replacement master cylinder

[Celt]

hi peeps

can anyone explain what advantage this would make to the standard 05.

5/8 diameter front brake master cylinder for extra

Performance with 6 piston calipers or increase standard performance

seems to say that you would get better braking but how and is it worth £54.99

here's the link 5/8 front brake master cylinder

[Speed3]

You only will get better braking if you go to six pot calipers. I've got a brand new 5/8 M/C in the bag that I will sell for 60 U.S. if yer interested.

[Celt]

if it doesnt improve the standard then no not interested. sorry

[Speed3]

I bought the MC and an extra line from Sky King, and then did some research. I found an hydraulic engineer online who explained it to me so I could understand it. I installed the extra line, but kept the 14mm MC. If anyone is going to Beringer 6 pots let me know...

[kuhlka]

6-pots? Lol, all you need is Double-H pads and stainless lines and you should be good to go. The bike stoppies effortlessly for me. I'd rather not have EXTRA stopping power that might cause a reverse loop, lol. Trust me, spend <$200 on new lines, fittings, Double-H pads and some fluid and you'll be amazed by how well those 4-pot calipers do.

That reminds me, I need to bleed my brakes. It seems I still have a few bubbles in there making them mushy.

[rat]

A 5/8” master cylinder will give you increased resistance at the lever because it’s pushing the fluid through the same bore tube as before, and an increased pressure on the pads at the caliper end. Useful if the lever feels “soggy”, though I’m not sure if the ‘05 comes with braided lines. If not, that would be my first upgrade...

Theoretically, it shouldn’t make any difference whether you’re running 4 or 6 pot calipers; the larger piston in the 5/8” cylinder just pushes more fluid down the line. The standard master cylinder is 3/4”, so it’s not a *major* increase.

If anything, you’ll lose a bit of braking “feel”, but gain more bite at the pads, so you’d just need to re-learn your braking technique.

[rat]

Ok, I may have given some misinformation there. The bore on my master cylinder ('00 trip) is given as 14mm (just over 1/2") so a 5/8" bore is a quite a large increase in diameter. I'm guessing the '05 has a similar setup.

Check out this thread on the t595.net site for more insight.

[Speed3]

The bore of the 5/8 m/c is bigger, so it takes more lever movement to push the fluid. So if you want crisp braking with 4 pots, leave the stock master cylinder on there. My bike stops awesome with the EBC HH pads.

[ This message was edited by: Speed3 on 2005-07-05 19:44 ]

[rat]

Nope, sorry. The lever will travel more or less the same distance, but it’s pushing a larger piston displacing more fluid down the same diameter pipe. The net effect is that more force is required at the lever, but the braking force at the caliper is increased. For the same lever movement, you increase the fluid pressure on the back of the pads because you're pushing more fluid (duh!). Basic physics, I’m afraid...

It’s akin to using a sink plunger with a larger diameter, or the snowshoe effect.

[Celt]

oh dear what have i started. im not very gifted when it comes to mechanical things but i think i will leave it as standard until i get it back from service as it will have been bled.

does the 05 have steel braided lines???

it looks like it has some which are plastic coated but not 100%