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I'm doing this for my Healey since it uses the same Calipers as the TR6.
The details are:
The parts needed and the relevant Toyota references are:
Left Caliper: Toyota P/N 47730-35080
Right Caliper: Toyota P/N 47750-35080
Pads: I bought these through an after-market supplier and do not have the Toyota P/N, but any good parts store should be able to supply them. The original pads are on the left, the 4-pot ones on the right, to give an idea of the increased area.
Top Shims, springs and pins will be needed unless you get a fully kitted out caliper, and the source I found wasn't able to supply such a thing. One of the calipers came with pins, one did not.
There are two types of shims- plain and "vented" , the vented go next to the pad, the plain against the caliper.
The springs go across the caliper to tension the pads, and a retaining clip goes between the pins. The required information:
Shims 1: Toyota P/N 47744 (set of 4)
Shims 2: Toyota P/N 47745 (set of 4)
Springs 1: Toyota P/N 47748 (set of 2)
Retaining Clips 2: Toyota P/N 47748A (set of 2)
Pins: Toyota P/N 47748B (not sure about the "B", the copy was not as good as it could have been, the P/N is for one)
These do not appear to be readily available from anyone but Toyota in the UK- few of these vehicles were imported to the UK though I'd expect they'd be far more commonly found in the USA.
Its also possible to obtain a kit comprising all the shims and tensioning springs that is a little cheaper than buying them individually.
The VTR reference describes the source vehicle as Toyota gasoline powered pick-ups 1979-1983, my vendor listed these as coming from Toyota Hi-Lux pickups 89-97 and Toyota 4 Runners from 1993 on.
The costs:
Calipers (from aftermarket supplier): ~ÂŁ75 each + core charge of ÂŁ20
Pads (from aftermarket supplier): ~ÂŁ20
Shims, Springs & Pins (from Toyota): ~ÂŁ50
Hardware- in order to mount the calipers a little tinkering is necessary. The calipers come with metric mounting holes, the stub axles have imperial threads. A hybrid bolt is available that has a 12mm shaft to fit the caliper and 7/16 UNF threads to fit the stub axle. This was used on very late model TR6s. It is available from Rimmer Brothers
www.rimmerbros.co.uk, and the relevant part number is: 158668 - It is listed under TR6 brakes as the mounting bolts for the Girling type M16P caliper. The cost was ÂŁ3.87 each.
This shows a trial fit with the bolts shown. I had to trim the shield to allow clearance for the larger calipers.
First Caveat: a trial fit of the bolts shows that they're are almost right for the Healey, I'd think they'd be exactly right for their intended purpose on a TR.
I've seen the calipers on sale on e-bay and a set could be bought for around $30 when I looked. The pads, shims and other bits could be bought on e-aby too for something like $20 as I recall.
I went with new and dealer-sourced components because there's no real market of these used here in the UK- I needed to be able to take the stub axles in and make sure it all lined up right for my Healey, and it seems to do- I just need to put it all together....
Second Caveat: The VTR article was written by a racer who would presumably regulalrly check his brakes. The stock disk is 1/2 inch, the Toyota caliper uses a 20mm disk (I think). I've a concern that the pistons will extend further than their normal range, so I will make a set of additional shimes to fit under each pad to make up the difference. I've not yet done this, but it should help everything fit together happily, once I do get around to putting it all together again.
I hope this helps....
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