Jim-When Yahmaha went to the larger brakes in 1993, they felt that they could
generate more heat, thus recommended DOT 4 with a higher boiling point. No
problem, they are compatible. Just add DOT-4 to the master cylinder and bleed
untill clear fluid comes out.. Suggest you bleed/flush annually.
Scott VMOA #500
Jim McCormick wrote:
> I just replaced the damaged front brake master cylinder on my '85 Max with
> one from a '98. My '85 is marked for Dot 3 brake fluid, and the '98 unit is
> marked for Dot 4. The old Dot 3 fluid is still present in the front brake
> system in the lines and calipers. Are there any compatibility problems? I'd
> like to use Dot 4, but I'm not sure if I'm going to have a problem. Any help
> would be greatly appreciated.
>
> Thanks,
> Jim McCormick
> VMOA #889
> '85 Max
> '74 Z1
>
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