MrVu

So my friend is offering me a pair of rare Alcon Brabus rear calipers for $300. Definitely a great price and hard to refuse the offer.



I know these will fit on our 300x22 rear rotors, but my biggest concern is the balance in the brake system.

Doing this will lead me to have 4 pot fronts and rears, and I'm hoping that the fronts are bigger still and will contribute to at least 70%+ of the stopping force.

What are your thoughts?

Thanks guys!

KJI3jflarryfe93

you can't have 4 pots on all 4 corners.
if you do a hard brake you will find out why it's dangerous with same size piston calipers in front and rear.
put 6 piston calipers in front go with 4 in the rear

Viper98912

What matters is the surface area of the pistons.

dsp_tdi

I have 4 piston rear calipers with slk55 rotor (13'') and not problem with stock front calipers. Just better brake balance

KJI3jflarryfe93

depends on how hard you brake in a traffic situation.
if a dangerous situation occurs you need to hit brakes hard car might spin 360 because of the even brake force.

there's a reason why manufacturers use less pistons in the rear than in front
4/2 - 6/4 etc etc

Viper98912

Has nothing to do with the number of pistons.

johnng117

I agree...
More pistons doesnt mean more braking force, its more evenly distributed... The size of the pistons are the main factor..
Think about it.. If you have a mini 6 pot at front and large 4 pot at rear the 4 pot may have a larger force.

dsp_tdi

2, 4 or 6 pistons are just for a better distribution on the pads, if you check the piston surface between 4 and 6 pistons (example front), they are very close. The biggest differences are the size of the brake pads and the size of the rotor. The power braking between 2 pistons vs 4 pistons are the same. If you want a car to make trail braking, you need more rear brake then stock. Stock brake ratio are conservative.

MrVu

Thanks for the information guys! I'm having my friend take more pictures of the calipers for me sometime today.

Just for clarifications, I am able to run it on my stock setup if I measure the diameters of the pistons? If the pistons on the alcon are bigger than the fronts, I should just avoid it?

Thanks guys!

Viper98912

You need to calculate the surface area of the stock pistons (which I think are 42mm) and the new one. If you have a significant change in rotor size, that as well.

I'll be honest - you need to do a lot more research about brakes and upgrades and calculations. This isn't something that you do easily, nor just make a bracket and pop them on. You realize that there's many ways to injure (kill) yourself, and more importantly, other people, by doing this if you don't know what you're doing?