07 600rr front brake issue - 600RR.net
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post #1 of 8 (permalink) Old 05-12-2012, 03:59 PM Thread Starter
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07 600rr front brake issue

So today I go to ride my bike and all of a sudden the front brakes are giving me trouble. You have to pump the lever (same as you do when you put in a new set of brakes) to build up pressure. If I don't move the bike, the pressure builds up pretty good in maybe 5 pumps. But as soon as the bike starts rolling I lose that pressure. Is my master cylinder bad? the brakes have been bled for a couple months now (and I put on 1000 miles after bleeding them with no issues)

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post #2 of 8 (permalink) Old 05-12-2012, 04:16 PM
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post #3 of 8 (permalink) Old 05-12-2012, 05:25 PM
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any brake fluid on the ground?

Good level in the M/C?

Condition of lines?

It might be a blown mc, take off the rubber boot from the pivot, if there's brake fluid there then you've got a problem.
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post #4 of 8 (permalink) Old 05-13-2012, 12:47 AM Thread Starter
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The rotors should be good, I've been riding it regularly with no issues or signs of warping.

Fluid level is at the max with new fluid. no matter how much I pump the lever the fluid level remains constant. Lines are in good shape, the bike only has 7,000 miles on it. It was, however, tracked by the previous owner (if that matters).

I'll check the master cylinder, thanks for the lead!

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post #5 of 8 (permalink) Old 05-14-2012, 06:51 PM
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Quote:
Originally Posted by Honda125 358 View Post
The rotors should be good, I've been riding it regularly with no issues or signs of warping.

Fluid level is at the max with new fluid. no matter how much I pump the lever the fluid level remains constant. Lines are in good shape, the bike only has 7,000 miles on it. It was, however, tracked by the previous owner (if that matters).

I'll check the master cylinder, thanks for the lead!
by max do you mean top of fluid res. or top/middle of the sight glass with the handle bars in proper orientation?

Your MC shouldn't be blown in 7k unless the fluid in it was totally shot and it would be quite apparent if it were.

If you over fill your M/C it can cause some problems too, just as a heads up!
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post #6 of 8 (permalink) Old 05-16-2012, 01:04 AM Thread Starter
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Turns out that I'm a jackass. The right side rotor is bent after all. Time to find a pair in the for sale section, because one rotor from honda is $380 and a pair of aftermarket rotors is no better...

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post #7 of 8 (permalink) Old 08-08-2012, 01:53 PM
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Quote:
Originally Posted by oldschooldesigns View Post
any brake fluid on the ground?

Good level in the M/C?

Condition of lines?

It might be a blown mc, take off the rubber boot from the pivot, if there's brake fluid there then you've got a problem.
in regards to the pivot going to the reso,is this a common problem w/this master? My problem is that I'd changed the fluid earlier this season...3-4months give or take,&I bled em as ive always done. THAT DAY,the lever squeezed like it's supposed to. the next day,that sucker was mushier than wet bread! Mind you,I NEVER MOVED THE BIKE,nor are my rotors warped. I'd pumped it...NOTHING! i re-bled the system&had air come from the nipple on the master. brake feel came back to normal. If I leave the bike be,the same thing will happen the next day. Sometimes,it'll take more than a couple days to lose pressure,regardless if i ride or not. And again,there's no indication of my rotors being warped.(pulsation in lever,"sound" from rotor..) But,I have been told that this particular master has a problem w/air seeping into this "pivot" over time! Any knowledge of this?

And also,Ive changed crush washers&fresh fluid of the same kind(DOT4)last month. Nothing wrong w/my lines&my pads are at about 80%...

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post #8 of 8 (permalink) Old 08-08-2012, 02:05 PM
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So, what were you not telling us? How did the rotor get bent? :)

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