Brake Design - Road Race
Brake Design - Road Race
(OP)
I am in need of basic brake layout design for road race car. Master cylinder size for front vrs. rear? Bias bar vrs. proportioner? looking for short throw/hard pedal and ability to adjust bias from front (dry track) to rear (wet track). I have master cylinders 5/8, 3/4 and 13/16 in hand. Also a hydraulic porportioner and a bias bar set up. Calipers are equal on all four corners. Smaller tires on front. Origional design information has been lost. Looking for where to start.





RE: Brake Design - Road Race
RE: Brake Design - Road Race
RE: Brake Design - Road Race
I didn’t really understand why you would want more rear braking in wet conditions.
RE: Brake Design - Road Race
There are more factors than the original poster has mentioned; center of gravity height and position being most significant. It's easiest to figure out graphically. To get an idea of the front/rear brake balance, draw a scale diagram showing the tire contact points with the center of gravity at the correct location with regards to its height and the fore/aft location in the wheelbase. Draw a line from the CG down to intersect the ground at an angle whose slope corresponds to the maximum expected deceleration G-force (e.g. if you expect 0.75 "g" deceleration then the slope has to be 0.75 inch/mm forward for each 1 inch/mm down - hard to explain in words but if you do the drawing it's easy to figure out). Where that intersects the ground, the inverse of the proportions of the lengths from that point to each tire contact patch gives you how much force is on each contact patch and that's the brake balance. Err a bit on the side of front, and there is your first-guess.
This does not account for aerodynamic effects, which can be significant on winged race cars at very high speeds. If the aerodynamics are right then there should be downforce on both the front and rear ...
RE: Brake Design - Road Race
Norm
RE: Brake Design - Road Race