Quote:
Originally Posted by X53Jay4.8is
Hey propeller head last year you installed a set of beautiful stoptech bbk on your BMW X5 e53. I noticed your X5 is a 4.8is and converting your braking system to the stoptech decreased rotor thickness by 4mm. Essentially going from 36mm thickness to a 32mm thickness. Now that you have had the set with some miles can you provide some feedback on the kit. Any adverse outcomes crossing over to the BBK? How many miles on the set and has there been any warping? I have the 4.6is and I love big brake kits also so I am considering this modification. Appreciate any insight you can lend on the matter.
Thanks
Jay
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I am still very much enamored with the StopTech BBK. It has performed extremely well for the last 18 months. No new brakes yet.
I would say the adversity comes when it's time to replace parts. I have enjoyed these since the day I got them installed. They work great, the unsprung weight benefit is something I notice every day.
No warping on any rotors. I read somewhere that the 4.4i brakes were plenty to stop either the 4.4 or the is models. BMW needed to make some sort of 'upgrade' in brake specs to go along with the is models. Indeed, even at a decreased front diameter on the 4.8 kit, and with less thickness all around, they've done great.
Since I installed them in early 2014, I've been busy in the X5! Three family road trips make up just under 1/2 the 30k miles I have put on these StopTechs. Most of the rest are road trips for work, as recently as today adding another 600 or so miles. I work from a home office, so while I do shuttle from soccer games to pizza place, I find myself filling up about once a month.
And the type of work I asked them to do was as varied as Pikes Peak and 38 degrees all the way down to The Sonoran Desert at 108. We've run through at least 6 National Parks, countless gorges and passes, and even our fair share of dirt 'maintained' roads. Even with the girls' luggage outweighing both their body and the ability to actually wear everything that they packed, I never worried about fade. Application is flat and taught.
I am hoping to welcome some new wheels this month. If I do, I will likely take the time to clean, polish, and seal the silver calipers. All those miles have them looking less than 'new.'
