Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

This yellowish – and, by the way, poisonous and aggressive in relation to an autovarnish – a liquid does not corrode rubber and metal parts. It remains even at a minus 40°С more enough fluid, and its boiling point is located, despite the mentioned fluidity, on 260°С.

But the brake liquid possesses also one very unpleasant property: it easily absorbs water, it «гигроскопична». Water can really get to a brake liquid, for example through humidity of air: through a compensatory tank, and also microscopic not tight places on hoses of brake system and rubber cuffs. Full впитывание waters, however, does not lead to corrosion of metal parts of system, but to strong decrease in a boiling point. At only 2,5 % of the maintenance of water the boiling point is already only on 150°С.

It is dangerous at high loading on brakes because in this case they strongly heat up. Close разогретых brakes in a working liquid air vials can be formed. As air is compressed – the brake pedal will fail in a floor! In this case can help only fast «подкачивание» a brake pedal. Especially dangerously this effect is shown at braking of the car after strong loading on brakes. Because of absence blowing a counter stream elements of brakes heat up even more strongly; the greatest temperature is reached approximately after 15 mines of parking. Only after half an hour the temperature of a brake liquid again falls to the normal. Therefore the servicing plan профилактически orders replacement of a brake liquid each two years.

The brake liquid should correspond to standard FMVSS116DOT4. All liquids marked thus without fears can be mixed one with another.