Has anyone ever put front calipers from a 94 v12 xj40 on to a xjr6?
started breaking a daimler today & noticed the front calipers were a 2piston set-up, something i havent seen before. The xj40 & x300 to my knowledge all came with single piston calipers (apparently not!!)

The hubs seem to be the same as an x300, so is this a good upgrade, or am i wasting my time??
Ive always found braking on my car 'lacking' when REALLY pushing it on an early morning drive!
Any comments/experience would be gratefully received.

 

I took a look on ebay and to my surprise there were one piston and two piston caliper front replacements for my 95 xjr. This is something to think about, this is on my things to do list.

 

Just a general lack of stopping power? Or too subject to heat fade? Or....?

What kind of pads are you running?

Cheers
DD

 

just seem to fade when chasing pesky 'hot hatches'!!

my set up is completely standard at the moment, was going to put in fast road pads, braided hoses fresher fluid etc but bigger calipers, it should take it to another level?

seems a cost effective mod?

Will try to upload some pics of these calipers to see if anyone has come across them or if anyone has tried this before
cheers.

 

I'll begin by saying that I'm not very well versed on brake upgrades so I my be talkin' out of my hat. Just a few thoughts for discussion.....

I'm not sure that four piston calipers would help much with heat fade specifically unless perhaps they carry a larger pad.

Larger rotors would help, it seems, but I don't know of any, off hand, that would fit. I know that drilled & slotted rotors are available....still standard size, though.... but I sure hear a lot of conflicting opinions about them. I think they'd be worth a try, personally. Since you're performance-oriented you'd probably want top-grade....not the bargain basment type which are sold just for the coolness factor of displaying drilled & slotted rotors :-)

Brake pads alone can make a world of difference. I run Akebonos and am very impressed with the grip even when blasting thru the mountain twisties. I sense, though, that I'm probably not as aggressive as you are. I've never been in a position where I tortured the brakes, so to speak.

If you sense that your brake fluid is boiling (which would give a very soft pedal, or even no pedal) then fresh fluid would help, obviously. There are numerous hi-temp, hi-performance choices out there.

Sorry I don't have any solid answers

Cheers
DD

 

This is what im goin on about!

The pads seem to have a larger surface area than standard, with a clean up & braided hoses etc will look pretty cool eh?
Discs are approx 300mm compared to 290mm for standard.

Will have a 'trial fitting' next week see if everything sits nice, any comments??

 

I would upgrade the existing brakes to keep things simple.
Slotted heat-treated rotors and 'track day' pads, then synthetic brake fluid with the higher boiling point.
I did that to my Aussie-built Ford Falcon 7 years ago and the braking under pressure is way better. I have since repeated the process when the brakes needed new pads and rotors. I also made my own brake cooling ducts, but the X300 already has reasonable vents into the wheel arch from the front bumper.

 

Any update on fitment?

 

To maintain front/rear balance, if the rear is different as well, then it would mean transplanting the rear in addition to the front.