The other member was confused. The rear brakes engage milliseconds before the front to help reduce front end dive, but the front to rear bias still follows normal convention.

 

Cheers,
precisely why I discourage home-schooled mechanical engineering. Learned so much from OEM engineers when it comes to misconceptions we pedestrians have.

 

I don't believe the ABS system would let that happen.

 

The ABS wouldn't know anything about it unless wheel slip was induced.

 

Actually the ediff changes the gear ratio and the supercharger clutch is disengaged to act as an air brake. There is unconfirmed rumors that the front suspensions is hardened and the rear loosened.

Jaguar can learn so much from our community.

 

I would be interested to understand how that would be done. The only thing I could think of that would do that would be some sort of electronically controlled proportion valve system.

 

ABS would be the only thing that could pull that off, by releasing the front brake for a millisecond.

Why would they build a separate computer to do this when they have a computer in the abs. Its a question since we are all hypothesizing.

This feels like the time I accidentally got into a car with another driving student thinking he was the instructor.

 

I can't comment on the 2014 on cars but for the others the initial bias appears to be 50/50 initially according to Jaguar's 2012 Chassis Guide:

Electronic Brake Force Distribution
Electronic Brake Force Distribution (EBD) uses the Hydraulic Control Unit (HCU) to optimize the balance of the vehicle. Therefore the need for a Pressure Conscious Regulating Valve (PCRV) on vehicles with EBD is redundant.

The ABS module monitors the wheel speed sensor signals when the brakes are applied for activation of EBD. The ABS module compares the speed at which the front and rear axles are slowing down to determine vehicle loading.

If the rear axle is slowing at a similar rate too the front, it indicates that the vehicle is loaded and braking force need not be limited to the rear axle.

If the deceleration of the rear axle is greater than the front, the vehicle is lightly laden and less braking force can be applied to the rear. If the same force was applied, then the balance of the vehicle would become unstable.

The values for the relative deceleration are programmed in the ABS module. Equal force is applied to the front and rear axles until the threshold values are exceeded. At this point, the ABS module will cycle the inlet valves at the relevant axle to limit or reduce the braking force to that axle.

EBD functionality is similar to ABS. Whereas ABS control each wheel independently, EBD controls the wheels axle by axle.

 

Thank you for that most informative post. Putting you down as a solid in my books.

And Thank You for making me feel like Donald Trump- we were all pulling things out of our rear ends- with authority no less, and I was closest to being correct in this psychiatric ward.

 

So what do you guys think? Akebono's for the rear and EBC Redstuff for the front on a '10 XKR...would that be a good combo as far as stopping power and, of course, little to no dust?

 

I just installed Akebono's front and rear. Did not notice any pros or cons in stopping effectiveness. Just been a few days but I do think that the dust issue will be much better.

 

Put the Akebonos on our old S-Type, dusting was extremely light and the OEM pads were horrible about it. Front wheels would be black in a weeks time. The dusting on my VDP is ridiculous. I recently checked the brakes thinking it may be due for a replacement. Nope, it looks like it had brand new OEM pads just before I purchased it last year. I guess I'll be living with the dust for awhile. I can't justify tossing perfectly serviceable pads.

 

Same here, very little dust, no braking issues.

 

Only noticeable difference from the OEMS is the initial bite when braking. For me, not worth the horror show of cleaning my wheels every time I drive around the block.

 

I'd say that's accurate. Less grabby at light pedal, but just as effective under hard braking. The OEMs grabby nature make the brakes feel too touchy sometimes and ceramics feel more linear. I've always used ceramics when replacing brakes on every car I own so it's what I've become accustomed to.

 

On fighting brake dust/ rotor dust from either brakepad
I put some ceramic coating on the wheels, it nearly rinses of without toughing. And gets dirty less often. As a bonus, water blows off it too, so no water spots and places for dust to stick.

The absolute best thing I have found for getting them to new condition is a clay bar.
here is a pic. now they stay clean!

 

Arrrg. photo server must be down

 

In the 2014 Xkr the brakes are rear biased. The dealer confirmed this. I do not know which year they made this change. I had the rear brake pads changed at 17k miles. I am now at 29k miles and have yet to change the front pads. If this we were a traditional braking bias then the fronts would be wearing faster not the other way around. My rears are wearing twice as fast as the fronts. Would someone care to explain that.

 

Explain sure; smart dealer figured out how to get you to pay for a factory defect. Possibly bad handbrake adjustment.

I can tell by the brake and rotor dust what end of the vehicle the brakes are biased. If logic wasnt enough. Its front biased dude. And big time. Look at the difference in the size of the rotors.

 

The promised photo from the earlier post.