Not only is it not advocated, NEVER pre-load the brake or brake booster. Reduce the free play if you desire, but do not reduce it to zero (or less with a pre-load). The brake master/booster must release completely to open the passage between the master cylinder and the reservoir. Without that being open when the brakes are off, you are asking for trouble. As the brakes wear, the caliper pistons mover closer to the rotors - this is accommodated by additional fluid being drawn into the brake system from the reservoir. It's only possible when the brakes are completely released opening the passage to the reservoir. More importantly, as the brake fluid warms up, it expands and builds up pressure in the brake system. This "expanded" fluid exits the brake system back into the reservoir. If the brakes are "pre-loaded", the fluid cannot be released, so the pressure builds up in the brake system and causes the brakes to drag, which in turn overheats them - besides increased wear, it lowers the effectiveness of the brakes.Elise 323 said:Not that anyone would advocate such action, but a tiny amount of pre-load on the brake booster has an appreciable effect but is not safe to do according to the Lotus service instructions :no: .
Never remove all the play in the brake pedal linkage and never, ever "pre-load" them. :no: