Brake Master Cylinder and Brake Fluid

[AlWakRa]

Hello everyone,

Today I received my car after installing some parts including a brake SS lines and changing fluid from OEM to Motul rbf600. Everything seems alright. The issue here is my mechanic recommended me against changing OEM Dot 3 to Dot 4 and made me sign on taking the responsibility myself if anything went wrong with the brake system .

The reason he gave me is

"The brake master cylinder of the Z is designed for Dot 3 fluid types and it shouldn't be used with any other than that type, as the materials of the bmc is not compatible and it might cause fire in the system "

I am not an expert in these things but I just cannot understand his point (which made me insisting to go forward with the motul) and at the same time I cannot overlook what he said. Maybe he is mis-informed about it, maybe the difference of climate is one point to consider (as here in Qatar it can reach 50 Celsius and it is very humid in summer). So I just want to make sure of this point.

Also, how often to change the fluids? As I read here, every 6 months seems right. Maybe I should go for every 4 months as the weather here is very humid at times?


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