Can someone tell me what the thickness of the front rotors should
be? The size when new & the safe minimum for a 68 2+2.
thanks, matt murphy, Illinois–
68 2+2
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A new disk is 1/2" thick. Minimum is .45"
Mike Frank
At 07:10 PM 12/5/2005, you wrote:
Can someone tell me what the thickness of the front rotors should
be? The size when new & the safe minimum for a 68 2+2.
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In reply to a message from Michael Frank sent Tue 6 Dec 2005:
hi
arethe specs the same for the '68 1.5 OTS. I heard there
were 2 sizes
Duncan Paterson–
The original message included these comments:
A new disk is 1/2’’ thick. Minimum is .45’’
Can someone tell me what the thickness of the front rotors should
–
'68 OTS,'70 TR6, '70 Mini Cooper(sort of)
Midhurst, Ontario, Canada
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In reply to a message from Hotdoc sent Tue 6 Dec 2005:
The earliest cars had 3/8th front discs, I believe. I have a pair
amongst my junk spares. And no, they are not reground 1/2’’ discs…
Didn’t the ealriest cars have 3/8’’ at the back as well?–
Peter Crespin 66 2+2 ‘E’
Buxton, United Kingdom
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In reply to a message from Peter Crespin sent Tue 6 Dec 2005:
The size rotor is dependent on the brakes. The Dunlop brakes used
3/8’’ rotors front and rear. When the cars were switched to Girling
in late 1968, the rotors were changed to 1/2’’ front and rear.–
The original message included these comments:
The earliest cars had 3/8th front discs, I believe. I have a pair
amongst my junk spares. And no, they are not reground 1/2’’ discs…
Didn’t the ealriest cars have 3/8’’ at the back as well?
–
Dick Maury , Rebuild Dept., Coventry West, Inc.
Lithonia, GA, United States
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looking for the min. thickness & what the thickness of new 11’’
rotors are for a 68 2+2. my rotors measure 1/4’’ & that seems thin.
I checked the repair manual but couldn’t find the info. Also what
is the going price for new ones.
thanks, matt murphy–
Matt Murphy Illinois 68 2+2
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In reply to a message from 2 + 2 sent Tue 27 Dec 2005:
Matt,
I’m not sure there even is a real spec for that, but 1/4’’ is
definitely way too thin. S1 rotors are 3/8’’ thick, S2 are 1/2’’.
Typical wear limit for most brake rotors is one millimeter, which
is about 0.040’’. You definitely need new rotors.–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
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I’m not sure why this keeps coming up. Your front rotors should be
.50". Minimum is .45". The spec is usually stamped near the hub of
the rotor, or along the edge. You need new rotors. They should be
comparably priced to modern car rotors.
Mike Frank
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In reply to a message from 2 + 2 sent Tue 27 Dec 2005:
Matt,
Yeah, with a '68, make sure which calipers you have, the S1
or S2 versions. They take different thickness rotors.–
The original message included these comments:
looking for the min. thickness & what the thickness of new 11’’
rotors are for a 68 2+2. my rotors measure 1/4’’ & that seems thin.
I checked the repair manual but couldn’t find the info. Also what
–
Jack Terrick 66 FHC
Greensburg, PA, United States
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In reply to a message from Jack T. sent Thu 29 Dec 2005:
I think if they’re Dunlop they’re 3/8th and if Girling 1/2
in.Whatever, yours sound too thin.
cheers
Duncan Paterson–
The original message included these comments:
Yeah, with a '68, make sure which calipers you have, the S1
or S2 versions. They take different thickness rotors.
–
'68 OTS,'70 TR6, '70 Mini Cooper(sort of)
Midhurst, Ontario, Canada
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It has been quite awhile since I posted anything!!!
But this question is straight up this forums alley.
I vintage race my E-Type and it has thicker front rotors
than stock.
The rotors were supplied by a now defunct company but my
impression is they came from some other model
jaguar…same bolt pattern as stock (stock fits) but
thicker.
Does anybody have any idea what rotor had the same bolt
pattern as a 64 Jaguar E-type but thicker?
I am also looking at converting to the Mark 9 calipers and
rotors…so if anyone has a source…please let me know.
Last time I raced I was boiling the brake fluid and finally
cracked my rotor at Sears Point.
I cannot run aftermarket brake improvements nor can I
convert to V12 vented…
anyway…any help would be greatly appreciated!!!–
Cove Britton 64 E FHC 59 Mark I 2001 XJR
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Might be a Mustang rotor. You might run the question by the folks at Essex:
Mike Frank
At 09:36 PM 3/2/2015, you wrote:>It has been quite awhile since I posted anything!!!
