the car and let it run until the full bucket become empty and the empty bucket becomes full that should get all the trans fluid out right

#804073 - 06/21/10 11:17 AM Re: Brake fluid in transmission [Re: monsterjam5000]  
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85t5mcss Offline
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In theory that is how a flush machine works. So yes. May have to elevate the fill bucket so gravity will help with filling it back up. Also mark the sides of the buckets so that 1 will fill and 1 will empty at about the same rate. This will help u keep an eye on it.


1985 Monte Carlo SS, T-Tops, 355cid w/ AFR 195s 409HP/429TQ, C5 Front Brakes, T5 5 Speed, QA1 Adjustable shocks/springs Front and Rear blah, blah, blah..........
Silly "Ricers", useless wings are for penguins!
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