I got a stupid question

[SteelNinja]

My brake fluid needed topped off so I put in dot5 , but now Im thinking how do I know what fluid was in it to start with? it is a menmphis equipment truck ( if anyone knows what they might use..
I got to drive my deuce in the am cause my transmission went out in my work truck.. So driving the deuce is a must.. any advice is appreciated

 

[NDT]

Well I suppose you could stick your finger in there and see if the fluid has that distinctive old school brake fluid smell. Regardless you probably don’t need to flush the system tonight.

 

[SteelNinja]

I may see in the morning If I can get all the bleeder screws to break loose then just run the dot5 thru it? Im guessing start bleeding at the right rear and work my way up to the airpack. Thanks

 

[kendelrio]

Another option is to reach out to Memphis. I'm sure they have records of what they did to the truck.

 

[Adrok]

Was the existing fluid the same color you poured in? Purple like the silicone DOT5, or clear/ yellow for DOT3. Hopefully you can tell if you crack a bleeder.

Cheers

 

[SteelNinja]

I got the fluid out ( never did push the pedal when I refilled it)
Memphis Equipment was helpful they said" they convert all dot 5 to dot 3
now theres a new problem I started bleeding the master on the bleeder at the master cylinder /air pack.. It bleed fine but the pedal got worse, so I went to the rear and bleed the right rear and lost all pedal... Its doing nothing except at the very very bottom of the pedal .. I dont see how. The air pack bad? bad master cylinder? its been a rough week - even my dog had to go to the vet and they cant figure whats wrong.. I dont think he'll make it.. anyway any advice would be great. Thanks

 

[HDN]

Was the existing fluid the same color you poured in? Purple like the silicone DOT5, or clear/ yellow for DOT3. Hopefully you can tell if you crack a bleeder.

I don't believe that's always reliable as DOT-5 will turn yellowish as it gets older.

I didn't realize that Memphis Equipment put DOT-3 in their trucks - that's good to know! I'm guessing they'd put DOT-5 in them if you wanted them to, but you'd probably have to pay for that.

I did a quick search on here and found a post from about 16 years ago that details how to tell which brake fluid you have in your brake system:

1. Get a dropper (an eye or ear-dropper) and withdraw some fluid from the master cylinder.
2. Put it into a glass jar and then add some clean water to the fluid.
3. Now put the lid on the jar and shake it well.
4. Let it stand for a few minutes.
5. If the water and the fluid have mixed thoroughly and can not be separately identified, then you have regular auto brake fluid.
6. However, if the water and the fluid have not mixed, or have formed blobs or layers, then the fluid is Silicone.

For reference, DOT-5 is silicone-based.

 

[SteelNinja]

at least we all now know memphis equipment uses dot 3..they were really helpful when I called ...

 

[byrdman1312]

I have a stupid question too. After removing the DOT 5, could you use DOT 3 in a Gamagoat? DOT 5 was used in them because they were, allegedly, amphibious. Thanks

 

[Mullaney]

I have a stupid question too. After removing the DOT 5, could you use DOT 3 in a Gamagoat? DOT 5 was used in them because they were, allegedly, amphibious. Thanks

.
I think the Goat was built back in the days when nothing was available EXCEPT regular old DOT3.
Maybe I missed my guess - or maybe time has flown by me...

There is no reason why if you blow out the fluid you have - that you can go back with DOT 3.

 

[NDT]

Goats were manufactured with dot 3 but got converted over to silicone in the 80s like everything else the Army had. Silicone fluid is perfect for vehicles not driven very much.

 

[HDN]

Today I was checking the brake fluid on my truck. I always assumed the yellow stuff was DOT 5, but never knew for sure. So I tested it:

Brake fluid sample from reservoir:



Sample mixed with water:



I stirred the beaker with the end of my turkey baster to see if the fluids would mix. Since the fluids separated, I know I have DOT 5 brake fluid in my truck.

 

[SteelNinja]

Thats kool Thanks for the info

 

[G744]

Best not to just 'blow' the old fluid out with air.

Run enough denatured alcohol thru it first and let that remove any residue & water,

Highly recommended to get a pressure bleeder unit and use it, makes the job so much easier. It will have a large reservoir for the fluid of your choice, and keeps the system under pressure so you can bleed it out easily without pumping the pedal and having to have 2 people doing the job.

 

[SteelNinja]

I got a new master cylinder and need to rebuild the air-pack