Phoenix Systems 500 Double-Ended Brake & Coolant Test Strips — Quick, Repeatable Corrosion and pH/Glycol Readings

Phoenix Systems 500 Double-Ended Brake & Coolant Test Strips are a two-in-one diagnostic strip that quickly reveals brake-fluid corrosion and coolant pH/glycol levels in about a minute.

Stop guessing when to replace brake fluid or antifreeze. These double-ended strips give visual, repeatable results for both brake fluid corrosion and coolant condition so you can make an informed maintenance decision. They are compatible with DOT 3, 4, and 5.1 brake fluids (including synthetic, low-viscosity, HOAT and OAT formulas) and with all coolant colors and formulations.

How do these strips show brake fluid condition?

Dip the brake-fluid end into the master-cylinder reservoir after removing the cap (engine off). The test pad reacts to corrosion agents: the white pad changes toward purple in proportion to corrosion level, giving an immediate visual indication of fluid degradation.

• Color shift from white to purple indicates increased corrosion.
• Results visible in as little as 60–90 seconds.
• Works with DOT 3, 4, and 5.1 fluids, including synthetic blends.
• Repeatable visual evidence you can photograph or keep for records.

What does the coolant end test for, and what do the colors mean?

The coolant end has two reactive pads: one measures glycol concentration and the other measures pH. Glycol color varies from pink to red/blue depending on percentage, while the pH pad ranges from orange through yellow/green to indicate acidity or alkalinity.

• Glycol indicator shows if antifreeze concentration is low and needs topping or replacing.
• pH indicator identifies acidic coolant (below pH 7) that promotes corrosion.
• Helps prevent freeze-related damage and corrosion of pumps, radiators, and heater cores.
• Safe, quick dip in the radiator or overflow tank (do not open a hot radiator).

How fast and reliable are the Phoenix Systems test strips?

These strips deliver clear, repeatable readings in a short time—typically under 90 seconds—so you can decide whether maintenance is needed without expensive lab tests. The visual color changes are designed to correlate with known chemical markers used by mechanics and service technicians.

• Most readings complete within one to one-and-a-half minutes.
• Easy-to-interpret color shifts for common service decisions.
• Pack of 100 double-ended strips provides many tests for fleet or home use.
• Reduces the need to rely solely on shop recommendations.

How should I use and store these test strips safely?

Use the brake-fluid end in the brake master cylinder and the coolant end in the radiator or coolant reservoir when the engine is cool. Keep strips dry and sealed until use, avoid contaminating pads, and follow standard safety practices when opening fluid reservoirs.

• Do not open the radiator cap while the engine is hot—wait for cooling.
• Store strips in a dry, room-temperature environment away from direct sunlight.
• Handle by the nonreactive end to avoid influencing test pads.
• Discard used strips; one-use only for accurate readings.

Who is this for? Phoenix Systems 500 Double-Ended Brake & Coolant Test Strips are ideal for DIY mechanics, professional technicians, fleet managers, and anyone who wants objective proof of fluid condition before committing to service. If you perform regular vehicle maintenance, manage multiple vehicles, or simply prefer to verify a shop’s recommendation, these strips deliver fast, visual data to guide brake-fluid and coolant care without guesswork.

Features:

• 100 double-ended brake fluid + coolant test strips for diagnosing when to change brake fluid and engine coolant
• Compatible with all coolant colors and DOT 3, 4, and 5.1 brake fluids including synthetics, low viscosity, HOAT and OAT
• Finds worn out brake fluid and coolant fast. In as little as 90 seconds.
• Provides visual, repeatable, scientific proof of when to change or not change brake fluid and coolant (anti-freeze)
• The most trusted, reliable and accurate test for the condition of brake fluid and coolant