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weak 06 sv650 brakes -- need advice
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weak 06 sv650 brakes -- need advice - December 13, 2012, 03:10 PM

got a friend with weak front brakes on her 06 sv. she bled them with new fluid (the old fluid was cloudy) but the feel still is weak imo. i was thinking of rebuilding her calipers and getting her ss brake lines for xmas. but i am wondering if the master cylinders on these bikes are a known weakness. currently, she has a stock set up, with almost 6k on it.

so yeah, i don't wanna do caliper work and install lines to find the main culprit being the mc. (doubtful, i know) any folks familiar with these bike's brakes that can shed some light would be appreciated.


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December 13, 2012, 03:54 PM

At one of his demos, Redlevel taught an easy way to isolate the source of bad lever feel when you have rubber lines. Use a set of pliers to pinch the brake line in-between the master and the caliper to see if the lever feel drastically improves. If it does, the source of the problem is air in the caliper. If not, the source of the problem is the master.


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December 20, 2012, 08:52 PM

Bleed the top end first. That's where most of the issues derive from. Then bleed the bottom.

On another note, SV's don't have the best brakes or the best front-ends for that matter. If he's going to get serious about braking, he may want to consider swapping out with a GSXR front end. It's pretty easy, plug-n-play kind of modification.


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December 20, 2012, 09:40 PM

Quote:
Originally Posted by superchickencornermonster View Post
Bleed the top end first. That's where most of the issues derive from. Then bleed the bottom.

On another note, SV's don't have the best brakes or the best front-ends for that matter. If he's going to get serious about braking, he may want to consider swapping out with a GSXR front end. It's pretty easy, plug-n-play kind of modification.

The brakes aren't brembos. But they are sufficient for a typical SV.

And the fronts are also good enough. If they need to have better feel a set of emulators, springs, and fork oil will set them up well enough to race on. I'd do that before going to the expense and trouble of a new front end. (forks, wheels, brakes, axle, and triple clamps)

Bleed it first. Do you have a suction type bleeder tool? (Maybe $35 at auto store/harbor freight/etc) They can make it easy to get the air out. If not, you can do a crack bleed if you have a friend to help make it easy. It's not difficult. I've rarely seen an SV with really bad brakes that needed anything rebuilt. It does happen, but not that often. Try tapping on everything with the back of a screwdriver. Start at the calipers, make sure nothing can hold trapped air while you do it. Then bleed the system.


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December 21, 2012, 08:22 AM

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Originally Posted by MudDawg View Post
The brakes aren't brembos. But they are sufficient for a typical SV.

And the fronts are also good enough. If they need to have better feel a set of emulators, springs, and fork oil will set them up well enough to race on. I'd do that before going to the expense and trouble of a new front end. (forks, wheels, brakes, axle, and triple clamps)
A lot of times, the first mod that I see guys do to race an SV is to put on a Gixxer front end. I've ridden the two before on the track and the difference it pretty amazing. Of course, the first SV I tried had no mods to the front end, so I may be just speaking out of my arse. But then again, getting a front end on eBay and doing a quick swap may be the better choice.


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December 21, 2012, 08:30 AM

Quote:
Originally Posted by superchickencornermonster View Post
A lot of times, the first mod that I see guys do to race an SV is to put on a Gixxer front end. I've ridden the two before on the track and the difference it pretty amazing. Of course, the first SV I tried had no mods to the front end, so I may be just speaking out of my arse. But then again, getting a front end on eBay and doing a quick swap may be the better choice.
Yeah, and that's expensive and in my opinion doesn't gain you much over a stock front end. Is it easier for adjusting? Yes. Do you need it? No. The improved brakes could probably be covered with a brembo master cylinder.

The stock front end is for street use. You need to slow rebound and tighten the compression. Hard to do on a damper rod fork. Drop in emulators, drill out the damper rod so that the compression is handled by the emulator. Then add thicker fork oil. (20wt for small guys, 30wt for bigger guys) And you should be good to go. 3-4 turns on the emulator. 120mm from the top, spring out, emulator in.

That setup for the front end is great for most folks out there. It's stable, settles well under hard braking, and handles bumps in the track just fine. Save the money and go this route.


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December 21, 2012, 08:35 AM

Swapping a front end from a gixxer onto an SV will be a VERY costly answer to some brake fade. I can't think of a more drastic answer to the problem beside replacing the bike. Although it's an excellent upgrade option I doubt your friend would understand or feel the benefit.

$200 gixxer forks + $100 upper triple + $75 Calipers/Lever/lines + $250 front wheel + $100 if it doesn't have rotors... you see where I'm going... and it isn't even installed or set up for her weight. And after you do that you're going to have to go with a better rear shock. Hell, just buy a new bike...

Braided brake lines. It's a $60 solution that will lead to godlike brakes for an SV. An excellent, cheap upgrade and very simple to do in ones garage with minimal tools or mechanical understanding. Even if it is the master the braided lines were a massive improvement to add anyway.


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December 21, 2012, 08:42 AM

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Braided brake lines. It's a $60 solution that will lead to godlike brakes for an SV. An excellent, cheap upgrade and very simple to do in ones garage with minimal tools or mechanical understanding. Even if it is the master the braided lines were a massive improvement to add anyway.
Sounds like your issue is with air, but beyond that, this. It's always one of the first things to do to any bike that doesn't have them stock.
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December 21, 2012, 10:10 AM

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but i am wondering if the master cylinders on these bikes are a known weakness.
No. They are a very common 7/8 that has been used on a ton of bike models over the years. You can replace with a radial style GSXR one or an R6 Brembo for better feel and the addition of a master cyl bleeder.

Other than that sounds like they just need to be bled properly. Brake feel with improve with SS lines and good pads. As previously mentioned there is something to be gained from improving the springs and oil weight in the forks which can sometimes be confused for brake fade when in reality its a suspension issue.


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