On Sun, 8 Feb 1998, Jim Jones wrote:
> Have had no luck checking the usual references, so I want to throw this out
> to the list. Have two different styles of front calipers. They differ in
> the way the dust boot connects to the body of the caliper. One has a lip
> which inserts into a slot in the bore the piston slides into. This one
> appears to be stock TR4A. The other requires a boot which slides over a
> lip which is an extension of the bore and is held in place by a wire spring
> clip. I can't seem to find a picture of this one. Is it from a Triumph?
> If so which one? I'd like to get a set of boot for it.
TR6 calipers are virtually the same as TR3B/4/4A/250 calipers; the pistons
have a different dust boot assembly. It's my hunch that you have got a
TR4A caliper and a (later) TR6 caliper.
I think the inside works are identical. If you're a purist, buy a TR4A
caliper- if not, buy a TR6 rebuild kit. The spring-retained boots were
used on post-1972 cars. If I am wrong, someone please correct me!
There is also a difference in the pistons themselves; early ones have a
very thin groove to hold the rubber, and later ones have a wider (1/8")
groove.
I put later TR6 caliper pistons in my TR4 with no ill effects (so far)
You may also find that the TR6 caliper has some metric fittings.
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