23mm master cylinder, anyone use the one sold on ebay?? Options

[cobra94563]

here:

http://cgi.ebay.com/ebaymotors/Porsche-911...sspagenameZWDVW

Think it is OK?
anyone selling a spare 19mm?

Thanks. (IMG:http://www.914world.com/bbs2/html/emoticons/driving.gif)

[John]

On our track only car, we are using a 23mm master cylinder.

We have 4-piston (930) front brakes up front, and 914-4 front brake calipers in the rear.

With this much piston area (coupled with the fact that our 19mm MC started leaking) we went with the 23mm MC.

The pedal effort required is not that great, and caution must be taken to not lock up all 4 wheels. The brake performance is excellent.

Prior to running the 930 front calipers, we used 911SC fronts and 914 fronts in the back with a 19mm MC. The brake pedal effort was probably slightly less with the 19mm, but not that noticable. The pedal with the 23mm MC is definately not as firm (hard pedal) as the 19mm was.

In my current 914-6 conversion (911 Carrera fronts & spaced 914-4 rear) I will use a 19mm MC. I should have a good firm pedal with those piston areas and pad sizes.

I would only use the 23mm MC with 930 or bigger calipers (the reason to use such a large MC is to move a large amount of brake fluid).

just my $0.02