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Discussion Starter · #363 · (Edited)
XFR is getting the front discs and pads replaced on Monday under the MOT insurance that's provided via the Jaguar Approved Used Warranty so she'll be back in fighting form on Monday.

Stripped the brakes down to get a look at them last night. The discs aren't in bad condition and have no lip on them at all. When you put your fingers on the back of the disc and spin the hub you can feel almost like a sticky section on the disc. I'm fairly certain its pad transfer that's caused it. They could be skimmed but that's not covered by the warranty so new discs it is :)

Think I'm going to give the specialist the YellowStuff pads that I bought from Neil when he sold his R-S and have them fitted instead of the originals. If he wants to fit the genuine ones provided by warranty I'll swap them over when I get the car back in attempt to reduce the horrendous amounts of dust that come off the OE pads.

David.
 

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Those discs could probably be saved by some heavy braking manoeuvres.
 

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Discussion Starter · #365 ·
They're grooved on the back too which is strange as the pads are still perfectly smooth.

I've said to the specialist to put them in the boxes for the new ones and I might have them skimmed as they've only done around 8k miles.
 

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Those discs could probably be saved by some heavy braking manoeuvres.
They're grooved on the back too which is strange as the pads are still perfectly smooth.

I've said to the specialist to put them in the boxes for the new ones and I might have them skimmed as they've only done around 8k miles.
Therein lies (at least) part of your problem...
 
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I misread is as they were not grooved.

If I remember we found something similar on @sdotk’s car. EBC discs were worn weirdly on the inside. When I swapped them again I thoroughly cleaned the slide pins.


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Discussion Starter · #368 ·
I reckon the biggest problem with the Jaguar discs is they’re crap steel.
 

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Are they actually "steel"? I thought they were cast iron? I can remember japanese motorbikes years ago proudly proclaiming they had stainless brake discs, which were fine until it rained.
 

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Both my XFs have worn the inside face of the disc and the pad much more quickly than the outside.

Never judge the state of your brake pads and discs by looking at the outside.
 

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Discussion Starter · #373 ·
Both my XFs have worn the inside face of the disc and the pad much more quickly than the outside.
That’s what happened to the last set on this car as well.
 

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Wearing the inside is normal for this type of calliper. But the strange unevenness isn’t.


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Honda, Kawasaki, Suzuki & Yamaha managed to make single sided sliding calliper brakes that wore (pretty much) evenly on both sides more than 40 years ago..
 

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Discussion Starter · #376 ·
If there was a bolt on 6 piston upgrade that used the existing discs I’d be sorely tempted to look at it.

In 2010 the Range Rover was changing from the 4 pot Brembo calipers they’d used since 2007 to the 6 pot Brembos but the 2010’s ended up with twin piston sliding ones.

The 6 pot upgrade on that bolts straight on and is very straight forward but the XFR upgrade seems to be a lot more costly and involves non standard discs and pads too.
 
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I’m fairly sure Wortec do a kit. But it ain’t cheap.


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I misread is as they were not grooved.

If I remember we found something similar on @sdotk’s car. EBC discs were worn weirdly on the inside. When I swapped them again I thoroughly cleaned the slide pins.


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Yep, the inside of the discs (can't remember which now but it was more than one) had worn less on the outer edge than inner edge.

EBC blamed the geometry which makes no sense. Thankfully the current set are wearing as expected.
 

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Found it David, it was the front pair.

 

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Discussion Starter · #380 ·
Thanks :) Interestingly, the discs that were on my car when I got it were horrendous on the inside edge. These ones were a little bit scruffy compared to the front but it was definitely pad transfer causing the judder.

Mine now has another set of genuine Jaguar front discs (2nd replacement set since I've had it due to judder and uneven wear as I've only done 16k in the car in 4 years) and Yellow Stuff pads. Just need to try and find a couple of hours one day this week to get it retested :)

David.
 
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