I'm not sure if it was this forum or not but...

I while back someone had a XLS spreadsheet for helping to calc brake master cylinder sizes.
I managed to lose my copy so if someones got this can you let me know?

Thanks,

[Edited on 25/11/07 by Doug68]

I've got it on my work computor, so can only send tomorrow

Cheers

Fred W B

hi,

you can find my brake balance sheet at:

http://www.bib-nakladnistvo.hr/x1000/

there are a few aplications in there, incl. my middy.... I lost the word file with the instructions somewhere, but try it, you should figure it out easily...

Kikiturbo,

Thanks for that, it's not the worksheet I remember but good nonetheless.

Fred,

I'll be interested to see the worksheet you have to compare the two.

Thanks,

yes, this is the sheet I did myself.. I'd also like to see some others just ot compare...

but, it is just basic physics... the only usuall unknown is the weight transfer under braking dependant on the COG height....

Kikiturbo,

Working through the sheet I think I might have found an issue...

The FR. mast. cyl. piston rod force (N) is:

FR. Req. force on the pad (N) * (Front master cylinder diameter (mm) / Total caliper piston area - per side)

But there's 2 calipers on each end of the vehicle so shouldn't the caliper area be doubled in that case? Or have I missed something in the math there?

Attached is my revised version of the XLS I've also added lines to determine the caliper piston movement as I think that there's a minimum safe amount of travel required there, but I'm not 100% sure what that value is, anyone care to suggest a value?

I attach the spreadsheet I have , originally from 'Mike Polan' on here

Cheers

Fred W B

I guess Kikiturbo's worksheet was more correct in its unmodified form.
Used in that way I get quite close agreement between the two workbooks.

The graphs in the second workbook took a bit of deciphering but now I realize the meaning.
A person could stuff about with the combinations in there for hours on end.