My M5 is now reaching 200 000km and I have decided to mark this occasion with a present: Stoptech ST-40 Front BBK.
I was never happy with the OEM brake setup, even when trying multiple pads like Axxis ULTs, EBC Red Stuff or the OEM Textar stuff. They do brake just fine three or four times hard, but then they fade easily and it just becomes hard to modulate the braking. They are uninspiring if you try to tackle a challenging mountain road or more than a lap at the time at the Ring.
Add to this that my OEM brake setup started giving me problems. Despite the piston not showing any rust after lifting the seal, it was warping my discs. I already had my discs turned and fixed, but they were warping again and now the pads on the left caliper appeared to be riding the disc too tight. Had enough with the OEM setup. It was time for a BBK.
I thought long and hard on what to do. Should I go for AP Racing? Should I go Movit? Should I go for the BMW Performance setup? Or should I save up and go for the Stoptech kit?
My basic considerations for a BBK were:
. It needs to be really good. I need to trust my brakes.
. It needs to fit OEM Style 65 and Style 66 wheels. My car is driven in any weather condition and they need to fit under my winter wheels.
. It needs to feel right for the M5. No mushiness.
. I want to rely on a good supplier.
After long consideration and a bit of experience in driving M5s with other BBKs, I have decided to go with Stoptech.
For now, I have ordered only the front kit, but next year (when I save up for it) the rear kit will go in with the ST-22.
Was very good to finally have the kit with me:
Stoptech ST-40 in Red + 355mmx32mm Zinc Plated Crossdriled Discs.
They are gorgeous!
4 piston goodness!
Of course, I had to immediately proceed to detail them. I want them to look good and not be affected by the amount of brake dust that they will produce and for that, nothing better than GTechniq C5 Wheel Armour.
First step was to give the whole caliper a IPA wipedown (50/50 of water and isopropyl alcohol), to make sure the paint has no oils or fats that will reduce the efficiency of the bonding of the sealant.
Afterwards, just need to apply the Sealant with a make up pad that I stole from the Lady Boss. 3 fast dabs of product is more than enough for the whole caliper. 30 seconds after application, product was buffed out.
The application of C5 lasts up to 2 years on the wheels, so curious to see how long they will last on the caliper, when exposed to quite some heat.
Nice and protected.
But I have to admit, that the perfectionist in me, was a bit disappointed with the finish on some of the areas of the calipers (the rotors and rotor hats are amazing!). I have these two defects which are a bit annoying visually.
A missing bit of paint under the bridge
And the two parts of the calipers don't align by 1mm.
Of course, would love to have everything perfect, but insanity has a limit too. These are brakes and will stay behind the wheels. This will not be visible and I need to slap myself for this sort of things :P
One thing I like a lot about the Stoptech brakes, is the simplicity for the replacement of the brake pad. Just remove the bridge and slide in the new pads.
No effort whatsoever.
With the protection done, it was time to engage in installing the BBK! Yes!! Time to take out everything outside and get working!
Out with my comprehensive toolbox, which my colleagues gifted to me for my birthday so I could use on the M5! I was ready!
Lets get those wheels off!
Nop, saw doesn't work. Next.
IT DOESNT WORK!! Argh!
My attempt to replace the brakes myself failed miserably....
But they will be done properly, as this adventure will continue for me in London very soon!
My conclusion until now: This kit is amazing and I cannot wait to have it on and finally having brakes that match the potential of the car!