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TR8 rear brake conversion

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M1kem3 Avatar
M1kem3 Michael Rawlins
San Antonio, Texas, USA   USA
I am thinking about converting the rear drum brakes to rear disc brakes on my 1978 Triumph TR8 FHC. Does anybody know how to do that and where I can get the parts for it?

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rainking1958 Avatar
rainking1958 Randy Scott
Green, ohio, USA   USA
1977 MG MGB "Kermit"
1979 Triumph Spitfire 1500 "The Runt"
1980 Triumph TR7 Drophead
1980 Triumph TR8    & more
Find a rover SD1

bowen6951 Avatar
bowen6951 Gold Member rob bowen
Fontana, California, USA   USA
Go to "Brakes" posted 1/10/14 by ub401725. Good info by several people.

http://www.triumphexp.com/phorum/read.php?3,932917

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TR8todd Avatar
TR8todd Todd Kishbach
Mass, USA   USA
1977 Triumph TR7 "Rally Fraud"
1978 Triumph TR8
1979 Triumph TR7
1980 Triumph TR8    & more
Sd1 had rear drums. In fact it had the same rear end as the tr8 with slightly longer axles and a 5 on 5 bolt pattern. There isn't a kit available that I know of, but its fairly easy to do. First off you need to figure out what calipers you want to use. You will need ones that have a provision for a mechanical ebrake. You could add a driveshaft ebrake, or adapt the hydraulics by adding a master cylinder to the hand brake, but both of those options are overcomplicated. Grab a set of VW MK3 aluminum rear brake calipers. They have a lever on them that you can attach an ebrake cable to. You just need to fabricate a bracket to anchor the end of the cable. The VW calipers are cheap, and they are aluminum so that makes them cool. Now find a four bolt rotor that you can drill four more holes in that fit the TR bolt pattern. Miata, Corvette, and now Willwood, have similar rear calipers, but those aren't cheap. After you machine the new bolt holes and maybe even the center hole, slide it on, position the caliper over the rotor and fabricate a bracket that bolts to both the caliper and the axle flange.

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
ok
we use rear disc calipers from the rover 800 series
or sterling as they were known in the USA. there was also a Honda model that was a
joint venture as the 800 range and had the same brakes.
ARonline is the place to research that.
now in my parts book the MG F TF models also use the same calipers and pads
the discs rotors from a ROVER 25/45 MG ZR/ZS range have the same pcd as the tr7/8
brackets to fit them you will have to make yourself
MG ZR/ZS has 2 different size rear brakes
yes just checked the apec book
they are 240mm
and the larger 260mm
ZR/ZS discs have the same PCD stud paten 100mm 4in size as TR7/8
DONT KNOW ABOUT center hole and offset
but visit apec brakes on line where all details can be seen online

TR8todd Avatar
TR8todd Todd Kishbach
Mass, USA   USA
1977 Triumph TR7 "Rally Fraud"
1978 Triumph TR8
1979 Triumph TR7
1980 Triumph TR8    & more
That's great except for the fact that none of that stuff exists on this side of the pond.

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
there's always ebay
lots of stuff there
postage might be high.
better with couirer

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nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
MG ROVER sold there cars in Canada
that me be a more practical source of parts for you

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
brain has just clicked in to overdrive
the rover 45 mgzs platform was a joint Honda project
cant say if it was a legend or a civic?
if you do some digging on a friends webb site ARonline keith has the history of the british motor industry there
if you read up on the MG ZS rover 45 development it will tell you what Honda/ acura models are the same
and there is you home ground USA parts supply,

good hunting

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dhuddleson Avatar
dhuddleson David Huddleson
Manotick, Ontario, Canada   CAN
MG Rover sold none of those cars over here in Canada. The Rover Sterling (825 & 827) were USA only. None of the smaller Honda-based Rovers came here. The Rover Sterling is (mostly) equivalent to Acura Legend sold in North America. Only Jaguar was left from BL after 1982 in Canada.

Oh, and PCD of 4x100mm is no use to us, as TR7/TR8/Spitfire/GT6/Herald/many Lotus/Montego/MGF etc... all use 4 x 3 3/4"

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
that small pcd is what the MG F TF used were they sold in canada

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
yes MG TF on apec braking site 95.3MM APROX 3 3/4IN

sorry my works derived tr8 all use ford escort pattern pcd at 100mm

discs here in the uk are plenty full and no problem for me to source
if you want I can do some shopping for prices. etc
if you look in to getting them collected from the uk
customs I have no idea but they will be used parts.
with new rotors and pads . I have a trade account for spares so a discounted price will cut costs.

nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
when I find my camera I will down load photos of the finished axle on the red shell ( new build)in the photos
this is built to the works rally car spec with AP racing calipers and discs


Attachments:
rear axle left.JPG    48.2 KB
rear axle  left.JPG

PICT0599.JPG    38.7 KB
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nightfire25 Avatar
nightfire25 kelvin lambert
swansea, wales, UK   GBR
here is a photo of the axle on OOM512R the first works rally car used for BBC grandstand programme (UK SPORT}
on esgair dafyd run against the top works rally cars of other manufactures

I collected this car from Special tuning MG factory Abington, in November 79
and reshelled it into a new safety devise body shell about a year later


Attachments:
tr8 axle enlarged.JPG    30.6 KB
tr8 axle enlarged.JPG

Peter Evans Avatar
Neath, Wales, UK   GBR
Hi I'm from the Swansea valley building another replica have you still got yours I'm interested in knowing how to do rear disc conversion and how to adapt the tr h/brake cable to calipers, also how did you change your PCd to 100pcd hope you can help and maybe I could call to see your car and take some pics I've had a totally rust free she'll from Australia never been welded now 4.0v8 my contact number 07976583243 thanks peter


Attachments:
image.jpeg    47.2 KB
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