Your source for VW
Parts & Accessories

Bosch ESI6 Extended Service Brake Fluid

Bosch ESI632N - 139668

Item Number
Mfr Part Number
Product Group
Oil, fluids & chemicals
OE References
OE Fluids XREF - DOT5, DOT4

Product Description

Brake fluid is unique among the different lubricants/hydraulic fluids in use in automobiles for one very particular reason: it's not oil based. DOT-3, -4, and -5.1 brake fluids are glycol based, and their hygroscopic nature to absorb water prevents any water that sneaks in via damaged seals from pooling in the low points of the system, where it could rust, freeze, or boil off.

This hygroscopic sword cuts two ways, however: brake fluid absorbs moisture from the surrounding air over time, and as the water content of brake fluid increases, its corrosion protection and boiling point/temperature resistance both fall off. Automakers thus suggest regularly flushing your brake system to maintain brake performance and prevent internal corrosion, and we've found flushing every two years or so is one of the most effective things you can do to extend the life of your brake system.

Modern brake systems, such as those featuring ABS and ESP®, are designed for improved performance to safely stop vehicles. With improved performance comes a higher load on the braking systems. These systems require a brake fluid with a high wet boiling point, low viscosity, and high lubricity.

As a vehicle system developer and the first to market ABS and inventor of ESP®, Bosch understands the need for a high quality brake fluid, and their ESI6 fluid is one of the best we've encountered. It exceeds all current DOT standard requirements (FMVSS 116), making it the best value on the shelf:

  • First to simultaneously combine both low viscosity and high wet boiling point at its operation
  • Longer lasting: 100% longer than DOT 3, 50% longer than DOT 4, and 10% longer than DOT 5.1 (with 30% lower viscosity)
  • ESI coverage includes the majority of all brake systems launched since 1990; Use with DOT 3, DOT 4, or DOT 5.1; Coverage excludes DOT 5 silicone based brake fluid which is limited to military and racing applications
  • Excellent lubricity properties to prevent wear of components in the brake system and reduce noise
  • One size fits all: As Bosch ESI6 can be used to substitute almost all previously used brake fluids, e.g. DOT 3, DOT 4, DOT 5.1 (except LHM), it fits practically any brake system launched since 1990.
  • Bosch ESI6 helps reduce the stock of brake fluids thus saving storage space.
  • Featuring replacement intervals of 3 years, Bosch ESI6 high-grade brake fluids last much longer than standard DOT 3 brake fluids (to be replaced every year and a half).
  • Bosch ESI6 reduces corrosion within the brake system and its high lubricity prevents noises and wear inside ABS and ESP® systems.

About Bosch

Bosch is a trusted world-renowned original equipment manufacturer (OEM) and parts supplier for almost every major manufacturer. WPD carries a wide variety of Bosch VW Parts branded parts for VWs including ignition coils, distributor caps and rotors, spark plugs, rebuilt distributors, and other ignition and electrical sensor products.

Bosch is a trusted source by many vehicle manufacturers, including VW, and others for their superior quality to other OEM suppliers and their long history or excellence. Bosch is the largest automotive parts organization in the world and is OEM to many of the top European, Domestic and Asian manufacturers.

Bosch earned its name and reputation in the industry by being the top source for engine management components such as ECU’s, starters, alternators, plugs, spark plugs, electrical components, oxygen sensors, fuel delivery parts and injection components. Along with those OEM and OES products they also have complete aftermarket programs in automotive filtration, brakes, HVAC management, along with a multitude of other programs.

Show me more products from Bosch

Shipping Estimate

Product Reviews

Policies, Warranty & FAQ