Johnsen's DOT-4 Brake Fluid 1 Gallon — Premium Synthetic, High Boiling Point & ABS Safe

Johnsen's 5034 is a premium synthetic DOT-4 brake fluid in a one-gallon container engineered to deliver high boiling resistance and reliable performance in disc, drum and ABS systems.

This one-gallon bottle of Johnsen's 5034 DOT-4 brake fluid is formulated to meet and exceed DOT 3 and DOT 4 specifications while offering extra protection against moisture uptake and vapor lock. It’s designed for modern hydraulic braking systems where higher boiling points and stable pressure transmission matter — including vehicles equipped with anti-lock braking systems. The synthetic base and additive package help maintain braking responsiveness under repeated stops and elevated temperatures.

How does Johnsen's 5034 protect against vapor lock and moisture?

The fluid contains specialized additives that reduce the effects of moisture absorption and raise the wet and dry boiling points. That lowers the chance of vapor formation under heavy braking and preserves pedal feel over time. Regular fluid maintenance combined with this formulation helps limit internal corrosion and preserve system performance.

• Special additives to reduce vapor formation and gas bubbles
• Improved resistance to moisture-related boiling point reduction
• Helps minimize internal corrosion in hydraulic lines and components

Will this brake fluid work with my ABS, disc, or drum brakes?

Yes — Johnsen's 5034 is suitable for disc, drum and ABS hydraulic systems. It’s formulated to meet the compatibility needs of modern braking components and the tighter tolerances of ABS modulators. Use it in systems that call for DOT 4 or DOT 3 flu ids, but always follow your vehicle manufacturer’s specification before topping up or replacing fluid.

• Compatible with ABS modulators and valves
• Appropriate for both disc and drum brake circuits
• Meets or exceeds DOT 3 and DOT 4 requirements for broad compatibility

How should I use and store this one-gallon container?

Use clean tools and follow standard procedures when bleeding or topping brake systems to avoid contamination. Keep the container sealed when not in use and store it in a cool, dry place away from direct sunlight. Replace brake fluid according to your vehicle maker’s intervals or when moisture content or boiling performance declines.

• Keep the cap tightly closed to limit moisture exposure
• Store upright in a cool, ventilated area away from heat sources
• Follow vehicle manufacturer guidelines for fluid change intervals

What performance benefits can I expect from DOT-4 over DOT-3?

DOT-4 fluids generally have higher dry and wet boiling points than DOT-3, providing better resistance to fade under heavy braking. Johnsen's 5034 builds on that with synthetic base stocks and anti-corrosion additives for more consistent pedal feel and longevity. For heavier vehicles or performance driving, the extra margin against boiling is especially helpful.

• Higher boiling point for reduced brake fade during repeated stops
• Synthetic formulation for stable viscosity across temperatures
• Enhanced additive package for corrosion control and system protection

Who is this for? Johnsen's 5034 Premium Synthetic DOT-4 Brake Fluid is aimed at DIY mechanics, professional technicians and vehicle owners who need a full-gallon supply for maintenance, fleet servicing or multiple vehicles. It’s a practical choice when your vehicle calls for DOT 4 (or accepts DOT 3) and you want a synthetic, higher-boiling fluid that helps protect ABS systems, discs and drums. Always confirm your vehicle’s recommended brake fluid specification before use and observe safe fluid-handling practices.