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inboard brakes (Read 1232 times)
sidely
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inboard brakes
05.04.2012 at 23:29:18
 
So call me an idiot but I purchased a 1992 Convertible 8 years ago and didn't know until last year that it had rear inboard brakes. Indeed, I'd never known that any car had inboard brakes!
They must be sorted and I'm told by all and sundry that this means dropping the rear axle, a three day job. Is this correct and are there ways around it? The brakes are good at first then start to stick on and overheat. Are there any other ways of sorting these brakes?
And why on earth ARE they inboard ?!!
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Brian
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Re: inboard brakes
Reply #1 - 06.04.2012 at 00:12:15
 
Sidely,you need to buy a worksop manual, it is possible to remove and o'haul the rear calipers without removing the rear cage, but it is not the best of jobs. The reasopn for inboard brakes is to reduce the unsprung weight, which in turn improves handling, think alloy wheels !!
   All the best Brian Wink
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1993 3.2 XJ40 & 1997 3.2 X300 executive
 
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almcl
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Re: inboard brakes
Reply #2 - 06.04.2012 at 07:40:33
 
It doesn't take 3 days to get the cage out, if you do decide to drop it, unless you are very unlucky with separating the exhaust pipes. 

The awkward bit (for me) are the handbrake calipers, remounting those with the cage in-car is a laugh a minute... but it is doable but can be fiddly.
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'05 X 350 TDVi - his
'05 X type Est 2.0 D - hers
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sidely
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Re: inboard brakes
Reply #3 - 06.04.2012 at 09:36:46
 
Thanks for advice to date. Perhaps I should have added that I don't know one end of a spanner from the other and have to trust pros. Obviously, I use a local specialist or two, not dealers, but all of my local guys indicate axle out and lots of bucks.
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Jacqueline
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Re: inboard brakes
Reply #4 - 06.04.2012 at 11:03:00
 
I was looking at having mine done a couple of years ago. Was told it was a 4 hour job and would cost about £500 for new brake disks and pads.

Ultimately only the pads got changed and they could be done without dropping the rear subframe.

I dont think this is a job to be done on jacks on a driveway though. Might be worth getting a specialist Jag mechanic on the job with a ramp and the right tools
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Jacqueline
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Re: inboard brakes
Reply #5 - 06.04.2012 at 11:03:37
 
Where do you live Sidely?
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2jagsDoug
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Re: inboard brakes
Reply #6 - 06.04.2012 at 15:35:18
 
If doing the "cage out" routine....willingly or unwillingly....take advantage of the situation and replace anything questionable at the same time. Brakes discs for sure, but also stub axle seals if needed, cage mountings, and so forth.

Cheers
DD
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Doug Dwyer
Longview, Washington USA
1995 XJR
 
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sidely
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Re: inboard brakes
Reply #7 - 06.04.2012 at 22:49:12
 
In reply to Jacqueline, I live in Derbyshire. Didn't think your 1987 model had inboards, thought they were only on some early 90's facelifts........?

Thanks for your comments.
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2jagsDoug
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Re: inboard brakes
Reply #8 - 06.04.2012 at 23:09:17
 
sidely wrote on 06.04.2012 at 22:49:12:
In reply to Jacqueline, I live in Derbyshire. Didn't think your 1987 model had inboards, thought they were only on some early 90's facelifts........?

Thanks for your comments.



Other way 'round.

They were all inboard until around 1993-94. I can't remember the cut-off but I think 1994-96, in "USA model year terms", had the outboard brakes.

Cheers
DD
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Doug Dwyer
Longview, Washington USA
1995 XJR
 
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almcl
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Re: inboard brakes
Reply #9 - 06.04.2012 at 23:11:46
 
sidely wrote on 06.04.2012 at 22:49:12:
Didn't think your 1987 model had inboards, thought they were only on some early 90's facelifts........?


AS Doug says, in-board brakes were fitted to all XJSs up until '93 when they switched to Teves.  The cage on the XJ is interchangeable with the Series XJ ones. Which all had in-board disks too.
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Jacqueline
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Re: inboard brakes
Reply #10 - 07.04.2012 at 14:22:52
 
Depending where in Derbyshire you are, I dont know what specialists you are going to but I use Bell Lane Garage at South Kirby nr Pontefract 01977 651100

Cannot fault them and have been using them for about 7 and a half years now

http://www.jagrepairs.co.uk/

I used to living in Belper and Wirksworth in Derbyshire going back a few years but have gradually migrated north from there
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Chris Dixon
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Re: inboard brakes
Reply #11 - 08.04.2012 at 10:33:41
 
Masochist that I am and wanting to save £1500 labour I did the job myself last year. First I tried to do it with the cage in situ, then problems getting at the driveshaft bolts with the car on axle stands meant it was easier to drop the cage. No mean feat with just a small trolley jack but fortunately I have a wide garage and was able to get it out sideways.

Anyway I note the OP needs a garage to do the job so just a comment that (assuming you need new discs) if you find one that knows what they're doing with a lift with chassis supports (as opposed to a drive on ramp that will get in the way) the job can be done with the cage in place, by disconnecting the driveshafts from the discs and the lower damper units from the lower suspension arm.

One problem with dropping the cage is invariably there will be other jobs to do (before deciding have someone check out the tops of the radius arms, their mountings and the surrounding area including the rear of the sill and the front of the wheel arch for rust) and even if not its a great opportunity to rub down and repaint the cage and other bits you'd never normally get at. But if there are no other issues then I'd do it in situ next time.

Talk to Ward Engineering, they are in Colchester so not next door but they do this job all the time and are very helpful on the phone and they may be able to recommend a specialist in your area.

[EDIT: whoever does the job make sure they give you either an all up price or let you know parts prices in advance, as prices can vary quite a bit between suppliers]
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95 XJR Manual
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Brake-buster
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Re: inboard brakes
Reply #12 - 12.04.2012 at 15:55:23
 
almcl wrote on 06.04.2012 at 23:11:46:
sidely wrote on 06.04.2012 at 22:49:12:
Didn't think your 1987 model had inboards, thought they were only on some early 90's facelifts........?


AS Doug says, in-board brakes were fitted to all XJSs up until '93 when they switched to Teves.  The cage on the XJ is interchangeable with the Series XJ ones. Which all had in-board disks too.



the French Teves ABS system was introduced to XJS's in 1989 , and has nothing to do with the outboard brakes ,

inboard brakes are actually better for the ride of the car, as it negates the un-sprung load on the end of the drive axle,  outboard brakes were fitted due to the complex servicing of the inboards, and was a more ' modern ' idea as the years went on

BB Wink
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1989 XJS V12 Sportspack in white, 1999 XJ8 4ltr Sovereign sold to fund XJS restoration,
X-Type saloon for the good wife
 
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