Final answer:
A 'Metering valve gauge' is not used to determine whether brake fluid should be flushed. The correct methods include following the manufacturer's service interval, performing a boiling point test, and using a test strip.
Step-by-step explanation:
The question is regarding the methods used to determine if brake fluid should be flushed in a vehicle. All of the following options, except one, can be used to evaluate brake fluid condition:
- Manufacturer’s time/mileage specification – This involves following the vehicle manufacturer’s recommended service interval for brake fluid replacement, which is usually based on mileage or time.
- Boiling point test – In this test, the boiling point of the brake fluid is measured to determine if it has degraded, as brake fluid with a low boiling point can lead to brake system failure.
- Using the test strip – Test strips can reveal the moisture content in the brake fluid, which can indicate if the fluid is contaminated and needs to be replaced.
The incorrect option is:
Metering valve gauge – A metering valve gauge is not typically used to test brake fluid condition; it is part of the brake system designed to regulate pressure to the brakes, ensuring proper operation.
Therefore, the answer is 'c. Metering valve gauge' which cannot be used to determine if the brake fluid should be flushed.