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  #1  
Old 09-22-2008, 11:26 PM
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Is DOT 4 Synthetic brake fluid OK?

That's what the label says.

I know DOT 4 is good. I know synthetic brake fluid is bad (not compatable)

I'm confused

Can anybody un-confuse me?

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Old 09-23-2008, 12:03 AM
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Synthetic fluid has longer life and is less prone to breakdown, flush total system and then add the fluid. I use Castrol synthetic DOT 4 and it has never let me down.
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  #3  
Old 09-23-2008, 05:59 AM
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Like synthetic vs. dino oil, you either use one or the other. Like Gurkha said, flush the current fluid out before performing the transfusion...
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  #4  
Old 09-23-2008, 07:41 AM
you bought what???
 
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I won't use anything other than Castrol LMA or MB brake fluid.

I tried DOT 4 synthetic once, and it left me with a spongy brake pedal. The local mcparts store doesn't carry it anymore due to the high number of complaints.
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  #5  
Old 09-24-2008, 02:03 AM
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Funny you should say that, that's my problem. I've always used it but the new bottles say Castrol GTLMA Synthetic Brake Fluid , DOT 3 and DOT 4.
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  #6  
Old 09-24-2008, 02:04 AM
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I think DOT 5 (the silicone stuff) is the fluid spec to stay away from. DOT 4 synthetic should be okay - I used it in my 300E and it worked great.
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  #7  
Old 09-24-2008, 02:30 AM
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DOT 5 IS the Silicone

TonyB is right.

AND you have to replace EVERY rubber part in the system...First.

AND you have to "FLUSH" the system with Brake Cleaner...First.

BUT I would not attempt to "Flush" an ABS unit with Brake Cleaner , So I
think you're out of luck as far as DOT 5 is concerned.

DOT3 OR DOT4 are both fine...

"Mushy" pedal is air.

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