Drive a 99 Vanden Plas not supercharged and do loads of Hwy driving into the city then loads of braking. The stock brakes are just not up to the weight of my ship and I would like to upgrade to non flashy XKR/XKS/XJR calipers and have 355mm rotors up front. I have now searched for a week with much conflicting info. I think 1999-2006 XK8-XKR calipers would do the trick but I cant pin down part numbers etc. I see MJD 7842AA, JLM 21468 and others but want to be sure prior to ordering. Also rotors have a slew of numbers as well, I want 355mm

When I search I get below but means nothing without part numbers or specific year and model that guarantee what I am in search of. Any guidance would be so appreciated.


2000 Jaguar XKR::From Chassis Number A22-191;Front & Rear

2001,2002 Jaguar XKR Base Convertible 2-Door::Front & Rear

2001,2002 Jaguar XKR Base Coupe 2-Door::Front & Rear

2001 Jaguar XKR Silverstone Convertible 2-Door::Front & Rear

2001 Jaguar XKR Silverstone Coupe 2-Door::Front & Rear

2002,2003 Jaguar XJR::From Chassis Number F39-526;Front & Rear

2002 Jaguar XKR 100 Convertible 2-Door::Front & Rear

2002 Jaguar XKR 100 Coupe 2-Door::Front & Rear

2003 Jaguar XKR::355mm Front Rotors; 330mm Rear Rotors;Front & Rear

2004,2005,2006 Jaguar XKR::Front & Rear

 

the 355mm rotors are for the Brembo/R1 kit for the 01-03 XJR's. Not sure about cross compatibility to the XKR, would probably only cross from the earlier gen xk's maybe (x100?). If you want non-brembo brakes, which would be the 325mm rotors on 99-03 XJ's, those get floating 1 piston calipers instead of the brembo brakes.

Brake Disc and Caliper-Front - Parts For XJ Series from (V)812317 to (V)F59525 (X308 - Canada/Mexico/USA) | Jaguar Classic Parts UK

The "R" performance option under calipers will be the 355mm brembo brakes, the "except R" will list all the non-brembo options.

 

^ This
single piston floating caliper XJR brakes with standard 325mm disks should be more than up to the task for a daily driver.

If you're having brake issues maybe something else is the cause? I recommend a full flush of your brake fluid.

Also, where are you looking to buy from? You should be able to find calipers pretty easily through either these forums, or a Jaguar wrecker, although forum sponsor SNG Barratt will likely have everything you need too. Don't forget to ask for the 10% forum discount.
SNG Barratt - The Ultimate Jaguar Parts Specialist

 

Ok super now we are on to something. I mentioned XKR caliper because I thought they were the same as XJR and I am more than fine with a 325 mm disk. So my question is if I am buying from wrecker or ebay I can be confident in ordering 1999-2003 XJR/XKR and they will accept a 325mm rotor.

To answer your comment grandell that was the first thing I did was a total flush. The car is in storage for the winter and comes out next month so I am anxious to get driving her and lining up all my bits to start my tinkering. Does below look like what I need?

Year: 2000
Make & Model: XJR
00 01 02 03 JAGUAR XJ8 LEFT DRIVER SIDE FRONT WHEEL BRAKE CALIPER OEM | eBay

UP FOR SALE IS A 2001 JAGUAR XKR X100 SUPERCHARGED FRONT LEFT DRIVER AND RIGHT PASSENGER BRAKE CALIPER PAIR OEM
00-04 JAGUAR XKR XK8 X100 FRONT LEFT DRIVER AND RIGHT PASSENGER BRAKE CALIPER | eBay

 

Looking through the SNG Barratt site it looks like there are different part numbers for XJ and XK brakes.
Doesn't mean they won't fit... but it doesn't mean they will either.

XJR calipers are part numbers JLM21471/2, XKR calipers are part numbers JLM21467/8

 

Something must be a miss -- the VDP's brakes are up to the task.

When was the last flush and what rotors /pads?

Jaguar never skimped on the brakes.

 

Thank you grandell, this was my issue. yeldogt I just did a full flush and replaced rotors (aftermarket) and ceramic pads just last spring. I am getting a steering wheel vibration on heaving braking. I drive into the city and do heavy breaking, then stop and go. My thoughts were that maybe they were heating up way too much. My other thoughts were bake lines were deteriorating and was going to replace with upgraded calipers anyways. Sooo...

 

I've have pretty good luck with drilled and slotted rotors. Also, are your front brake cooling tubes in place? A lot of times they are missing.

 

XJR calipers should be pretty easy to find, and make for a cheap bolt-on upgrade if you're going to replace parts anyway.

If you're getting vibration under braking then you've possibly warped the rotors, or have a seized caliper? Also don't cheap out on replacement rotors. Most aftermarket ones are still good, but I always prefer genuine, or at least OEM rotors.

