Q45 V8-4.5L (VK45DE) (2002)
Brake Fluid: Testing and Inspection
Checking Brake Fluid Level
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Check fluid level in reservoir tank. It should be between Max and Min lines on reservoir tank.
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If fluid level is extremely low, check brake system for leaks.
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Release parking brake lever and see if brake warning lamp goes off. If not, check brake system for leaks.