[Tink]

Ok Jag went in for MOT this morning .. Passed but with 2 advisories


Nearside rear brake fluctuating, but not excessively (3.7.B.3)
Offside rear brake fluctuating, but not excessively (3.7.B.3)


Whats that mean ??

 

[payno]

It means the brake test rollers have picked up a slight fluctuation from the brake disks you wont feel this your self when driving as your not as sensitive as the MOT brake rollers

In other words the disks are very slightly out of true (wear and tear)

 

[Tink]

why cant they just say slightly warped lol I'd have known then !!

 

[Corbeliere]

They might not want you to know! They might just want to fix it for you, at a cost of course.

 

[Tink]

Rear pads have about 30% left in them got a mate who will replace pads & discs for me very cheaply

Can get Brembo discs and pads for just under £110 from Euro Car Parts

 

[Neilr]

Rear pads have about 30% left in them got a mate who will replace pads & discs for me very cheaply

Can get Brembo discs and pads for just under £110 from Euro Car Parts

Some of Brembo's standard stuff are made in China now. I would prefer to stay with OEM (ATE) or something similar like TRW, Pagid/Textar, etc which are more often made in Europe (usually UK or Germany).

 

[Zippo]

At least they are broken in balance!

 

[JimC64]

Some of Brembo's standard stuff are made in China now. I would prefer to stay with OEM (ATE) or something similar like TRW, Pagid/Textar, etc which are more often made in Europe (usually UK or Germany).

I'd go with Pagid, they've been great for me on my A6 as well as the XJ

Good stopping power and reasonably low brake dust too

They also come with a 25k mile or 25 month warranty!

Jim

 

[Craig_David]

To be fair there the fluctuation might not be warped discs.

 

[JimC64]

To be fair there the fluctuation might not be warped discs.

True, could be sticky caliper issues, been there

Jim

 

[OzJagXFS]

This has been covered countless times on countless forums, but "warped brake discs/rotors" is basically a myth, instead what you might have is uneven pad material deposition on the discs, see here for example: https://alconkits.com/technical-info/brake-tech/56-the-myth-of-warped-brake-discs

 

[RichardF]

A myth you say. I have to disagree Oz. Having being in the trade for 30 years I can assure you it is no myth. Warped discs can be caused by various ways but the usual one is the sliding calliper seizing thereby putting more pressure on one side of the disc; compounded nowadays by the stop/start eco system which entails keeping the foot brake on at a halt. This is especially so after a motorway or fast run then coming to a halt with the discs very hot after braking.

 

[Poundy]

It's an advisory so just carry on until the pads are shot and change the discs at the same time. I am amazed at how little wear you get from the rear pads compared to the fronts on the XF. At least 2 sets of rears to a set of fronts less than 20K for my rears, "what's that all about then" :mrgreen:

 

[idrobbo]

The braking system favours the rear.

 

[philayl1]

Hi if you can find a nice quiet road give it some beans, the faster the better, then slam the brakes on, do this a couple of times and it should clear any deposits on the discs, certainly works for me. Phil

 

[Marks_DTM]

It's an advisory so just carry on until the pads are shot and change the discs at the same time. I am amazed at how little wear you get from the rear pads compared to the fronts on the XF. At least 2 sets of rears to a set of fronts less than 20K for my rears, "what's that all about then" :mrgreen:

Its the stability and traction control plus the associated smaller disc and pad size, so when you get a little untidy in a corner or light the rears up then the associated brakes get applied to tidy things up.

Hence they wear quicker than cars of old.

They are still only providing 30ish percent of the braking effort under normal operation.

 

[Cas]

Hi as idrobbo mentioned the XF is similar to the S-Type that went before it in that under light to moderate braking more pressure is sent to the rear brakes to stop the nose of the car dipping.
When I asked my local Jaguar dealer about the rear brake pad wear on my previous S-Type R they said it was a “Comfort feature”. Over 110,000 miles it needed rear pads every 20,000 miles and new rear discs every 40,000 whilst the first set of front pads lasted over 50,000 miles and I had the front discs changed for the first time at around 95,000 when a second set of pads were fitted.
My XFR-S that replaced it has so far done 25,000 on its first set of rear pads and when serviced last week the dealer said they were 35% worn compared to 15% warn on the fronts so maybe I had better brake harder going forwards

Cas