Hi all,

Does anyone know of any off the shelf kits, or direct replacements that will convert the standard solid outboard rear disks to vented? Cant seem to find anything on this, just seem to get outboard conversions.

Cheers

 

Beavis,

It should be really quite simple. I think you'll just need to change the calipers, discs and pads. The backplates also have different part numbers but I'm not sure without comparison whether it's really necessary to change the backplates.

Good luck

Paul

 

Think I found the answer: Be useful though if someone could verify for me? Post taken from the below thread by Guido...

I've also e-mailed Fosseway Performance to see if they can do a kit!

https://www.jaguarforums.com/forum/w...-brakes-54576/

I'm new to the forum so apologies for the late post to an older thread. The inboard brakes reduction in unsprung weight may be of benefit in a racing car but has little benefit for a road going car. The cons far outweigh the pros in terms of accessibility and ease of maintenance. The last XJS (AJ6 engine May 1993 to end of production in 1996) used outboard brakes by employing the rear uprights/hub carriers and brakes of the XJ40. Most of the XJS had solid discs but a handful of the last 1996 units had the ventilated discs too. The differential casting was modified to enable two handbrake cable brackets to be mounted where the inboard discs would normally reside. The conversion of an inboard brake IRS unit to outboard brakes is relatively simple although a little ingenuity is needed to fabricate bracketry for the handbrake cables.

You can use the uprights/hub carriers and brakes from XJ40, X300, X 308 and XK8 up until 2001. If you have a 61 3/4" wide rear end then you can simply take the whole brake, upright and half shaft assembly and swap them out - hey presto, instant major braking improvement. Any 1961 - 1986 (Daimler 420DS and XJS to mid 1993) can be easily and cheaply upgraded to 4 piston caliper ventilated outboard brakes in a couple of hours and the benefits far outweigh the disadvantage of reduced unsprung weight. For narrower IRS units - E Type S1, S II, S III, original S Type, 420 just swap the upright/hub carrier assembly and mate to your existing half shafts. I have a couple of these outboard braked XJS IRS units and a couple of inboard brake units as well as some half shaft, upright brake assemblies from an XK8 to convert the earlier units. The car in my avatar is being hot rodded with outboard braked XJS rear IRS, IFS and an XK 6 engine replete with a trio of Webers, so this information is based on hands on experience.

 

Beavis,

I thought you were just asking about converting solid outboard to vented outboard? If I've understood your original post then you just need the calipers, discs and pads off a very late XJS (post 198335) to convert a solid outboard XJS. As mentioned you MIGHT need the backplates, but I'm not convinced yet.

Good luck

Paul

 

Hi Paul,

Yes that is what I want to do - although this also produces more options. I also read whilst looking that the DB7 hub, disk and calliper is a direct replacement - I wonder if that includes the vantage.. Brembo anyone ;-)

Thanks

Richard

 

Ri chard,

It would certainly look impressive! Although, IMO, the rear of an XJS doesn't really need any brake improvements. They only even moved to vented outboard to keep consistency with the setup on the saloons. My solid outboard did over 40k on a set of pads and I only changed them then because they were wearing slightly unevenly.

Having said all that, I'd be intrigued by seeing a set of Brembo's behind those alloys!

Paul

 

Paul - Judging by the prices for the DB7 stuff I'll be going standard x300 vented ;-)