Dot 5 Et Corrosion

[SaintAndré]

En réponse à une question de Petrus Seven jepost ici un article bien fait sur les histoires de CORROSION et de DOT5 :

Article

SaintAndré

[PetruSeven]

<!--emo&-->[img]http://www.forum-autoroule.com/html/emoticons/jap.gif' border='0' style='vertical-align:middle' alt='jap.gif' /><!--endemo--> SaintAndré.
Pas de pb. de corrosion avec le DOT5.1 <!--emo&-->[img]http://www.forum-autoroule.com/html/emoticons/bien.gif' border='0' style='vertical-align:middle' alt='bien.gif' /><!--endemo-->

<i>DOT5.1
DOT5.1 is a relatively new brake fluid that is causing no end of confusion among mechanics. The DOT could avoid a lot of confusion by giving this new fluid a different designation. The 5.1 designation could lead one to believe that it's a modification of silicone-based DOT 5 brake fluid. Calling it 4.1 or 6 might have been more appropriate since it is closer to DOT3 or DOT4 formulations than silicone-based DOT 5 fluid. (In fact, Spectro is marketing a similar new fluid which they are calling Supreme DOT 4, which seems less confusing.)
As far as the basic behavior of 5.1 fluids, they are much like "high performance" DOT4 fluids, rather than traditional DOT5 brake fluids.
Advantages:
DOT5.1 provides superior performance over the other brake fluids discussed here. It has a higher boiling point, either dry or wet, than DOT 3 or 4. In fact, its dry boiling point (about 275 degrees C) is almost as high as racing fluid (about 300 degrees C) and 5.1's wet boiling point (about 175 to 200 degrees C) is naturally much higher than racing's (about 145 C).
DOT5.1 is said to be compatible with all rubber formulations.
Disadvantages:
DOT5.1 fluids (and Spectro's Supreme DOT4) are non-silicone fluids and will absorb water.
DOT5.1 fluids, like DOT3 & DOT4 will eat paint.
DOT 5.1 fluids are difficult to find for sale, typically at very few auto parts stores, mostly limited to "speed shops."
DOT 5.1 will be more expensive than DOT3 or DOT4, and more difficult to find.</i>

A noter que les peintures modernes de carrosserie, notamment métallisée (vernis polyurethane) ne me semblent plus endommagées par le DOT 5.1

Donc à recommander car point d'ébullition élévé même quand il est un peu usagé (ce qui n'est pas le cas des liquides Racing qui doivent donc être vidangés très souvent).