Technical E70 X5 35d Factory Big Brake Upgrade

fmorelli

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Here's the spreadsheet that compiles the big brake upgrade. On the 35d we go from 348x30mm single caliper front brakes to 365x36mm 2-pot calipers. in the rear 320x20mm to 345x24mm. A pretty significant increase in brake capability. Basically the net of it is, a variety of X5/X6 vehicles have the same hub carriers, including the V8 models with bigger brakes front and rear. Fronts were actually cheapest with Cardone BMW rebuilds (ATE/BMW stamp). Rears didn't exist rebuilt, so eBay purchase and a little clean up.

 
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fmorelli

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Ok first off the rears.
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fmorelli

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Brake bleeding these is a bitch. I've always used a Motive power bleeder. Even running the ISTA routine for getting air out of the ABS pump, I could not get pedal. @Seb335i recommended I gravity bleed new brake installations, and then he recommended the old school manual pump - 5 pumps at a go, leaving the bleeder open until fluid came out with bubbles, usual progression from right rear brake.

Well when I got to the passenger front (3rd bleed point), fluid started coming out then just stopped moving while my son pumped. All of a sudden froth came out for about 5-10 seconds, like the milk from a cappuccino. Never seen anything like it. Brakes are much better but not quite right yet. I'll drive it for a day or so, and then bleed it again, and run through the ABS pump routine. I suspect that will take care of business.
 

hardparker

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I run nearly the same setup on my F25 X3 and really like it. Rear calipers for mine are the 550i calipers with electronic parking brake, which is the only significant difference.