monoblock versus two piece four piston Brembo calipers

Mark R speedracer.mark at
Tue Nov 18 19:52:09 PST 2008

I don't know if a standard dial indicator is sensitive enough.  I know
Stoptech did a ton of engineering analysis (FEA, destructive, etc.) on a lot
of calipers before coming up with their patents.  Specifically, the robust
bridge reduces quite a lot of flex (percentage wise).

I recall from some other testing in the middle to late 90's that the
monoblock Boxster calipers had quite a bit of flex.

For testing to be valid, I'd suggest a control hydraulic source such as a
pump.  That way you can apply an specific force to measure deflection and
come up with some deflection curves.  Remember, even on the same car, you'll
have different forces due to piston size, piston ratio, brake bias, etc.

Mark Rosenkrantz

On Tue, Nov 18, 2008 at 4:23 PM, Big Brake <bigbrakeparts at> wrote:

> There have been numerous discussions about monoblock advantage. Less flex,
> better pedal feel, etc, etc but no real numbers.
> Having mounted two piece Brembo off Cadillac CTS-V and two piece Wilwood on
> my car I am going to measure the flex using a very sensitive magnetic base
> dial indicator similar to this
> .
> May be later I get a hold of a monoblock and measure the same unless
> someone
> already has the data.
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