Is the migration exactly the same when the car is in the pits compared to when on the track with hot brakes?boxermotor wrote:The migration is clearly visible also when the car is standing in the pits: the bias is fairly consistent through the "pressure ramp" phase. Then during release, the rear master cyl returns quicker than the front. The bias moves to the front causing front wheel locking at medium to low speed.
Is the migration smaller with the master cylinders being of the same size?boxermotor wrote:The front master cylinder is usually smaller than the rear in order to get the bias adjustability range right, although there is still migration even with frt and rr master cyl the same size.
You should check all factors that hinder the master cylinder to return quickly to the starting position. Can the brake pads move freely in the calipers? What are the differences (length and diameter of the hoses, radius of the hoses when they have to change orientation) in the front and rear brake circuit that could cause the different pressures in the release phase?boxermotor wrote:New discs/pads reduce pedal travel hence migration. Worn brakes increase pedal travel hence migration gets worse. New discs front and "bad" discs rear require more bias to the rear and migration is slightly reduced. As a general rule, the more bias to the front, the worse the migration.
The car is a... single seater with a 3.5 engine
Which parts of the brake circuits have you replaced to check if they reduce the migration?
Do other contenders in this series that use the same brake system suffer the same problems?
Try make a sketch of the front and rear brake circuit from the pads to the fluid reservoir and think about every single part what can hinder the pressure to decrease.
so the brake system is spec? had to believe youd be the only car/team suffering if so. what kid of fluid, what kind of pads, what are the brake lines like, i like equal lengt systems f/r did you say youre compensating for the lengths of front rear being different with the different master cylinders then i take it.. any residual pressure valves? are the front calipes getting bled poperly lol