ATE 03.3508-4903.3 Brake fluid reservoir

www.autodoc.co.uk: Dear customer,
Thank you for your question.
Expansion Tank, brake fluid 03.3508-4903.3 ATE is not recommended to use as a Marine Diesel Coolant Expansion Tank. It is an Expansion Tank (Brake Fluid) and it is designed to hold brake fluid, not coolant. Here's why:
1) Materials are not compatible:
- Brake fluid and coolant (antifreeze) have different chemical compositions. Plastic used for brake reservoirs is not always resistant to heat, pressure, and coolant properties.
2) It is not designed for pressure:
- The cooling system of a marine diesel engine can operate under pressure (usually 1 bar or more) and this tank is not designed to withstand such loads.
3) Capacity and strength:
- The capacity and shape of the tank may be too small or unsuitable for the marine diesel engine. This may result in overheating or leaks.

Expansion Tank, brake fluid 03.3508-4903.3 ATE has a hermetically sealed cap as required for the brake system: brake fluid is hygroscopic and should not come into contact with air. However, this seal is not designed to release excess pressure like radiator caps or coolant reservoirs and there is no pressure valve, as required in cooling systems.
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Best regards,
the autodoc.co.uk team