[solstice]

Originally Posted by lemetier

On the BMW DCT and F85/86, if the car is on a grade at startup and the parking brake is released before a gear is selected and it rolls against the transmission parking pawl, the parking brake will engage again.

Yeah, this is not the same as on the Cayenne’s AT + eBrake scenario where the procedure is the same as always. EBrake is on, gear in P => Footbrake on => gear in R => eBrake off => Footbrake off => Throttle = eBrake/Hold is confused and releases and engages a few times.

[lemetier]

Originally Posted by solstice

Yeah, this is not the same as on the Cayenne's AT + eBrake scenario where the procedure is the same as always. EBrake is on, gear in P => Footbrake on => gear in R => eBrake off => Footbrake off => Throttle = eBrake/Hold is confused and releases and engages a few times.

Hill hold + 70% open TC lockup clutch.

[solstice]

Originally Posted by lemetier

Hill hold + 70% open TC lockup clutch.

Do you know if hill hold is implemented with the eBrake?
If not eBrake has been 100% reliable/accurate/true over 7 years and 100k miles

I’m ok with it and won’t mind it on the G80 but prefer traditional handbrakes to be able to easily rotate the car on snow/ice and gravel roads in certain scenarios. It fits an MT car but for an AT you already give up that level of fine control so it’s a non issue in that configuration to me.

[lemetier]

Originally Posted by solstice

Do you know if hill hold is implemented with the eBrake?
If not eBrake has been 100% reliable/accurate/true over 7 years and 100k miles

I'm ok with it and won't mind it on the G80 but prefer traditional handbrakes to be able to easily rotate the car on snow/ice and gravel roads in certain scenarios. It fits an MT car but for an AT you already give up that level of fine control so it's a non issue in that configuration to me.

Main service brakes, not the parking brake.

[Boostedphil698]

I doubt BMW was concerned about saving weight in the new G80 because the cars just keep getting bigger. The should have just used a seperate caliper for the parking brake and kept the fixed setup. You're never going to convince me that the puny 1 piston rear caliper does the job well.

[brad850csi]

Originally Posted by lemetier

Does that usually happen with the beast sitting at an incline?

Nope - I have had it happen a few times in the work carpark which is completely flat. I think I just haven't pressed the button down the full way or I press it too briefly when that happens to me.

What are your thoughts on someone wanting to retrofit something like this to a G80? Theoretically possible but a complete waste of time I'm going to guess.

https://www.ebay.com.au/itm/Ferrari-...MAAOSwdAlemXnS

[heavyD^2]

At the end of the day performance is all that matters. The big M8 seems to have no issues braking with this setup. If the performance of the G8x cars improves on the outgoing models then it's mission accomplished. It all comes down to how much you want to pay for the performance and the shiny parts that are more show than go. Not everyone wants or cares to have the price point raised just so a few people can sleep better about having two piston rear calipers that provide negligible performance gains. If the stopping distances are worse than the F8x we have a predicament. If they are as good or better we don't.

[solstice]

Originally Posted by heavyD^2

At the end of the day performance is all that matters. The big M8 seems to have no issues braking with this setup. If the performance of the G8x cars improves on the outgoing models then it's mission accomplished. It all comes down to how much you want to pay for the performance and the shiny parts that are more show than go. Not everyone wants or cares to have the price point raised just so a few people can sleep better about having two piston rear calipers that provide negligible performance gains. If the stopping distances are worse than the F8x we have a predicament. If they are as good or better we don't.

Yes, let’s wait for the M5 CS ring time to see if this is a sufficient setup for a smaller lighter car...

[Boostedphil698]

Originally Posted by solstice

Yes, let’s wait for the M5 CS ring time to see if this is a sufficient setup for a smaller lighter car...

The M5 has had single piston rears since the dawn of time...

[solstice]

Originally Posted by 435i_Phil

The M5 has had single piston rears since the dawn of time...

Yes but there’s never been a CS before...it’s capabilities need to exceed that of a G8X base and comp. It’s the first M5 with track leaning focus on par with an M3.

[Boostedphil698]

Originally Posted by solstice

Yes but there's never been a CS before...it's capabilities need to exceed that of a G8X base and comp. It's the first M5 with track leaning focus on par with an M3.

I'll be shocked if they give it fixed rears.

[solstice]

Originally Posted by 435i_Phil

I'll be shocked if they give it fixed rears.

They won’t. Pictures confirm that. My point is that if the single piston floating rears are good enough on a much more powerful, heavier and track focused M5 to go nuts around Nordshliefe they are good enough for the G8X

[Boostedphil698]

Originally Posted by solstice

They won't. Pictures confirm that. My point is that if the single piston floating rears are good enough on a much more powerful, heavier and track focused M5 to go nuts around Nordshliefe they are good enough for the G8X

Yeah, well keep in mind, the M5 has front 6 piston brakes, the M3 and M4 only have 4 piston.

[Thunderstorm]

Originally Posted by 435i_Phil

Yeah, well keep in mind, the M5 has front 6 piston brakes, the M3 and M4 only have 4 piston.

Looks like a 6 Piston caliper to me.

[SYT_Shadow]

On one hand I think it's a set backwards

On the other, Mercedes even sells their GT-R with sliding rear calipers on the ceramics and no one seems to mind


At the end of the day if you are seriously tracking the car it doesn't matter which brakes it comes with, you will need to upgrade

[Boostedphil698]

Originally Posted by SYT_Shadow

On one hand I think it's a set backwards

On the other, Mercedes even sells their GT-R with sliding rear calipers on the ceramics and no one seems to mind


At the end of the day if you are seriously tracking the car it doesn't matter which brakes it comes with, you will need to upgrade

I just don't understand how Porsche has accomplished what the 3 other manufacturers can't.

[SYT_Shadow]

Originally Posted by 435i_Phil

I just don't understand how Porsche has accomplished what the 3 other manufacturers can't.

I don't think it's a "can't" issue but more of a "want" issue.

What advantage does it present? Porsche also uses a floating rear in the Macan, at least the 1st gen.

[solstice]

Originally Posted by SYT_Shadow

I don't think it's a "can't" issue but more of a "want" issue.

What advantage does it present? Porsche also uses a floating rear in the Macan, at least the 1st gen.

The 911 and Cayman/Boxster are different animals due their rear/mid engines. A front engine car has very low rear axle pressure under hard braking making big brakes overkill but rear engine and mid engine cars can benefit from stronger rears.

The M3 is also under way more price pressure and better spend the budget were it makes a different.

[SYT_Shadow]

Originally Posted by solstice

The 911 and Cayman/Boxster are different animals due their rear/mid engines. A front engine car has very low rear axle pressure under hard braking making big brakes overkill but rear engine and mid engine cars can benefit from stronger rears.

The M3 is also under way more price pressure and better spend the budget were it makes a different.

For sure

[hellokitty]

Originally Posted by SYT_Shadow

For sure

It seems like the accountants are running M division these days.

[solstice]

Originally Posted by hellokitty

It seems like the accountants are running M division these days.

I more feel that they are loosening their grip some. The significant upgrades to the 6 MT and the G81 seems like two very questionable ROI items from a bean counters view.

And budget optimization to use money were they make the biggest difference (not rear brake calipers) sound like engineering lead development.

[SYT_Shadow]

Originally Posted by hellokitty

It seems like the accountants are running M division these days.

Budget control is a necessary measure. Even the 200k GT3s so many people here lust for have 'budget control'.

If I get one to track I will have to upgrade the brakes anyway, so it doesn't really make a difference to me.