Front Brake - SV1000 Portal
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post #1 of 4 (permalink) Old 28th July 2018, 02:10 PM Thread Starter
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Front Brake

Hi Guys, I'm having a problem getting a good front brake feeling, on my last track day the lever was coming back to the bar, although the brakes stopping power was good, I thought it might be worn pads, when I removed them they still had a lot of meat on them, I replaced them anyway with SPSdc, I already had a Radial master cyl fitted from a 650SV, I've bled the system every way possible, not any air bubbles in sight, so I fitted another Radial cyl from a ZX10, again bled the system again no air in it, but the lever still comes back to the bar, the brake does lock the wheel at half movement but I can pull it further to the bar, can anyone help me with this annoying problem PLEASE,

thanks for any help

Froggy.
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post #2 of 4 (permalink) Old 4th August 2018, 05:07 AM
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Originally Posted by old gits racing View Post
Hi Guys, I'm having a problem getting a good front brake feeling, on my last track day the lever was coming back to the bar, although the brakes stopping power was good, I thought it might be worn pads, when I removed them they still had a lot of meat on them, I replaced them anyway with SPSdc, I already had a Radial master cyl fitted from a 650SV, I've bled the system every way possible, not any air bubbles in sight, so I fitted another Radial cyl from a ZX10, again bled the system again no air in it, but the lever still comes back to the bar, the brake does lock the wheel at half movement but I can pull it further to the bar, can anyone help me with this annoying problem PLEASE,



thanks for any help



Froggy.


Are we talking about stock SV calipers?
What fluid are you using?
Have you actually pulled the calipers apart to make they donít have goo in them?

I know you said there is no air, but it sure sounds like there is still air some where trapped or old gross fluid that has not been flushed out or calipers not properly serviced.

I do a a bunch of brakes for street and race bikes. I often get them in the same state as you described. And it is usually air.

I compress all pistons into calipers as far as they will go forcing fluid back into the reservoir. I pump calipers back up at the lever. Repeat three times.

Now, crack the bleeder on one caliper and squeeze all the pistons back in. Pump caliper back up. Repeat.

Now do the same for the other caliper. Making sure at all times you do not run the reservoir out of fluid.

Now if you have a radial master, position it so that the bleeder is at the high point, and bleed at least three times. If you have an axial master you need to position it tilted so the ball end of the lever is higher than the piston by about 2 inches and wiggle the lever in and out several times to burp it. Place as normal and squeeze several times very hard and hold for about 5 seconds.
Burp master again. Repeat several times.

Now bleed at each caliper once or twice.

Several of the old six piston calipers would not ever bleed out properly unless you did this.

This also assures the old fluid in the lower piston sections gets pumped out of the calipers.

-ms
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post #3 of 4 (permalink) Old 4th August 2018, 11:55 AM
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I had the same issue with my SV but not quite as bad. I rebuilt the calipers and changed the fluid. This didn't help. I did a bit of searching and it turns out a lot of people have this issue. One suggestion I found was to keep the brake lever squeezed overnight. This definitely made a difference when I did it. I still feel there's a bit too much free play but it's better. Give it a try. It's easy enough.

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post #4 of 4 (permalink) Old 14th September 2018, 03:38 PM
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Another alternative is to remove all brake fluid from the front system. Take a syringe and fill from the bottom up. Do one leg at a time until the fluid just appears in the master cylinder on the first leg, then do the other leg to increase the level of the reservoir on the handle bar. Top up where necessary.The pressure required to fill each leg with fluid will force any air out of the system through the reservoir. Take care that you don't over fill the reservoir.
If the SV is the same as my V-Strom, you have a little wheel on the front brake lever, that can be adjusted to set the travel or distance from the handle bar when the lever is activated.
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