Press release #Automotive Aftermarket

High reliability, increased service intervals

Developed and tested to meet the requirements of modern and future brake systems: new Bosch ENV4 and ENV6 brake fluids

  • New brake fluids meet current and future standards
  • ENV4 and ENV6 combine a high wet boiling point with a low viscosity
  • Increased service interval for brake fluid ENV6
Heiderose Dreiner

Heiderose Dreiner >


Modern brake systems are becoming more and more powerful while the reaction times of ABS and ESP® are getting shorter. Therefore, the requirements on brake fluids are becoming tougher and tougher. The new Bosch brake fluids ENV4 and the high-performance version ENV6 ensure modern brake systems provide top performance at all times. This is mainly achieved by the lower viscosity and the higher wet boiling point in comparison with DOT-standard brake fluids. The high lubricity of Bosch ENV6 minimizes both noises and wear inside ABS and ESP® systems. Additionally, the newly developed brake fluids reduce corrosion within brake systems.

The very good technical characteristics of the new brake fluids allow for significantly increased service intervals for ENV6. Standard DOT4 brake fluids need to be replaced every two years. ENV6, however, features a three-year replacement interval.

Another advantage is the new brake fluid’s downward compatibility for ENV6. It can be used for all brake systems built since 1990 which use typical polyglycol-based brake fluids. Systems working with LHM brake fluids – based on mineral oils - or containing silicones (DOT5) are the only ones excluded.

For increased safety: lower viscosity, higher wet boiling point

To a large extend, the ESP® reaction times depend on the viscosity of the brake fluid. The lower this value, the shorter the ESP® reaction time. With the new ENV brake fluids, the viscosity was improved by an average of 9 percent in comparison with low-viscosity DOT4 brake fluids – achieving values below 700 mm²/s.

Their high wet boiling point is yet another quality feature. The higher it is, the lower is the risk of formation of vapor bubbles within the brake system – the main cause of brake failure. The new Bosch ENV6 brake fluid features an enhanced wet boiling point of up to 185 degrees Celsius. In consequence ENV6 ensures road users up to 50% more safety through a lower risk of vapor lock. ENV4 exceeds with 175 degrees Celsius DOT4 standard requirements. Both of these characteristics, i.e. high wet boiling point and low viscosity, improve both safety and reliability of brake systems. Bosch also illustrates the new brake fluids’ high quality by means of the packaging design: ENV4 and ENV6 form part of the so-called black line representing particularly high-grade products.

Sophisticated tests at the Bosch test center

The experts at the Bosch test center in Abstatt (Germany) subjected the new brake fluids ENV4 and the high-performance version ENV6 to extensive tests making them perfectly suitable for use in current and future ABS and ESP® systems. Sophisticated test procedures like system pressure build-up, wear and noise generation as well as the application under extreme temperature conditions were analyzed putting the new brake fluids under extreme strains. As a result, ENV4 complies with all current standards requested by car manufacturers. ENV6 (ENV for ENVelop) meets all actual standards such as DOT3, DOT4, DOT5.1, ISO Class 6 and the requirements of all major vehicle manufacturers. By using modern driver assistance systems future brake systems will be affected by higher requirements. The new ENV brake fluids support their functionality even today. Additional benefit for workshops: The new Bosch brake fluids are no dangerous substances as specified by the Ordinance on Hazardous Substances.

The Automotive Aftermarket division (AA) provides the aftermarket and repair shops worldwide with modern diagnostic and repair shop equipment and a wide range of spare parts – from new and exchange parts to repair solutions – for passenger cars and commercial vehicles. Its product portfolio includes products made as Bosch original equipment, products developed in-house and specifically manufactured for the aftermarket, as well as services. About 13,000 associates in more than 150 countries, as well as a global logistics network, ensure that spare parts reach customers quickly and on time. AA supplies testing and repair-shop technology, diagnostic software, service training, and information services. In addition, the division is responsible for the “Bosch Service” repair-shop franchise, one of the world’s largest independent chains of repair-shops, with some 15,000 workshops, and more than 1,000 “AutoCrew” partners.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 402,600 associates worldwide (as of December 31, 2021). The company generated sales of 78.7 billion euros in 2021. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT provider, Bosch offers innovative solutions for smart homes, Industry 4.0, and connected mobility. Bosch is pursuing a vision of mobility that is sustainable, safe, and exciting. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to facilitate connected living with products and solutions that either contain artificial intelligence (AI) or have been developed or manufactured with its help. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. With its more than 400 locations worldwide, the Bosch Group has been carbon neutral since the first quarter of 2020. The basis for the company’s future growth is its innovative strength. At 128 locations across the globe, Bosch employs some 76,100 associates in research and development, of which more than 38,000 are software engineers.

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