4 pot versus 6 pot calipers

D-CEL · #1 (**permalink**) 05-02-2007, 05:14 PM

Ant,

Wilwood now has a hydo-mech rear caliper as you are describing. They call it the "Combination Parking Brake Caliper"

Here is a link: http://www.wilwood.com/Products/001-...-cpb/index.asp

The only problem I have found with this type of rear caliper is its lack of mass and surface area. In a Hi-perf/track application, you must run a lot of front bias in the system to keep the rears from boiling out the fluid.
This is a common problem on early Vipers. When the owner does a pad-line upgrade (which they desperately need) The rears get hot so fast that they boil the fluid, burn the seals. Then fluid squirts onto the red hot rotor and bursts into flames!!
Cars with good rear weight bias (Cobras &Vipers) benefit from a little more rear caliper. I like 1” bore Dynalites or NDL’s and then use the Combo caliper as the P-brake only.

Jason

Ant · #2 (**permalink**) 05-02-2007, 05:46 PM

Jason,

Thats the thing with these cars and they need good rear brakes, also the more calipers on the rotor the less air around it for cooling. With the handbrake I can get dispensation for a hydraulic handbrake while I own the car, which maybe a way around it!

The Dynalites with 1" bores seem to be popular with a lot of race guys here for the rears. I have also seen very good Jap hi-performance 2 pot calipers grafted into setups, and as mentioned one piece ventilated rotors 11" & 12" available in different offsets here for $60-$80, we have guys here that have built some of the fastest race cars in NZ with a very simple rear common setup, but I as you mentioned there is potential for uneven pad wear with less than 2 pot calipers.