Brake Fluid Safety Meter
Brake Fluid Safety Meter

Brake Fluid Safety Meter

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Brake Fluid Safety Meter
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Check condition of brake fluid in less than a minute! Water can enter a brake system through microscopic holes anywhere in the system. Once inside, it can cause corrosion in system components it can vaporize under the high heat conditions of hard braking situations it can cause dangerous degradation of your customer's ability to stop safely! The No. OTC-3890 lets you find out if your customers are safe or not in under a minute. It actually boils a small sample of brake fluid in the reservoir to test for water contamination.


  • Powered by the vehicle battery; wont' operate if connected to the wrong polarity
  • On-screen prompts lead you quickly through testing
  • You'll find the minimum boiling (vaporizing point) along with minimum recommended levels for various types of brake fluid
  • Works on DOT 3, DOT 4 and DOT 5.1 fluids
  • No consumable test strips, buy this tool and test every vehicle that comes into your shop


Accuracy 2120 - 3560F

1% typical, 3% max.

Accuracy above 3560F

3% typical, 5% max.

Testing Time

15 - 60 seconds

Operating Temp Range

320 - 1220F

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