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New Functional Fluids SAE Surface Vehicle Information Report J1709 (July 2006) describes the requirements according to DOT 3, DOT4, DOT 5 and DOT 5.1 for brake fluids. Parameters for brake fluids based on silicon esters are disclosed and it is stated that such "Silicon esters are similar in structure to borate esters". Typical silicon esters exhibit a dry ERBP of 310 °C, wet ERBP of 260 °C and a kinematic viscosity of 1350 mm2/s at -40 °C. The structure of such silicon esters is given in Figure 1 of this SAE Report and in fact according to Figure 1 the same glycol or glycol ether groups as in borate esters are shown for silicon esters. According to this Figure 1 the silicon esters bear two alkyl groups and two glycol or glycol ether groups or three alkyl groups and one glycol or glycol ether group. It is further pointed out that silicon esters are miscible with glycol ethers and such fluids are employed in racing. According to the Product Data Sheet e.g. brake fluid React SRF Racing by Castrol is a high performance brake fluid based on silicon esters with a high dry and wet boiling point. Such silicon esters and their use in hydraulic fluids or brake fluids are known from US 3814691 (Olin, 1974) or GB 1480738 (Castrol, 1977). Organosilanes of the above type can conveniently be prepared for example, by reacting an alkyl-halo-silane with polyalkylene glycol monoalkyl or monoaryl ethers in an inert medium (US 3814691). Further to the silicon esters bearing two alkyl groups and two glycol or glycol ether groups or three alkyl groups and one glycol or glycol ether group of Figure 1 of the above-mentioned SAE Report both US 3814691 (Olin, 1974) and GB 1480738 (Castrol, 1977) further disclose silicon esters bearing one alkyl group and three glycol or glycol ether groups. US 6,558,569 B1 (Union Carbide, 2003) describes low viscosity functional fluids based on certain alkoxy glycol borate esters and alkoxy glycols. Since the above-mentioned SAE Report states that silicon esters are similar in structure to borate esters this document discloses silicon esters corresponding to the borate esters of US 6,558,569 B1. The functional fluids according to US 6,558,569 B1 use triethylene glycol monoalkyl ethers as main constituents of alkoxy glycol borate esters and alkoxy glycols. This is in co...