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Mechanical Engineering - Automobile Engineering - Discussion

Discussion Forum : Automobile Engineering - Section 1 (Q.No. 33)
Automobile Engineering
33.
The difference between DOT 3 and DOT 4 brake fluids is
DOT 4 fluid has a higher boiling point than DOT 3 fluid
DOT 4 fluid has a lower boiling point than DOT 3 fluid
DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluid is more resistant to freezing than DOT 3 fluid
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
5 comments Page 1 of 1.
Mahavir said:   1 decade ago
DOT means Department of Transportation. Brake fluids and clutch fluids are classified under this name called DOT.

DOT 3 - Glycol Ether (Boiling point- 140 °C (284 °F).

DOT 4 - Borate Ester (155 °C (311 °F).
(1)
K.NATRAJ said:   1 decade ago
Why not freezing resistant. If boiling point is higher means automatically freezing resistant is also more.
(1)
AMARCHAND said:   1 decade ago
What means of DOT?
Pratik said:   9 years ago
Dot 3, 4, and 5.1 are glycol ether based. They are compatible, but like motor oils, you should use the recommended or higher grade fluid. Dot 4 and 5.1 also have borate ester to handle higher temperatures. DOT 3, 4, and 5.1 fluids are found in most brake and clutch systems.
Navneet kumar said:   4 years ago
Here one important point is to note that ethylene glycol is used as antifreeze solution in automobiles.
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