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  #21 (permalink)  
Old 06-17-2006, 03:49 PM
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Is it true that all DOT 5 fluid is purple? If so, I should be OK adding some DOT4.
Round midnight, good question if you have DOT 5 now as I've reaqd that DOT 5 is not too compatible. You can go up easily, not down.
John
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  #22 (permalink)  
Old 06-17-2006, 03:51 PM
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I have a can (plastic can) of DOT 5 right now, it is NOT 'purple', it is clear and looks exactly like DOT 3 or 4. Very easy to mix them up!
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  #23 (permalink)  
Old 06-17-2006, 04:32 PM
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Excaliber, thanks, I am all confused now.......
Any advice what to add to what I can add?
Thanks
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  #24 (permalink)  
Old 06-19-2006, 02:29 AM
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Default Jay!

Jay....Perhaps you are talking about DOT 5.1 brake fluid not silicone based....isn't it? MOTUL has one good reported http://motorspot.com/dir.cfm?secid=5...TOKEN=20187295

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Alfonso
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  #25 (permalink)  
Old 06-24-2006, 07:24 AM
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My DBR #329 states DOT 5 (purple) in the manual, but it had DOT 4 in both the brakes and clutch.

Shaun
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  #26 (permalink)  
Old 06-24-2006, 08:00 AM
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BDR #291 has purple fliud in the brake master cyl. and the manual states it is DOT 5. Seems like it's up the the shop that builds them.
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  #27 (permalink)  
Old 06-24-2006, 08:55 AM
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...hope it wasn't clear DOT 5!
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  #28 (permalink)  
Old 06-25-2006, 09:56 PM
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Just picked up on this thread. I have #128 and was told to use Dot 5 in the brakes and Dot 3 (or 4) on the clutch. I bled my clutch before the WSCBash and it came out black and heavy (sank to the bottom of the bleed bottle). Burned I assume from the header heat. I talked to Papa Frank at the Bash and he said to use synthetic DOT 3 in the clutch but I checked temperature ratings and am sticking with Castrol DOT 3/DOT 4. I am replacing my clutch master (from Summit) and rebuilding the actuator. Wrapped the clutch cyl with ceramic insulation.
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  #29 (permalink)  
Old 07-27-2018, 05:13 AM
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Default Dot 4 or 5??

I recently changed the brake pressure switch on my BDR. It was located at the bottom end of the master cylinder so some brake fluid drippled put when I removed the switch. That fluid was not purple so I added some Modul 600. What will happen "IF" I added a small amount of Dot 4 to Dot 5?
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  #30 (permalink)  
Old 07-27-2018, 09:13 AM
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Originally Posted by ront49 View Post
I recently changed the brake pressure switch on my BDR. It was located at the bottom end of the master cylinder so some brake fluid drippled put when I removed the switch. That fluid was not purple so I added some Modul 600. What will happen "IF" I added a small amount of Dot 4 to Dot 5?
That would be a bad day. They are totally incompatible.

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  #31 (permalink)  
Old 07-27-2018, 04:09 PM
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Old Dot 5 fades depending on age . The test is to add a few drops of water to some of it in a small vial. if the water and fluid repel it is silicone if it mixes it is dot3 or 4 glycol.
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  #32 (permalink)  
Old 07-28-2018, 06:04 AM
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Default Mix?

So what will happen if I mixed a very little amount of Dot4 in with Dot5?
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  #33 (permalink)  
Old 07-28-2018, 06:20 AM
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Default Mix

OK, I just tried the "mix" and the results are in ... Car has about 3500 miles built in '04 so I'm taking a chance on saying it has the original brake fluid. It is clear. I added a few drops of it to some water and it mixed ... made the water cloudy but did not separate like oil would ... so I'm fairly confident the car had Dot 3 or 4 in it already.
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  #34 (permalink)  
Old 07-28-2018, 07:30 AM
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Quote:
Originally Posted by ront49 View Post
OK, I just tried the "mix" and the results are in ... Car has about 3500 miles built in '04 so I'm taking a chance on saying it has the original brake fluid. It is clear. I added a few drops of it to some water and it mixed ... made the water cloudy but did not separate like oil would ... so I'm fairly confident the car had Dot 3 or 4 in it already.
Final test would be find a sacrificial object with paint and apply some of the brakefluid. If it eats the paint offit is dot 3 or 4 if no reaction then it is silicone.
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  #35 (permalink)  
Old 07-28-2018, 07:39 AM
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Final test would be find a sacrificial object with paint and apply some of the brakefluid. If it eats the paint offit is dot 3 or 4 if no reaction then it is silicone.
Uhhh, like the hood scoop?
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  #36 (permalink)  
Old 07-28-2018, 07:43 AM
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Uhhh, like the hood scoop?
If that is what you would use and consider sacrificial. I had an old license plate factory blank that is what I used .
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  #37 (permalink)  
Old 07-28-2018, 07:49 AM
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If that is what you would use and consider sacrificial.
Well, I guess if I had a BDR...
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  #38 (permalink)  
Old 07-28-2018, 09:09 AM
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Uhhh, like the hood scoop?
Or something beige colored...
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  #39 (permalink)  
Old 07-31-2018, 06:53 AM
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Well, I guess if I had a BDR...
I resemble that remark
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  #40 (permalink)  
Old 05-30-2019, 10:31 PM
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Hello!
I would like to change my brake and clutch fluid.
The brake fluid looks like it is dot5 because it doesn‘t harm to paint, but it is clear colored.
Is it possible to flush the backdraft brake fluid with dot 4, because I would like to have just one sort of fluid in the clutch and brake system?
My car has the standard brake system with ate parts in it and it is from 2008.
Would be glad to get the right information.

Thanks Marc
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