Brake Fluid Identification

[Gerald C.]

I just drained the brake fluid out of my m/c on my 1967 non pb car. My question is "how do I tell which type of brake fluid I have"? I appreciate any guidance.

Thanks

Jerry

[Joe L.]

Re: Brake Fluid Identification

I just drained the brake fluid out of my m/c on my 1967 non pb car. My question is "how do I tell which type of brake fluid I have"? I appreciate any guidance.

Thanks

Jerry

Jerry------


All you need to know is if it's a glycol ester based fluid (DOT 3, 4, 5.1) or a silicone based fluid (DOT 5). All glycol ester fluids are compatible.

Take some of the fluid you have and place it in a small glass jar. Fill the jar about half full with the fluid and fill the rest with water. Shake it up and let it sit for 15 minutes. If after sitting if the fluid in the jar is completely mixed and homogeneous, then you have a glycol ester-based fluid. If there is a phase separation (two distinct layers like oil and water), then you have silicone-based fluid.

[Gerald C.]

Re: Brake Fluid Identification

Joe

Thanks!!!

Jerry

Jerry------


All you need to know is if it's a glycol ester based fluid (DOT 3, 4, 5.1) or a silicone based fluid (DOT 5). All glycol ester fluids are compatible.

Take some of the fluid you have and place it in a small glass jar. Fill the jar about half full with the fluid and fill the rest with water. Shake it up and let it sit for 15 minutes. If after sitting if the fluid in the jar is completely mixed and homogeneous, then you have a glycol ester-based fluid. If there is a phase separation (two distinct layers like oil and water), then you have silicone-based fluid.

[Gerald C.]

Re: Brake Fluid Identification

Joe,

It mixed so it's glycol ester-based. Does it make a difference in which one I use....DOT 3,4,5.1?

Thanks

[Terry M.]

Re: Brake Fluid Identification

Joe,

It mixed so it's glycol ester-based. Does it make a difference in which one I use....DOT 3,4,5.1?

Thanks