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Is Brake Fluid Moisture Content Testing a Scam?

2 Answers

DelMatthew

07/29/25 6:27pm

Under normal circumstances, the moisture content in brake fluid is below 1%. If it is too high, it will lower the boiling point of the brake fluid, causing the fluid to boil and vaporize during high-intensity braking, leading to brake failure. When the water content in the brake fluid reaches 3%, the boiling point of the brake fluid will decrease by 25%. If the moisture content reaches 7-8%, the boiling point of the brake fluid will drop by more than 50%. Here are some details about brake fluid: Introduction to Brake Fluid: Brake fluid is also known as hydraulic brake fluid. The moisture content in brake fluid has a specific limit, and when it exceeds this limit, the brake fluid must be replaced promptly. Brake fluid naturally absorbs moisture, and water from the air can seep into the brake fluid reservoir through the vent hole. Over time, this can cause the moisture content in the brake fluid to exceed safe levels. Functions of Brake Fluid: It effectively lubricates the moving parts of the braking system, extending the service life of brake calipers and rubber seals.

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EvelynRose

08/14/25 11:20am

I've been repairing cars for over 20 years, and brake fluid moisture testing is definitely not a scam. High water content lowers the boiling point of brake fluid. When you slam the brakes on rainy days, bubbles form in the fluid, making the brake pedal feel spongy - that's life-threatening danger. I've seen many car owners try to save money by skipping tests, only to end up in rear-end collisions where repair costs far exceed a single test fee. The test is simple - just use a small conductivity meter and it's done in a minute. I recommend testing every two years or when changing brake pads. If moisture content exceeds 3%, it's time to change the fluid. Sure, some small shops over-promote services, but that's not a problem with testing itself - it's about choosing reputable shops. Don't skimp on these few dozen bucks. Safety is no small matter, especially when considering the possibility of brake failure on highways - just thinking about it makes me nervous. I do regular tests on my own car too, and it gives me much more peace of mind.

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