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> 19 or 23 bore master cyl?
broomhandle
post Jun 18 2012, 02:09 PM
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19 or 23 bore?

I have a 70 with stock brakes.

I was thinking 23 but unsure if I have to change anything.

I know 19 is a direct fit, just wondering 23.

Any thoughts?
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6freak
post Jun 18 2012, 02:23 PM
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why spend the money... car`s not fast enough to require more brakes..if there working proper there all you need ..JMO
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yeahmag
post Jun 18 2012, 02:30 PM
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Stock brakes = stock MC
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SirAndy
post Jun 18 2012, 02:31 PM
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QUOTE(broomhandle @ Jun 18 2012, 01:09 PM) *
19 or 23 bore?
I have a 70 with stock brakes.
I was thinking 23 but unsure if I have to change anything.
I know 19 is a direct fit, just wondering 23.
Any thoughts?

You will *not* be happy with stock brakes and a 23mm MC.

The 19mm is the better choice over the 23mm and the stock 17mm would be even better yet.
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Eric_Shea
post Jun 18 2012, 02:49 PM
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19. I would never put a 23 on stock brakes.
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broomhandle
post Jun 18 2012, 03:04 PM
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23, 19 and 17 are the same price. Everybody always talks about a 19.

So then 19 vs 17?

It's only 2mm... I would think that much bigger bore would help.
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a914622
post Jun 18 2012, 03:46 PM
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Ya but when you talk bores and fluids half again bigger = 4 times the flow rate. So a 1.5 dia will flow 4 times the rate of a 1.0 dia. Go 2mm bigger on a 17mm and the flow rate is noticable.

so i would stay with a 19mm


jcl
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yeahmag
post Jun 18 2012, 03:49 PM
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You are thinking about this backwards. The smaller bore makes it easier to apply the brakes at the expense of pedal travel. Going up to a 19mm bore will make the brakes "feel harder", but also makes it so you have to push harder to stop. At 23mm with stock brakes you would be hating life and having to push like a formula car to get the thing to stop.

QUOTE(broomhandle @ Jun 18 2012, 02:04 PM) *

23, 19 and 17 are the same price. Everybody always talks about a 19.

So then 19 vs 17?

It's only 2mm... I would think that much bigger bore would help.
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SirAndy
post Jun 18 2012, 03:50 PM
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QUOTE(broomhandle @ Jun 18 2012, 02:04 PM) *
I would think that much bigger bore would help.

Help with what exactly?
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yeahmag
post Jun 18 2012, 03:51 PM
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"Help" going through the first stop sign after installing it...
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mepstein
post Jun 18 2012, 03:52 PM
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Think of a lever. The bigger mc is like having the fulcrum close to you. You move more fluid but it takes more effort. Push the fulcrum away from you and you have more travel but the effort is reduced at your end and multiplied at the far end.
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ChrisFoley
post Jun 18 2012, 04:12 PM
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I would like an 18mm M/C for stock brakes.
The 17mm has a little too much pedal travel and the 19mm has a little too much pedal effort.
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yeahmag
post Jun 18 2012, 04:34 PM
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Did they ever make one? Reason I ask is I swear mine is marked "18" on the outside.
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euro911
post Jun 18 2012, 04:42 PM
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If you can get a 17mm ATE for the same price as a 19mm, I'd jump on it.

Not sure about FTE's quality yet (IMG:style_emoticons/default/confused24.gif)
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Valy
post Jun 18 2012, 04:54 PM
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17mm is perfect for the stock brakes.
The 19mm requires 25% more leg force to stop like the 17mm stops.
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mrbubblehead
post Jun 18 2012, 05:32 PM
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its to bad there arnt rebuild kits available....
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ArtechnikA
post Jun 18 2012, 05:43 PM
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Interesting fact - all MC's are really SAE sizes.
What we call "19mm" is really 3/4"
"17 mm" is 11/16"

And they go up and down in 1/16" imcrements.
Which is why there is no 18mm...
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markb
post Jun 18 2012, 05:53 PM
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QUOTE(Valy @ Jun 18 2012, 03:54 PM) *

17mm is perfect for the stock brakes.
The 19mm requires 25% more leg force to stop like the 17mm stops.

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yeahmag
post Jun 18 2012, 05:56 PM
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I found another reference to an 18:

http://www.914world.com/bbs2/index.php?showtopic=33154
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broomhandle
post Jun 18 2012, 06:31 PM
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QUOTE(yeahmag @ Jun 18 2012, 02:49 PM) *

You are thinking about this backwards. The smaller bore makes it easier to apply the brakes at the expense of pedal travel. Going up to a 19mm bore will make the brakes "feel harder", but also makes it so you have to push harder to stop. At 23mm with stock brakes you would be hating life and having to push like a formula car to get the thing to stop.

QUOTE(broomhandle @ Jun 18 2012, 02:04 PM) *

23, 19 and 17 are the same price. Everybody always talks about a 19.

So then 19 vs 17?

It's only 2mm... I would think that much bigger bore would help.





That makes sense. The brakes feel good. The MS just leaks... Bad.

I remember awhile ago everybody was saying go 19mm and 320 brakes....

But I think a new rebuilt 17 would be just fine. It's a daily driver. But I do like really sensitive brakes.....
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