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Which Toyota Calipers?

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According to the GMS story one can use the stock MC with the MGB calipers. I think the benefit comes from the piston area. They are as heavy as the Sprite parts, but have a larger swept area and use larger pads, or so I have been told. The Toyota calipers are 4 piston with two different diameters to promote even pressure on the pads, I suspect that they are alloy, but will need to get ahold of a pair to be certain. They are running about $50 to $80 w/o a core, with core I have seen them as low as $31 ea.

As far ar brake bias, I used MGB GT wheel cylinders when I rebuilt the rear drums. That too was part of the GMS budget brake upgrade and is supposed to improve rear braking ability. I agree that dual MC's with a biasing bar would be ideal, but have you priced a Tilton pedal box!!!?
 
I tried a 4 pot caliper on my Midget, that one from a Mazda. The bolt spacing was not the same, but even with just one bolt in place the problem for a Spridget and 4 pot caliper became apparent, not enough room around the lower a frame when at lock with the suspension in "droop" and too tight at the top when under "compression". The MGB caliper does have a little larger bore, but it is still a two piston caliper so isn't any longer than the Midget piece. Since the calipers and pads are designed for a larger diameter disc, you will wind up using just a portion of the pad surface with the stock diameter Spridget discs, but still there should be some improvement. I'd also like to see photos of the Toyota installation on a Spridget.
 
Go to Britishv8.org and look under the "how it was done" section. Check Bob Elwin, #112 for a good photo of the Toyota installed on an MGC. Not a Spridget, I know, but it may help show the compatibility. My case is different since I am installing them on a non-Spridget so I may have more room. I will be going down to pick up a pair in a few minutes and I will stop off at a mail center and get a weight for comparison purposes.


Just got back from my local Parts Plus after picking up my calipers. If you want to lower unsprung weight by using these you will be mightily dissappointed: they each weigh 10.02 lbs. without pads, but with all the other hardware. I seems that there is an EBC pad that will fit: their 7000 series.

Michael
 
I just had them order calipers for a 1982 Toyota 4WD pickup. They are Raybestos remans p/n FRC3465 and FRC3466 for right and left respectively, also maeked on the box is D137 although that may be the pad number. They were $51 + a $30 core charge with pins and clips, but no pads.
 
I'm skeptical, but hopeful. Keep us posted.
 
same here. Hap probably knows better than I, but when you do the big brake conversion using the spitfire rotors and the mgb calipers, dont you have to modify the the rotors and the calipers to get some added clearance (see Bill's comments above)?

I wonder if you would have to do the same to the toyota calipers?
if you didnt then you would need the toyota calipers, spitfire rotors, and an adapter similar to this: https://www.spridgetmania.com/web/Item/HUF175/InvDetail.cfm

As far as the MC goes. I did see a modification that adapted a different master cylinder setup to a slightly modified pedal box. didnt net you a separate MC for the rear brakes or an adjustable bias but still might be an improvement.

https://www.britishcarforum.com/bcforum/u...r_an#Post397898
 
btw,

here is what I found application wise for those calipers

TOYOTA 4RUNNER (1984 - 1985)
TOYOTA 4RUNNER SR5 1985
TOYOTA PICKUP (1979 - 1985)
TOYOTA PICKUP DLX (1982 - 1985)
TOYOTA PICKUP LN56 1984
TOYOTA PICKUP SR5 (1982 - 1985)
 
Trevor Jessie said:
Thanks for the offer but I have that Magazine, I just did not look at it closely, and I assumed that there were adapter brackets needed. I'll go take a look at it.
Click to expand...

It a adapter that goes between the Spridget hub, and the Spitfire rotor to get the spacing correct. I did 5 or 6 of these conversion on the race cars, some go easy enough, other have had be doing plenty of mods to the spit rotors, the end of the shock arm for clearence even slotting or thinning the mounting ears of the MGB caliper, it comes down to variances in the castings, with a few of these conversiuons, i don't how I would have done it without a mill and a lathe.
 
Just an update on the use of Toyota 4 piston calipers on Spridget uprights. The bolt spacing on the Caliper is 2.5" and on the upright it's 2.25". I had my machinist open the holes up and turn hat shaped bushings which we then pressed into place with green loctite and a light interference fit. After that we just redrilled the holes to the correct spacing. The "brim" of the hat is on the inside between the caliper and the upright so it is kept in place by the clamp-up of the mount bolts. We moved each hole 1/8" closer rather than just moving one hole 1/4": these are substantial lugs with a wall thickness of nearly 3/4" so there was a lot of material left. I did not want to try to weld the cast iron caliper. Since I have tubular A-arms there is no interference, so I cannot comment upon the suitability for a stock Spridget. All in all it is not a direct bolt on, yet it is not that difficult a job either and is a cheap way to get modern (ish!!) 4 piston brakes, at least compared to adding Willwoods and a new master cylinder. Unfortunately it will be several months before my car is completed and I can report back about how well they work.
 
How do the pads line up to the spridget disc?

Pictures?
 
I will see how well the pads cover the disc tomorrow, I had to stay home all day today, but will go down to the shop tomorrow. I will try to get pics then, how do I post them here? I am embarassed to admit that I have never tried.
 
Im sure that there is a few ways. I use Photobucket.

www.photobucket.com Upload the photo. (be sure to pic the 640 resolution size) Than open the photo in your album and copy the IMG code all the way on the bottom and past it here in the Reply screen.
 
Wife took the camera to Tucson, she'll be back on Monday and we leave for family Thanksgiving in Florida on Tuesday. But I will try to get to the shop and take some pics, maybe I can post from my laptop in St. Pete.
 
I found a camera, got some pictures and put them into my new Photobucket account. Now I am going to try and post one showing the Toyota caliper as installed on my Westfield 11.

IMG_1104.jpg


This shows how much the caliper is offset to prevent interference with the Sprite wire wheel hub. It looks close on the left side but there is over .040" clearance.
 
This shows how well the Toyota pads match to the Spridget rotor.

IMG_1101.jpg
 
Did you add shims between the caliper and mount? I may be looking at the wrong thing but it looks like a couple washers on the right side.
 
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