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Re: [T3] Converting Single MC to Dual MC

>The proportioning is done in the design stage of the car, by choosing what 
>diameters of slave pistons you use AND at what radius the braking force is 

Actually, we often use an adjustable proportioning valve during the
development of the braking system.  This lets us tune the front/rear brake
bias as the suspension is tuned and the weight of the car is still moving
around some.  Once the development engineer is happy with the brake
performance the rest of the vehicle design is settled in the final
proportioning is measured and then a fixed proportioning valve is designed
for the production cars.  

Most of the new cars have proportioning valves in them since it allows use
of common brake parts across cars with different weight bias and lets the
longer lead time components (rotors and calipers and knuckles) to be
finalized and tooled early in the development.  The system is then fine
tuned with the proportioning valve.

>BTW, I'm not sure exactly what the advantages of disk brakes are (maybe it's 
>unsprung weight,) but I don't think its accurate to say that drums are less 

While unsprung weight is an advantage of the disc brakes, I believe the real
advantage is in performance.  Disc brakes shed heat much better than drum
brakes and suffer less brake fade (reduce performance) under repeated hard
braking and perform better when wet.   There are other advantages in terms
of servicablility and cost as well.

John Jaranson
'71 FI AT Fasty (Jane - Darkside Project)
'66 Square (Sophy - Daily Driver)
About Half a Late Square (Organ Donor)

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