Black-Black M5 said:Im posting this question for a freind of mine who wanted to know how good stop tech's are for hard driving and track use. I believe he just bought a 4 wheel stop tech brake system for his M5. Thanks in adavance for the info
With the early M5 kits, StopTech had the bridge allen screws removeable from the inside - and the lower screw hit the steering arm. The result was that the caliper had to be removed from its mounting to allow pad changes. Later M5 BBKs - either all of them or if you requested this from StopTech (I'm unsure which) - had the front caliper bridge screws reversed so the bridge could be removed without removing the caliper from its mount. My car has an early kit, so I reversed the lower screw on each front caliper. This required machining a threaded insert to fit the inside half (where the allen screw head recess is located), and drilling out the threaded insert and spot-facing a screw head recess on the outside. Being paranoid, I also safety wire the reversed screw. This setup has worked for me without any trouble.Redshift said:I also use the StopTech front BBK on my M5 for extensive track use and have had similar comments made about the incredible braking ability of my 4000lb beast. Except for all-out race cars, there is hardly ever a car that can out-brake me even at very high speeds. The difference is night and day compared to the original brakes.
Dick, what is the "outside lower bridge bolt" modification? I always have a bear of a time removing that stupid bridge and as a result, my caliper's black finish is scratched and chipped from several fouled attempts. In fact, I think I need to re-build my calipers as the dust boots are dried and cracked and the paint finish is not in good shape.
I think anyone with a newer StopTech kit owes Dave Zeckhausen a debt of gratitude for recommending this design change! Of course, it does Dick and me little good now, but at least Dick has engineered a fix. I, on the other hand, have to remove one caliper mounting bolt and loosen the other in order to pivot the caliper and change pads. Every time!RRoberts said:Later M5 BBKs - either all of them or if you requested this from StopTech (I'm unsure which) - had the front caliper bridge screws reversed so the bridge could be removed without removing the caliper from its mount.
This press release should answer your question. http://www.stoptech.com/press_releases/laguna_wins.htmBlack M5 said:Im posting this question for a freind of mine who wanted to know how good stop tech's are for hard driving and track use. I believe he just bought a 4 wheel stop tech brake system for his M5. Thanks in adavance for the info
Regardless of how many times you track per year, the Performance Friction 01 pads are the ones I strongly recommend. Of all the pads I support, this one results in the most positive customer feedback and the least number of judder complaints. Very good cold bite, so you can run them at the track when the ambient temperature dips below 40 degrees. Some other pads, like the Cobalt Friction Spec VR, have trouble when it's that cool. The torque curver is flatter than PFC97 and it has a maximum operating temperature you will not exceed with StopTech brakes. PFC97 pads will last longer, but the lower bite and more variability in torque across the temperature range make it somewhat less desirable. If you were running an event every weekend, you might use the PFC97 to save money, but with only two track events/year the PFC01 pads are ideal.foxyboym5 said:Can someone recommend a set of track pads to be used with these?
I track around only twice a year, so changing shouldn't be an issue.
I believe the kit comes with Axxis Ultimates, which i presume are good for the road, but what track ones do u use/recommend.
I can always send you a set, if you need them. But shipping to the UK costs $48 for a set of pads, so you should try looking for a local source first. Of course, the relative weakness of the US dollar to the pound sterling might offset that.foxyboym5 said:Brilliant, thanks Dave. Are these available in the UK? If not, not sure if u can supply?
Yes. There are many reasons for picking a certain number of pistons for a particular application. In general, a 6 piston caliper will not be as stiff as a 4 piston caliper. (You can see this effect in the caliper deflection charts here: http://www.stoptech.com/technical/caliperdeflectionchart.htm) So that translates into softer pedal feel. In order to accomodate more pistons without compromising stiffness, one needs to add bulk to the caliper and that impacts which wheels it will fit under. And the manufacturing cost is a consideration if you want your kit to reach a certain price point. More pistons means more materials, pistons, seals, dust boots, and greater assembly costs.rogbacon said:Dave, in your expert opinion is there any reason Stoptech went with 4-pots rather than 6 (or even 8 as in the case of the top Brembo kits)??
DZeckhausen said:StopTech has created a HUGE billet 8-piston caliper for the Hummer and other oversized SUVs. You won't see this caliper offered for the M5! It's simply not appropriate.
To give you a sense of scale, that small looking rotor is 380mm (15") in diameter!