Brembo on a budget! Let's make x5 great again :)

[mikew2069]

Originally Posted by Mr.47

Acronym for
To
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Oh, not even coding related. Even better.

[BimmerTy]

Originally Posted by Mr.47

When coding a BMW the thought of bricking a module due to me screwing up a process sends my anxiety thru the roof, so is good to be thorough just to be safe. When I read Alan L. coding guide, which was simple, i was totally lost lol!




Acronym for
To
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Acronym for
Too**
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[classic_erik]

So my attempt to upgrade my F15 to the MPBK with F85 rotors continues to take shape.

My local dealership just came back to me stating that the F85 rear rotors would not be plug and play with the F15 out of the box without some machining work. Can anyone comment?

"The rotors for the F85 will fit the front of your vehicle but the rear will not. You would have to machine a hole in them for the rotor bolt and it also depends on what rear end you have in the vehicle. A standard diff ro what they would call QMVH."

[yewlock]

Originally Posted by classic_erik

So my attempt to upgrade my F15 to the MPBK with F85 rotors continues to take shape.

My local dealership just came back to me stating that the F85 rear rotors would not be plug and play with the F15 out of the box without some machining work. Can anyone comment?

"The rotors for the F85 will fit the front of your vehicle but the rear will not. You would have to machine a hole in them for the rotor bolt and it also depends on what rear end you have in the vehicle. A standard diff ro what they would call QMVH."

It is true.

[KillFox91]

Originally Posted by yewlock

It is true.

True if you want the rotor to be attached to the vehicle by a screw. This is not necessarily required as most other automobile manufacturers do not attach rotors to the hub via a small screw like BMW. The wheel and lug bolts will keep the rotor centric and snug. IMO it's just for ease of use that they do this in the first place.

[Maverik259]

Originally Posted by KillFox91

True if you want the rotor to be attached to the vehicle by a screw. This is not necessarily required as most other automobile manufacturers do not attach rotors to the hub via a small screw like BMW. The wheel and lug bolts will keep the rotor centric and snug. IMO it's just for ease of use that they do this in the first place.

What he said.

[classic_erik]

Originally Posted by KillFox91

True if you want the rotor to be attached to the vehicle by a screw. This is not necessarily required as most other automobile manufacturers do not attach rotors to the hub via a small screw like BMW. The wheel and lug bolts will keep the rotor centric and snug. IMO it's just for ease of use that they do this in the first place.

So are most people here opting to machine the additional rear screw hole or just bypassing and relying on the lug bolts?

Anyone have a picture of this bolt?

[pits200]

Originally Posted by classic_erik

So are most people here opting to machine the additional rear screw hole or just bypassing and relying on the lug bolts?

Anyone have a picture of this bolt?

It's not only the lug bolts, caliper housing/brakes will also keep it mostly square without the set screw.

It really isn't a big deal but you'll want to ensure when you put the tire on that you use a star pattern on the rotor doesn't get slightly angled especially being we don't have studs, this is more likely to happen.

[KillFox91]

Originally Posted by classic_erik

So are most people here opting to machine the additional rear screw hole or just bypassing and relying on the lug bolts?

Anyone have a picture of this bolt?

It's literally like a 10mm bolt with an Allen head about 1 cm in length. It is there purely to hold the rotor in place while you reattach all your brake components.

As pits said; the brake components, lug bolts, and wheel all hold the rotor in place and the bolt holds almost zero value in the way of importance. IMO it would be a waste of money to machine a hole.

[Maverik259]

Just heard back from Tronic today. Apparently it's no longer the panamera rear caliper they use for the 4 pot fixed upgrade. It's a VW Touareg because it's cheaper. But the price hasn't changed sooo lol.

[HydroStream6]

Any updates on rotor options? The only budget front rotor option I'm seeing is the Brakecentric.

Thanks!

[Maverik259]

Originally Posted by HydroStream6

Any updates on rotor options? The only budget front rotor option I'm seeing is the Brakecentric.

Thanks!

That's it man. It's sucks cuz others make em for the M5. You'd think someone would give this is 2 generations in a row with the same size rotors. Seems like a good market.

[pits200]

Freeman makes the fronts and that's what I have on my x5. I'll be honest, I'm too lazy to look up the model rotors but they were like 150 each. They aren't slotted or drilled but the performance is fine.

[HydroStream6]

Can anyone confirm what is needed for the rear brake conversion? Is it simply ordering the larger 385mm rotors and then moving th ecaliper out? NO bracket change needed?

My Brembo front calipers and 395mm rotors are on the way, so just need to get the rears figured out and then figure out what pads! Wish I could find more info on those Power Stop Z23s. I want something with some bite but little dust (best of both worlds, haha).

