Level Check

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

Check that the fluid level in the reservoir tank is within the standard (between MAX and MIN lines).
Visually check around the reservoir tank for fluid leaks.
If fluid level is excessively low, check brake system for leaks.
If warning lamp remains illuminated after parking lever is released, check brake system for fluid leakage.

Fig 1: Inspecting Level Check
Courtesy of NISSAN MOTOR CO., U.S.A.