Phoenix Systems Brake & Coolant Test Strips — 500 Dual-Ended Strips, Fast 60–90s Results

Phoenix Systems 500 double-ended Brake & Coolant Test Strips are dual-purpose paper strips that reveal brake fluid corrosion and coolant glycol/pH levels in under two minutes for clear, repeatable maintenance decisions.

Stop guessing when to service two of the most critical vehicle fluids. These dual-ended strips let you test brake master cylinder fluid and engine coolant with one tool. The brake end reports corrosion by changing from white to purple proportionally, while the coolant end shows glycol concentration and pH through separate color pads. The process is fast, simple, and produces visual, scientific evidence you can keep for records or show to a technician.

How do these strips show brake fluid condition?

Dip the brake end of the strip into the brake master cylinder reservoir (with the vehicle off and cap removed). The test reacts to corrosion products and moisture; the white pad will turn shades of purple to indicate increasing corrosion. Stronger purple means the fluid has degraded and lost protective properties.

• Single dip into brake reservoir — result in about 60–90 seconds
• Color change correlates with corrosion level for repeatable checks
• Works with DOT 3, 4 and 5.1 fluids, including synthetic formulations

What does the coolant end measure and how should I read it?

The coolant side has two pads: one that indicates glycol concentration and one that measures pH (acid vs. alkaline). Glycol pads shift pink to red/blue depending on antifreeze percentage; pH pads range orange to green based on acidity. Low glycol or acidic results warn of faster corrosion and freeze/overheat risk.

• Dip into coolant after engine has cooled and radiator cap is safely removed
• Glycol color estimates coolant percentage; pH shows acidity level
• Use results to decide if coolant needs replacement or if additives are needed

Which vehicles and fluids are compatible with these strips?

These test strips are formulated for broad compatibility: they work with all coolant colors and common brake fluids, including DOT 3, DOT 4 and DOT 5.1. They are suitable for gasoline and diesel cars, trucks, motorcycles and many off-road machines where those fluids are used.

• Compatible with conventional and synthetic brake fluids
• Effective across OAT/HOAT/LONG-LIFE coolant types and colors
• Handy for fleet, shop, and DIY vehicle maintenance checks

How quickly and reliably do the strips provide results?

Results are readable in about 60–90 seconds and are designed to be repeatable so you can track fluid condition over time. The visual color changes provide a straightforward, scientific indicator rather than a subjective opinion, helping you make informed maintenance choices.

• Visual, repeatable results suitable for records or proof to a technician
• Pack of 100 double-ended strips yields 100 brake and 100 coolant tests
• Fast check avoids unnecessary fluid changes and prevents missed failures

Who is this for? If you maintain a personal vehicle, manage a fleet, or run a repair shop, these Phoenix Systems dual-ended strips give quick diagnostics without lab gear. They’re ideal for owners who want documented, objective evidence before flushing brake fluid or coolant, for preventive maintenance programs, or for technicians who need a simple, reliable test to show customers why service is required.

Note: Always follow vehicle manufacturer instructions and safety precautions. Do not remove the radiator cap while the engine is hot. Dispose of used strips responsibly.