Thanks!
Adam

[mikew2069]

Originally Posted by HydroStream6

Can anyone confirm what is needed for the rear brake conversion? Is it simply ordering the larger 385mm rotors and then moving th ecaliper out? NO bracket change needed?

My Brembo front calipers and 395mm rotors are on the way, so just need to get the rears figured out and then figure out what pads! Wish I could find more info on those Power Stop Z23s. I want something with some bite but little dust (best of both worlds, haha).

Thanks!
Adam

You need new rear brackets.

[Maverik259]

Originally Posted by HydroStream6

Can anyone confirm what is needed for the rear brake conversion? Is it simply ordering the larger 385mm rotors and then moving th ecaliper out? NO bracket change needed?

My Brembo front calipers and 395mm rotors are on the way, so just need to get the rears figured out and then figure out what pads! Wish I could find more info on those Power Stop Z23s. I want something with some bite but little dust (best of both worlds, haha).

Thanks!
Adam

Curious why you would think this? This thread is pretty thorough as to what is needed. Recommend starting at page 1. It has all the info there.

Now technically while the 50i caliper could fit on the 385mm rotor it would require spacers to lift the caliper up from the hub. But the 35i is not even an option. The braking surface is the same on the two size rotors. The M rotor just sits further from the hub. The piston is also larger on the 50i compared to the M caliper. Again all stated in this thread.

Honestly I wouldn't even waste the money on changing the rear caliper and rotor. Unless you go with an upgraded caliper such as a fixed 4pot brembo.

[pits200]

Originally Posted by Maverik259

Honestly I wouldn't even waste the money on changing the rear caliper and rotor. Unless you go with an upgraded caliper such as a fixed 4pot brembo.

I always wondered why the front was so much more important than the rear. Besides the asthetics of the brembos in front, going from the 50i 365mm fronts to 395 gains you 30mm in surface area. Ya, I know going to a 4 pot helps but that's more for feel and fade than braking power. The rear going from 345mm to 385 technically nets you more surface area albeit with a single pot but you could argue that the gains are still decent and not inconsequential.

Also, I think BMW biases their brakes to the rear more than a lot of other companies based on how evenly the front and rear pads wear. And I get that rear pads can wear more due to e-diff functionality.

OH well, just my two cents on the rears being important from a functional perspective despite the unsightly single pot calipers.

[HydroStream6]

Originally Posted by Maverik259

Curious why you would think this? This thread is pretty thorough as to what is needed. Recommend starting at page 1. It has all the info there.

Now technically while the 50i caliper could fit on the 385mm rotor it would require spacers to lift the caliper up from the hub. But the 35i is not even an option. The braking surface is the same on the two size rotors. The M rotor just sits further from the hub. The piston is also larger on the 50i compared to the M caliper. Again all stated in this thread.

Honestly I wouldn't even waste the money on changing the rear caliper and rotor. Unless you go with an upgraded caliper such as a fixed 4pot brembo.

OP had posted earlier in this thread that the rears may not require a new bracket, hence the question.

Ordered stock size stuff for the rear. All in, I'm at about $1050 for used front calipers, new front rotors, new rear stock rotors, new Power Stop Z23 pads all around, new wear sensors. Not bad!!

[Maverik259]

Originally Posted by HydroStream6

OP had posted earlier in this thread that the rears may not require a new bracket, hence the question.

Ordered stock size stuff for the rear. All in, I'm at about $1050 for used front calipers, new front rotors, new rear stock rotors, new Power Stop Z23 pads all around, new wear sensors. Not bad!!

Didn't go oem rotors I take it.

[fr_tz]

My rotors are in..drill patterns are the same for F10/F85 but you get an extra drill with the massive 400 front

Fronts: 400x36
Rears: 385x24

[Maverik259]

Originally Posted by fr_tz

My rotors are in..drill patterns are the same for F10/F85 but you get an extra drill with the massive 400 front

Fronts: 400x36
Rears: 385x24

Nice. Although the F85 has 4 holes as well. I mean the F10 is only 2.5mm wider in braking surface. Really confusing why they even bothered with manufacturing costs for such a small difference to be honest.

[fr_tz]

Originally Posted by Maverik259

Nice. Although the F85 has 4 holes as well. I mean the F10 is only 2.5mm wider in braking surface. Really confusing why they even bothered with manufacturing costs for such a small difference to be honest.

Didn't notice you get 4 holes with the F85 fronts. Anywho, remember not only are the F10 fronts larger in diameter they're also 7 pounds lighter each than the 395s.