But this question is straight up this forums alley.
I vintage race my E-Type and it has thicker front rotors
than stock.The rotors were supplied by a now defunct company but my
impression is they came from some other model
jaguar…same bolt pattern as stock (stock fits) but
thicker.
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
A set of vented disks and calipers from a Series II or
Series III XJ6 may also fit.–
The original message included these comments:
Does anybody have any idea what rotor had the same bolt
pattern as a 64 Jaguar E-type but thicker?
I am also looking at converting to the Mark 9 calipers and
rotors…so if anyone has a source…please let me know.
Last time I raced I was boiling the brake fluid and finally
cracked my rotor at Sears Point.
–
Pete Peterson 70E(193K) XJ40s(88-270K,89-97K, 94-122K)
Severna Park, Maryland, United States
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In reply to a message from Jaguarpete sent Mon 2 Mar 2015:
not allowed in most vintage racing events in the San
Francisco Bay Area…including Laguna Seca and Sears
Point. Must be period correct. So limited to Mark 9 brakes
(which are pretty much what the light weights ran) or what
I run…and I boil the crap out of them.
Donovan etc…can’t run at the Re-Union etc…unless it is
a tribute year.–
Cove Britton 64 E FHC 59 Mark I 2001 XJR
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In reply to a message from Michael Frank sent Mon 2 Mar 2015:
thanks mike…will check–
Cove Britton 64 E FHC 59 Mark I 2001 XJR
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
Cove,
Nice to hear from you again.
You boil the front brakes? Before the rears boil? I’d
have though that to be impossible!
Jerry–
Jerry Mouton '64 FHC 889791 ‘MIK Jaguar’
Palo Alto, California, United States
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
Cove - you can’t run aftermarket improvements but can get
away with period-correct items such as Mk9 calipers and
thicker discs?
I had heard of at least one period E-Type racer who used a
water-spray on the front discs to reduce/delay brake fade.
I don’t suppose your race organisers would allow it though
I did try the same thing on my Proteus C-Type racer at
Killarney in Cape Town a while ago. I suffered severe
brake fade on my fronts (vented discs) during morning
practice so rushed home to cannibalise parts from my
garden irrigation system. A few cable ties, a nozzle
pointing in the general direction of the disc centre and a
borrowed windscreen washer pump soon had something I could
experiment with. I wired the pump into the brake warning
light feed with a separate switch so I could use it only
when needed.
It worked an absolute treat! Close to the end of the race
my brakes started to fade so I flicked the switch. Almost
magically I felt the brake pedal harden and return back to
where it should be. Afterwards, people told me the sight
of clouds of steam from the front wheels as I braked hard
before tight bends was quite impressive 
With a bit of development and sparing use it could have
been quite a useful mod (until the race organisers
cottoned on that is …)–
Neville - http://www.XJ13.eu, XJ13 in-progress 1962 3.4 MK2
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
Cove,
The early E Type came with solid 3/8’’ rotors. The same
rotors were also used on the MK2 and S Type Saloons.
Sometime in late 1967, the S Type was fitted with thicker
1/2’’ rotors and three piston calipers, which carried on in
the 420 (not 420G). The part number is C27024. You will
probably have to modify the pads to fit them with Dunlop two
piston calipers.
Paul–
The original message included these comments:
The rotors were supplied by a now defunct company but my
impression is they came from some other model
jaguar…same bolt pattern as stock (stock fits) but
thicker.
Does anybody have any idea what rotor had the same bolt
pattern as a 64 Jaguar E-type but thicker?
–
PS
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
E-Type S2 rotors are 1/2’’ thick vs. the S1’s 3/8’'. I
believe the bolt pattern is the same.–
The original message included these comments:
The rotors were supplied by a now defunct company but my
impression is they came from some other model
jaguar…same bolt pattern as stock (stock fits) but
thicker.
–
Jack Terrick 66 FHC
Greensburg, PA, United States
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In reply to a message from 1952gmc sent Mon 2 Mar 2015:
MK10 has bigger calipers & pads, thicker rotors. I have a
set of front spindles & calipers. in Fla. Mk10 was out as a
3.8 in 64, so should be period correct. The were steel wheel
cars, so you would probably have to run series 2 E-type
wheel bearings.Not a bad thing since they are bigger.–
GT2
Orlando Florida, United States
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