Phoenix Systems 15-Pack Double-Ended Brake Fluid & Coolant Test Strips, Dual-End 60–90s Corrosion & Glycol/pH

Phoenix Systems 15-pack double-ended test strips let you check brake fluid corrosion and coolant glycol/pH in about 60–90 seconds without tools.

These dual-ended strips combine a brake-fluid corrosion indicator on one end and coolant glycol/pH pads on the other, giving you fast, repeatable evidence about two critical vehicle fluids. Each foil-wrapped strip is designed for single use: dip the brake end into the master cylinder reservoir and the coolant end into the radiator/expansion tank (only when cool and diluted as installed). The color changes are easy to compare to provided reference charts, helping you decide whether maintenance is needed.

How do these strips reveal brake fluid condition?

The brake end contains a corrosion-reactive pad that shifts from white toward purple as iron and other corrosive byproducts rise. The intensity of color change corresponds to the level of corrosion present in the fluid, offering a quick visual measure of fluid degradation.

• Dip into the brake master cylinder reservoir—observe within 60–90 seconds.
• Color shift indicates increasing corrosion; darker purple = more corrosion.
• Single-use, foil-sealed for shelf stability and contamination prevention.
• Recommended testing interval aligns with manufacturer guidance; Tesla recommends similar strip testing every two years for brake systems.

What do the coolant pads test and why does that matter?

The coolant end contains two pads: one that responds to glycol concentration and another that indicates pH (acid/alkaline). Together they show whether the coolant has adequate antifreeze protection and whether it has become acidic—both important for preventing corrosion and freeze/overheat risk.

• Glycol pad color varies by percentage—helps verify proper 50/50 dilution in system.
• pH pad moves from orange to yellow/green; pH below 7 suggests acidity that can corrode components.
• Always test coolant as it exists in the vehicle (do not test full concentrate).
• Results available in about a minute—quick field check before long trips or service visits.

How should I use the strips safely and accurately?

Follow simple precautions: only open caps when the engine is cool, test coolant at the system’s normal dilution, and compare colors to the supplied chart under good light. Proper technique reduces false readings and protects you from burns or contamination.

• Do not remove radiator cap if the engine or system is hot—wait until cool.
• Test coolant in the vehicle at operating dilution (typically 50/50); do not test undiluted concentrate.
• Use each foil-sealed strip once; discard after testing to avoid cross-contamination.
• Store unopened strips dry at room temperature for reliable performance.

Who is this product for? These test strips are ideal for DIY vehicle owners, independent mechanics, fleet managers, and anyone who wants objective proof of fluid condition before paying for service. They give a fast, low-cost way to spot corrosive brake fluid or low glycol/acidic coolant that can cause component wear, letting you make informed maintenance decisions and avoid unnecessary service charges. Use them as routine checkpoints or when suspecting system issues—paired with manufacturer guidance, they help you prioritize professional service when needed.