Metric caliper definition

[Jube455]

I've seen the term "metric caliper" or "metric brakes" a few times on the forum. Is it just referring to the diameter of the piston? What would make it so different from other systems that would require it labelled so?

 

[81cutlass]

G bodies were the first GM car that had metric bolts. F, B and the previous A bodies had standard SAE bolts.

Dirt track guys (primarily) don't know what a G body is, they call them "metric" chassis. Calling them metric brakes is like calling them G body brakes. Metric=G body

 

[Jube455]

Thank you for the explanation. 🙂

 

[UNGN]

Good thing it didn't take off outside of circle tracks. I don't think I would be a member of the "Metric Forum".

 

[MC96]

Yeah "metric"= g body. Some circle track guys refer to the impala frames and the suspension parts off of them as "Big metric" which can be confusing, even more confusing is while the frames are different the fron suspensions from the 73-77 A bodys, 70-81 F bodys, and the 90-96 (possibly the generation earlier as well) B bodys are the same, and some people refer to "camaro lowers/spindles" as if they are something different from the big metric stuff when they actually are not.

A metric caliper is also called a D154 caliper, Im not sure what you call that number but as far as I know every OE caliper has a number like that. ASE/SAE probably assign it?

The "Big metric" caliper is a D52

The "big metric" thing is funny to me not only because of what I mentioned above, but because those parts mostly predate the use of metric fasteners by GM anyways.