Yet another BBK thread ..E89 specfic…

[pbondar]

So most of the parts arrived for the ‘small’ BBK for the rear..

F10 series calipers and E60 series disks…these rears are bigger than my current 6 pot Brembo front disks..

The F10 series caliper just looks like an upscaled copy of the E89 version.

Done a first paper mock up of a possible bracket to join these to the E89 chassis.

Not only is the disk much bigger 345 vs 300 or 324 for non 35is / 35is but the depth of the swept area is bigger..pic shows an E89 rear pad (same pad on both 300mm and 324mm rear discs) vs the E60 pad..

Autodoc do a cute trick with TRW ..they sell a ‘remanufactured’ real caliper for about a 1/5 of the price of an E89 caliper..

One caliper bracket wasn’t available in TRW OE supplier so bought a pattern part..interesting to see the myriad of differences…hopefully it will work ok..

 

[pbondar]

So reflecting on the various issues I bit the bullet and bought a couple of old rear hubs and bits with a view to being a lot easy to faff around with bits off the car rather than on..

A few head scratching hours playing with the old bits and my new bits…plus lots of washers, spacers, bolts..

As Meatloaf would say 2 out 3 ain’t bad..however in this case you need all 3 things to work for it to be a viable solution..

These parts are for a 345 mm disc with a 44mm piston sliding caliper solution..roughly based on a 5 series non M

I’ve got a set of M5 rear calipers coming with the option of a 370mm or 380mm rear disc….

New disc is 345mm vs an old E89 300mm disc from the non 35i/35is E89s…

 

[pbondar]

First trial fit of the 345mm E60 discs with F series 5 caliper and my first attempt at a bracket ..looks pretty ok..

 

[Armando1969]

Hi Peter,
I hope that you get what you are aiming at, but my guess is that when you count all the cost at the end. The PB/Ceika option probably won't be far off in cost and les hassle. But I applaud you for trying.

 

[pbondar]

Hi Peter,
I hope that you get what you are aiming at, but my guess is that when you count all the cost at the end. The PB/Ceika option probably won't be far off in cost and les hassle. But I applaud you for trying.

Ignoring R+D...the 'production cost' of a set looks to be round £750 max..against a current price of over £2,500 for a 345mm solution from Ceika or PB..of course not as sexy looking..but..cosmetically having a Ceika/PB on the rear really means you need there front BBK to match..or as I being fussy?