Can i use car brake fluid in the braking system

I would say ‘yes’, even though good traction is determined by several factors and does not depend on the axle alone. The goal is to have the tyres at the right temperature: a soft axle warms the tyres up more slowly, meaning that during a race there is less grip initially, but there are advantages towards the end, when the tyres reach the correct temperature. Conversely, a hard axle warms tyres up more quickly, providing greater grip at the start of a race and perhaps less towards the end, when the tyres overheat. The secret is maintaining the tyres as constant as possible in the correct range of operating temperatures by choosing axle hardness also on the basis of the track’s grip.