OT Brake fluid for older cars

coshoo · May 28, 2016

Need to bleed the brakes on my '48 Hudson, after putting on new wheel cylinders. Have some DOT 3 brake fluid- is that the proper stuff? Looked in the manual, no help, I guess brake fluid back in those days didn't have any DOTs.

504 · May 28, 2016

It is all compatible,use whatever you have on hand.

Old weldor · May 28, 2016

Do not mix silicone brake fluid with regular brake fluid. They are not compatible.

Steve@Advance · May 28, 2016

Use anything glycol based, DOT 3,4, or 5.1.

The only thing you cannot mix is DOT 5, which is silicon based.

If you ever find it necessary to completely go through the brake system, replace or kit all the wheel cylinders and master cylinder, and thoroughly flush the lines, then you could change over to DOT 5.

It is a favorite for collector vehicles and recreational vehicles that do a lot of sitting because it does not absorb moisture. It won't rust the bottom of the cylinders or form the black goo that glycol fluid does.

I had the brake system open on a 20 year old Harley, had DOT 5 from the factory. The fluid looked perfectly clear!

markct · May 28, 2016

Not sure where you got that info but bad things happen if you mix silicone i.e. DOT 5 with regular, or mineral oil like the Ford tractor brakes used

OT Brake fluid for older cars

coshoo

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504

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Old weldor

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Steve@Advance

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markct

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