The calculated number shows the bias "under full braking", for the highest deceleration possible with the current vehicle setup, on clean and dry tarmac or concrete, with the tires working at their advertised friction coefficient. Tools and Pit Equip. Dry Disc Temperature Rise. For exceptions, click here. Rotor OD and pad Cf can also effect the amount of pressure required for the final torque value. The calculator will demonstrate how a change in piston size can effect the required LEG input to get the Rotor Torque desired. The brake bias of a car can be affected by aerodynamic elements, modifying the center of gravity, different piston caliper diameters, brake pad friction coefficient, brake rotor diameter, and … production pads are generally in the 1.500" range. The significant benefit to this set-up is that a bias bar can be designed in such a way that the driver can adjust the front-to-rear proportioning ratio while at speed. By calculating the area in inches squared (bore x bore x.785”) for any master cylinder size, you can calculate how much pressure change would be affected by a bore size change. - Friction of brake pads This "need" for a different bias on different surface conditions, is the reason why most race cars have an adjustable balance bar between both master cylinders, an adjustable proportioning valve, or both. The MOT testing service will automatically calculate brake efficiency and out of balance results. REAR production pads are generally in the 1.500" range. A 7/8” bore master cylinder has a bore area of.6” inches squared. Piston 2- The second piston on one side of a caliper. Race Brake Actuation System Set Up. The bias calculator expresses final bias as tire torque at the ground. A balanced braking setup is critical to the car’s performance on track. While Bias is important, you can also see the cause and effect of other elements of your proposed changes. When shopping BBKs suppliers should be willing to give you the data here openly. done for two configurations i.e. For 20 kg force, the Brake Pressure values in … See also: Dynamic Weight Distribution. If you have more front brake you will be tighter going into turns, and if you have more rear brake you will be looser going into turns. Using the bias calculator is simple; It's a 'plug and play' tool for your use. This includes things such as the pedal dimensions, piston sizes, rotor diameter and … - Location of center of aerodynamic downforce Should you choose to run much less piston area you can calculate the required increase in Leg necessary to generate the same final value. On the other hand you may wish to see what a smaller MC will do in the same instance to boost Rotor Toque. XBOX GT: thetimeofthe9. This accounts for the floating aspect of the single piston caliper. When rotor torque is expressed it is yet again a ratio of the tire in which it is functioning. **Pad Radial Height- This is the height of the pad friction material. So to adjust how much brake will be applied at the front compared to the rear, a brake bias valve is used. The values of a number of factors can be changed including rotor diameter, piston areas, pad Cf, input pressure and master cylinder bore size. It is also known as a proportioning valve. yep .. hard braking -> more weight on front - if you have brake bias too much on rear that is now lighter, rear tyres will lock more easily (less weight means less power needed to stop it) -> rear will loose traction -> oversteer. Brake bias – Indicated as a percentage. where you need to brake but don't need to brake to hard and would like to keep some speed and momentum going moving the brake bias more to the back would be better. This calculator is intended to calculate a lever ratio based on a desired system pressure and pressure on the lever. See how Calculating the Right Brake Pedal Ratio is made easy. Simply how much of the braking pressure is at the front vs the rear? Why does my bias percentage shown not represent the rotor torque values to the same percent? A six pot caliper would be 1.625/1.125/1.125" for example. Brake Balance(or Brake Bias) refers to brake torqueat the front wheels as a percentage of total brake torque. User Info: barrysshoes. March 8, 2021. your online source for diffusers, jacks, wing end plates, camber adjusters, and more. VAT: £138.60 Add to Basket In the brake bias calculator you will need the dimensions of many of the components of your current or desired brake system. Assuming a 70/30 bias split, Volvo 4 pots and 260mm discs, a 2.8% (4*0.7)pedal effort reduction will be realized with 260mm discs over std Dia. Brake System Analysis: Pedal Force : Total Brake Force : Front Brake Force : Acceleration : Brake Distance : Stopping Distance : Load Transfer : Dynamic Front Load : Dynamic Rear Load : Dynamic Weight Distribution : Un-proportioned torque bias : Pedal Travel : System gain : 'Mush factor' : Dynamic Bias : For chicanes etc. E.g. By default the calculator assumes the same size tire is used front and rear. Changing the size of the tire from one end of the car to the other will effect tire torque just as changing rotor size does to rotor torque. Update: Calculator with latest equations and data (Courtesy of CLAWHAMM3R on m3forum) Brake Bias on E46 M3 with MK60-based Master Cylinder (Front: 25mm, Rear: 22mm) (post-09/2002) (1:54.1 Stock Bias – 60.6%F 39.4%R) Brake Bias on E46 M3 with DSC3-based Master Cylinder Pressure Rear: psi Usually one cylinder feeds the front brakes and the other the rear brakes. - Total-caliper-piston-area per axle. Vehicle dynamics calculators. There are many variables which can be used to alter the final results. Finally is the last and most important part – the brake bias and balance bar setup!! For example, if a driver is strong enough to press with 100 lbs.