[xj] Brake disk calipers and disk sizes

Hi everybody, I hope it’s OK to join in your forum but I’m after
some info on XJ6 front calipers.

I have a 1968 Plymouth Satellite which has Bendix disk brakes.
These were only fitted for a year or two and parts are just about
impossible to find.

I want to fit calipers from something that is more readily
available in the UK and for which I can get pads, seals etc.
Landrover Defender calipers would fit but the disk diameter on my
car is too big. I’ve been told that XJ6 calipers might do the
trick, so I wonder if any of you guys could advise me.

The mounting hole centres are 3 1/2’’ apart, the gap in the caliper
for disk clearance is 1’’ wide. The disks are 11’’ diameter and are
vented, so they are 7/8’’ thick.

Do these dimensions sound similair to any XJ6 disk brake systems?
I’d be grateful of any advise.

Thanks.–
Tyrefryer
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Tyrefryer;
The bolt mounting holes in the xj6 caliper is 3 1/2 inches, the rotor gap
in the caliper is 1 3/32 inch, the disc diameter is 11 1/8 inches.
This is for the front caliper.

Ken
“If I can’t fix it, it don’t get fixed”
1990 xj40 vdp
1983 xj6 III===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from kweimer sent Thu 6 May 2004:

Hi Ken, thanks very much for that. Is that for all years or a
specific period of manufacture.

Thanks again, Martin.–
Tyrefryer
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In reply to a message from kweimer sent Thu 6 May 2004:

BTW, is there anybody breaking XJ6s in the Bedfordshire area?–
Tyrefryer
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In reply to a message from Tyrefryer sent Thu 6 May 2004:

Have a word with Peter Neale of Beaverwood Jaguar Services in
Milton Earnest 01234 824186 he breaks XJ 6’s & I have found him
very helpful & reasonable prices.–
The original message included these comments:

BTW, is there anybody breaking XJ6s in the Bedfordshire area?


Keith Turner '79 XJ6 based Aristocat, , '81 3.4 XJ6
Swansea, United Kingdom
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Tyrefryer;

I can only speak for the xj6 III (1979 to 1986), although I believe the same
caliper is used on the Series II also…I measured a caliper that I had
on the shelf as a spare part and got the diameter of the rotor out of the
xj6 III factory shop manual.

Ken
“If I can’t fix it, it don’t get fixed”
1990 xj40 vdp
1983 xj6 III===================================================
The archives and FAQ will answer many queries on the XJ series…
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Tyrefryer;

I’m in USA, so don’t know about breakers in your area.

Ken
“If I can’t fix it, it don’t get fixed”
1990 xj40 vdp
1983 xj6 III===================================================
The archives and FAQ will answer many queries on the XJ series…
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Tyrefryer wrote:

I have a 1968 Plymouth Satellite which has Bendix disk brakes. These
were only fitted for a year or two and parts are just about
impossible to find.

I want to fit calipers from something that is more readily available
in the UK and for which I can get pads, seals etc. Landrover Defender
calipers would fit but the disk diameter on my car is too big. I’ve
been told that XJ6 calipers might do the trick, so I wonder if any of
you guys could advise me.

The mounting hole centres are 3 1/2’’ apart, the gap in the caliper
for disk clearance is 1’’ wide. The disks are 11’’ diameter and are
vented, so they are 7/8’’ thick.

Do these dimensions sound similair to any XJ6 disk brake systems? I’d
be grateful of any advise.

It’s 11 3/32" (24,4mm) on all xj’s front, but the disc thickness is
1/2" on SIs, and 1" on the latter ones. The slightly thinner discs on
the Plymouth is likely immaterial as is the slight difference in disc
diameters. However, even if bolting holes are similarily distant (they
are) it doesn’t mean they can be cross-fitted. The Plymouth’s fronte
set-up may be different enough to cause problems. You also have to
check the fixing bolts diameter, though likely similar.

More important is to check the respective calipers piston area, as
that is very relevant for brake ballance front/rear. If the piston
areas are the same brake ballance on the Plymouth will not be
affected, but if different it will be a brake problem, unless you also
fit the Jag rears to equally suitable rear Plymouth/Jag interchange…

Unless your original calipers are damaged beyond repair I suggest you
overhaul them as a better solution…

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
The archives and FAQ will answer many queries on the XJ series…
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In reply to a message from Frank Andersen sent Fri 7 May 2004:

Thanks Frank,
unfortunately parts are no longer available for this caliper, I
haven’t even been able to locate pads. The car is a race car so
originality isn’t important and I’d rather give the calipers to
somebody who has a numbers matching car for rebuild.

Thanks.–
Tyrefryer
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In reply to a message from Tyrefryer sent Fri 7 May 2004:

Hi,

It's prolly worth noting that series one cars had 3-piston 

calipers & solid discs, whilst series Two and onwards had 4 pots
with vented discs. As a racer you will no doubt be looking for the
vented variety, but if its any good to you I’m in northampton and
could offer you a borrow of an old scrap 3 piston type just to get
some idea of dimensions etc.

Cheers,–
Rob Hod '73 Daimler Sovereign MOD
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The archives and FAQ will answer many queries on the XJ series…
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