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Old 08-28-2019, 01:54 PM   #1
Big_Panda
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new master cylinder?

So the brakes on my 2004 VFR800 are pretty mushy.

I ordered new rotors because they have been pulsing pretty good and I'm sure the rotors are warped. I mic'ed em and they are just barely at minimum spec thickness. When I install the new rotors I'll flush the fluid in the system with brand new fluid. But I was just wondering if the mushiness might be due to the master cylinder needing to be replaced?

I can squeeze pretty much as hard as possible and the bike never gets to ABS activation. I figure its either the master cylinder needing replacement or the fluid is old and needs flushing.

So what are some tell tale signs of a master cylinder needing to be replaced?
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Old 08-28-2019, 02:10 PM   #2
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If the rotors are warped it could be pushing the pads back slightly so next time you brake it’s mushy.

I would reassess after you’ve replaced the rotors and fluid before looking at the master cylinder.
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Old 08-28-2019, 02:37 PM   #3
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If at all, a rebuild kit would be the way to go, rather than a whole new master cylinder. If it were me, I'd probably just get a rebuild kit and do it all at once. I've done rebuilds on a few of my own and a few for others, pretty easy job really.
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Old 09-01-2019, 11:14 AM   #4
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Quote:
Originally Posted by OOTV View Post
If at all, a rebuild kit would be the way to go, rather than a whole new master cylinder. If it were me, I'd probably just get a rebuild kit and do it all at once. I've done rebuilds on a few of my own and a few for others, pretty easy job really.
I had been researching these as well and was trying to decide on if I should do it or not. The bike has about 75k miles so I feel like a rebuild, minimum, is in order.

Is there a specific VFR rebuild kit you like OOTV?
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Old 09-01-2019, 07:36 PM   #5
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Quote:
Originally Posted by Big_Panda View Post
I had been researching these as well and was trying to decide on if I should do it or not. The bike has about 75k miles so I feel like a rebuild, minimum, is in order.

Is there a specific VFR rebuild kit you like OOTV?
I have used the Honda OEM kits for my rebuilds.
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Old 09-08-2019, 07:37 PM   #6
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You may like the Brembo RCS 19mm master cylinder


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Old 09-08-2019, 07:44 PM   #7
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You may like the Brembo RCS 19mm master cylinder
Why is that? What are the benefits over the OEM kit?
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Old 09-15-2019, 10:16 PM   #8
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Installed the new rotors and it fixed the pulsating brakes problem, which I was pretty sure was warped rotors. It also seems to have tightened up the brakes too. I think, like Tonybeau mentioned, it was pushing the pads/cylinders back and creating a mushy braking system. I havent taken it on a long ride but around my neighborhood i tried crushing the brakes and it all seemed much more responsive. Thanks for the advice guys!
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Old 10-04-2019, 01:17 PM   #9
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My 98 vfr had warped rotors which would spread the calipers open and give a mushy feel at the Master cyl. If you rebuild the MC you will want the genuine Honda parts if available. Aftermarket parts are a shoot. Maybe fits and last like OEM. Not likely as good as Honda.
Brembo MC will likely give you more control over your braking with much less grip effort. I have Brembo on both my 99 VFR and 16 Tuono. Excellent product but for a linked ABS system may not be totally necessary.
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