The BST01 Professional Brake Fluid Quality Tester is a precise and reliable device for checking the water content in a vehicle's brake system. With this tester, you can easily monitor the condition of your brake fluid and prevent serious braking problems.
Brake fluid is hygroscopic and absorbs moisture from the atmosphere. On average, over 2 years of use, 2–5% water accumulates in the system. This lowers the fluid’s boiling point and causes vapor to form when heated. Unlike fluid, vapor compresses, leading to a «spongy» brake pedal, uneven braking force, and difficulty in modulation.
A second serious issue is corrosion of metal parts. Moisture in the brake system causes rusting and seizing of caliper pistons, leading to sticking, overheating, and even smoke. Often, after repair, the problem recurs due to ongoing corrosion.
Using the tester is simple: place the contacts into the brake fluid reservoir, and the indicators will show the water percentage. This helps you replace the fluid in time and avoid costly brake system repairs.
Instructions for use:
- After use, wipe the contacts dry.
- If fluid gets on the plastic housing, rinse it with water.
- Do not store the device with brake fluid residue — it is an aggressive substance that can damage plastic.
- If brake fluid comes into contact with vehicle paint, rinse immediately with water.
Power is supplied by 1 AAA battery (not included).
Price: 14 EUR. Product code: BST01.
Below is a video demonstrating the tester in action. The first test uses new brake fluid, followed by tests with gradually increasing water content.
Comparative table of BST01 tester advantages:
| Problem | Result without tester | Result with BST01 tester |
|---|
| High water content | Lower boiling point, vapor, spongy pedal | Timely fluid replacement, precise brake response |
| Corrosion of parts | Rusty pistons, seized calipers | Prevention of corrosion, extended brake system life |
| Diagnosis difficulty | Need for service visits, high repair cost | Self-test in minutes, repair cost savings |
The BST01 tester is not just a tool — it is essential for safe vehicle operation. Brake fluid quality should be checked regularly, especially in humid conditions or with intensive vehicle use. Get the BST01 tester and ensure reliable brake performance for years to come.