Is DOT 4 ok for clutch fluid
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Is DOT 4 ok for clutch fluid
So I changed my clutch fluid used dot 4 instead dot 3 thinking higher boiling point. in traffic sometimes clutch pedal seems to get soft. So I put in dot 4 pedal seems smother also easier to depress clutch. So ? is should I leave the dot 4 in or go back to dot 3. not sure if pedal is softer because new fluid or using dot 4 I like the stiffer pedal. My clutch line is heat wrapped. 2004 roaster 45,000 miles all stock.
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Thanks
Last edited by Suffolk350z; 05-15-2015 at 07:03 AM.
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#5
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DOT 5 brake fluid is NOT interchangeable, so don't use it in a system that has DOT 3/4 fluid in it. As for the viscocity of the fluid itself, it shouldn't make much difference. Each brake fluid has a particular wet and dry boiling point and the higher the better for performance purposes.
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DOT 5 brake fluid is not recommended by Nissan for use in the Z33. It's also impossible to completely flush all traces of DOT 3/4 fluid from a brake system. Overkill indeed, I don't use DOT 5 in either my street or race Zs...
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#8
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I doubt the seals are compatable, now I know dot 5.1 can be used.
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This thread has become overly complicated because of all the contributions. The original question was whether DOT 3 or DOT 4 brake fluid was better for use in the clutch line? To recap:
-Either can be used (plus DOT 5.1 if it's available), as they are all poly glycol-based fluids which is what Nissan designed the clutch and brake lines/seals for.
-Viscocity is not a key factor in performance of brake fluids, but dry and wet boiling points are. The higher, the better, for use in a high performance vehicle.
-This board has several threads on brake fluid recommendations, so a search will help determine what the best combination of cost, performance and durability will be on products available in YOUR area of the country.
-Either can be used (plus DOT 5.1 if it's available), as they are all poly glycol-based fluids which is what Nissan designed the clutch and brake lines/seals for.
-Viscocity is not a key factor in performance of brake fluids, but dry and wet boiling points are. The higher, the better, for use in a high performance vehicle.
-This board has several threads on brake fluid recommendations, so a search will help determine what the best combination of cost, performance and durability will be on products available in YOUR area of the country.
Last edited by dkmura; 05-24-2015 at 06:20 AM.
#10
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You got it backwards. DOT 5 is silicone based and is NOT recommended. DOT 3, 4, and 5.1 are glycol based and ARE compatible.
Last edited by i8acobra; 05-24-2015 at 06:02 AM.
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