G-Loc™ Performance Brakes does not sell silicone brake fluids nor recommends their use with any braking system.

Virtually all of the problems with silicone brake fluids reflect certain properties of silicone fluids identified by us over many years and recently ratified in SAE publications, specifically: high ambient viscosity; high air absorption; high compressibility; low lubricity; and immiscibility with water. Research has shown that these properties of silicone fluid result three performance problems:

Long Pedal Travel or “Spongy” Pedal caused by:

1. High compressibility, up to three times that of glycol based fluids;
2. High viscosity, twice that of glycol based fluids, leading to slow rates of fill and retention of free air entrapped during filling, and hence bleeding difficulties.

A Sudden Loss of Braking resulting from:

1. Air absorption – gasification of absorbed air at relatively low temperature produces vapor lock effect;
2. Immiscibility (failure to mix) with water – whilst the presence of dissolved water will reduce the boiling point of glycol based fluids, any free water in silicone-filled systems will boil and produce vapor lock at much lower temperatures (100°C or thereabouts)

“Hanging On” of brakes due to:

1. Low lubricity – in disc brake systems the sole mechanism for normalization of system pressure upon release of pedal pressure is a designed-in tendency of seals to recover to their ‘at rest’ attitude. Low lubricity works against this tendency.
2. High viscosity exacerbates the effects of low lubricity.  The high price of silicone fluids does not produce higher performance in hard driving or even normal road use.