Your stock braking system shouldn't have any issues AT ALL with stop start braking in town. and even one hard stop from speed shouldn't heat up ceramics that much. That being said, ceramics are often chosen for their lack of brake dust, rather than all out performance. Eg I have Akebonos, and it doesn't take much to get them hot, which is why I wouldn't use them on a track... but I've never had an issue with daily, or even 'spirited' driving
Sounds like maybe you're being a bit hard on them? Maybe try adjusting your driving style. It's a Jag, not a racecar

 

knew I'd seen something recently...


https://www.jaguarforums.com/forum/p...8-x100-177777/

 

Yes,i am selling the complete set. With all the upgraded rotors,pads and steel. Performance is very close to R1 brembo

I am dare to say because i have another Jaguar with the R1 calipers.

Let me know if anyone is interested

 

I always use the OE pads and rotors ...never a problem and I get two pad changes from the fronts. Buy correctly once form an online dealer at a discount ... no issues ... no problems.

So ... you buy aftermarket stuff and your not happy and you want to replace the calipers? How much is that going to cost .. and you still have to replace the rotors and/or the pads

And what exactly are "ceramic pads" . My VDB had great brakes --

 

I thank all for your comments guidance, and wisdom. After thinking it through I have decided to replace the rotors and pads with an EBC Brake kit and keep the OEM calipers.
vincent661983 your setup was tempting but to ship to Canada would be a nightmare.

"EBC Brake Disc and Pad Kit --
EBC – S12 REDSTUFF BRAKE PAD AND RK ROTOR KITS
EBC’s S12 pad and rotor kits combine their advanced-formula Redstuff brake pads with their premium RK replacement brake rotors for a braking tandem that works well whether hot or cold with only minimal amounts of brake dust. The rotors have a higher carbon content than most so they’ll resist warping under high heat better and the Redstuff brake pads are formulated with high-tech Aramid fiber and ceramic granule materials that provides strong braking power throughout a wide temperature range while producing the least amount of dust of any EBC brake pad. EBC’s renowned reputation for quality and performance is the result of rigorous testing on the road and the track.
Redstuff pads are known for their minimal dust production
Pad compound features Aramid fibers and ceramic granules
Redstuff pads are effective through a wide temperature range
Anti-corrosion GEOMET and NITROTHERM finishes
High-carbon rotors resist warping and cracking from high heat
Machined to close tolerances, inspected before approval

 

Just so you know some of the harder no dust pad don't work as well cold .. IMO none of them do.

The reason MB, Jaguar and Porsche have dusty brakes -- they use a softer pad material that has great feel the first time you use them -- they perform the best and last long enough. Don't destroy the rotors.

Everybody believes all the hype from the aftermarket companies -- do you think a company like Porsche designs a powerful brake system and then goes cheap with something easy ........ like a set of pads?

 

just a quick guide on the basic brake pad compounds What Are The Best Brake Pads? Ceramic vs. Semi-Metallic

I've had good luck with semi-metallic pads in general, also prefer their feel. On the Eclipse I recently put some ceramic pads on cause they were on a sale, they vibrate a bit less but the bite is really poor, noticeably at low speeds and extremely noticeable when very cold. Couldn't remember what pads I used to have on there but they were probably semi-metallic.

When i got the XJR I replaced the front rotors and pads with the 325mm kit available on RockAuto with semi-metallic pads. No complaints so far except a tiny bit of sticktion at near-stop, which is more due to the car sitting for months after I installed the front rotors. I was considering getting the EBC Redstuff pads since they seem to have pretty good reviews here with the x308, but I'm going to do steel lines and a brake flush first and see if that improves the feel enough.

 

Just to repeat ... I have owned many Jaguars ... we have 5 floating around now (family) I can't think of a brake issue .. in the last 25 years!

Jaguar sells the front rotors in balanced pairs for a reason.

I have read many threads about front end shimmy -- brake problems ... etc etc etc. The answers are well know -- the fix is easy.

Spend the extra $200 bucks and get the parts that will solve your problem -- how is changing out rotors and pads saving money.

 

Care to explain what you're talking about?



For what it's worth, I used EBC reds on my X300 XJR (with stock rotors) and they were great. No issues from cold, and stood up to repeated abuse very well.
Matching these with the EBC disks is a good move too. From what I've seen they're pretty high quality and should resist warping if you're hard on them.

Now I have Akebono ceramics on my X308 XJR because I don't take it to the track, and the low dust makes life easier. I also realise that if I did go to a track day they wouldn't be up to the task, simply because they're not designed to.

 

My point is the stock rotors and pads are very high quality -- your not going to have any problems with them. Jaguar did not go off to china to buy the cheapest stuff .. the Jaguar brakes are great .. don't screw up a good thing. I have never had a warped Jaguar rotor.

And the XJ -- forever -- does not like any imbalance at the front wheels. Read up on unsprung weight. That's why the Jaguar rotors are sold in pairs -- a balanced set from the dealer. They don't go to this trouble for no reason.

 

Your described driving style could promote the wheel vibration, does the brake pedal pulse too? if so it could be warped discs, your concern of overheat? Holding a set of hot pads on the disc at one point while at a stop light could warp them. yeldogt is 100% on oem discs but EBC have been producing reliable and consistent kit here in the UK for years, supplying some very fast cars so no real worries, good luck with the install and follow their bedding guide.

 

Don't waste your money. Just get Hawk brake pads. They are infinitely better