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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2012 Posts: 339 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 339 | GETTING READY TO BLEED THE BRAKES ON THE '36. IT;S A DISC/DRUM RESTRO MOD. SHOULD I USE DOT 3,4 OR 5 SYNTHECIC? IT'S NOT READY TO BE DRIVEN JUST YET, BUT WILL BE SHORTLY.
1936 GMC T-14 restro-mod
| | | | | Joined: Oct 2021 Posts: 6,772 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,772 | What fluid is in it now? If it isn't DOT 5, you'll have to flush the entire system with alcohol before filling with DOT 5.
DOT 3, DOT 4, and DOT 5.1 are compatible with each other.
DOT 5 is 100% silicone and cannot be mixed with the others. If you have anti-lock brakes you cannot use DOT 5.
Are you drag racing it or auto-crossing in it? If not you really won't have a need for DOT 5.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Oct 2012 Posts: 339 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 339 | The system is virgin right now, No it's just a street cruiser, run to the store or the parts house. Just thought dot 5 would be better for a truck that's not driven every day or in rainy weather. So sounds like dot 4 it is.
1936 GMC T-14 restro-mod
| | | | | Joined: Sep 2020 Posts: 449 'Bolter | | 'Bolter Joined: Sep 2020 Posts: 449 | Use dot 3, iirc it absorbs less moisture….not as high performance but neither are we, need to change it less often…….
Hank: 46 Chev 1/2ton shortbed
2023 Miata RF Club
| | | | | Joined: Oct 2018 Posts: 97 'Bolter | | 'Bolter Joined: Oct 2018 Posts: 97 | I use DOT 3 on all my antique autos including my 46 GMC. Do a web search and you will see why.
1946 with WWII 270
| | | | | Joined: Oct 2012 Posts: 339 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 339 |
1936 GMC T-14 restro-mod
| | | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | At the end of the day, it is your call based on what you want. Any of those choices will function fine and be safe.
I personally went with DOT3 when I replaced my entire brake system this fall because it is cheap, readily available, absorbs the least water, and has more performance than I need. | | |
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