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Topic: What do all the DOT's mean? (Brake Fluid)

in Forum: C3 Driveline Components

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What do all the DOT's mean? (Brake Fluid) (1/4)
 1/4/23 11:06am
Kenny78Gold Member
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Toms River, NJ - USA

1978 Silver Anniversary Coupe Lt. Biege w/ Dark Brown Int. Happily owned since 1981.

Joined: 7/28/2004
Posts: 115

Hi all,

What do  all the different DOT's mean🤔.Decided to go with Dot 5 synthetic brake fluid . Head to local store to purchase and discovered there are DOT 3, 4, 5, 5.1 and 4&5 which are all synthetic. Now I am totally baffled on which DOT to choose. 🤦‍♂️The brands were Prestone and Car Quest. Should I stay with the Chevrolet recommended DOT 3 and switch to synthetic DOT 3 or go with Dot 5 since I do not drive it a lot. Thanks for any clarification on this.

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Re: What do all the DOT's mean? (Brake Fluid) (2/4)
 1/4/23 11:33am
Adam WartellLifetime Member
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Eagleville, PA - USA

Used to own a 1979 Corvette now owned by JB79

Joined: 11/1/2001
Posts: 17423

The DOT number indicates the boiling point of the fluid. The higher the DOT number the better quality the hydraulic fluid and the greater the ability to withstand a high temperature and performance environment.

I found this thread that already talks about this same topic.... which may help you...




-Adam Wartell
NCM Lifetime Member #1222
Founder: C3 Vette Registry 
C4 Vette Registry, C6 Vette Registry

My first Vette, now owned by JB79:

Re: What do all the DOT's mean? (Brake Fluid) (3/4)
 1/4/23 3:43pm
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Overland Park, KS - USA

1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 848

Here you go.



1973 L-82 4 spd

Re: What do all the DOT's mean? (Brake Fluid) (4/4)
 1/4/23 5:33pm
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Grapevine, TX - USA

1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 1361

I'd stay away from Dot 5.  It is silicone based and you have to completely clean/flush your whole brake system.  Not compatible with any others.

Dot 3, 4, and 5.1 are not silicone based and I believe are all compatible. No reason not to use them.



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