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YBR125 Front Brake


Wigster
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Hi all,

My son has just got a YBR125 that was in need of some TLC, including the front brake binding a bit.

We've stripped it down, cleaned off the brake piston, and put new seals in. Brake fluid has (obviously) been changed as part of this, and the system fully bled. I did this with a compressor bleeding tool as used by garages, and when you pump the front brake, the pressure does not increase as you do this.

It all works now (piston pumps in and out beautifully), but to me, it still doesn't seem right. Now, perhaps I'm just too used to the brakes on bigger bikes, but on this one, you can pull the handle back to the bars fairly easily. Even at slow speeds (just pottering around outside the house), it also doesn't stop anything like as quickly as I'd expect.

My son says it's still better than his drum-braked CG125, but I'm not happy with it, so am trying to find out if we still have an issue somewhere, or if this is just as good as it gets.

I think I'm going to get an overhaul kit for the master cylinder ordered up anyway, but am not confident that this will improve things.

Anyone got any ideas please?

It's an '07 plate, and has done in the region of 6-8,000 miles.

Thanks

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Bleed it the old-fashioned way, I say. Pump up the pressure a few times, hold lever in, open bleed valve for a couple seconds, close, rinse and repeat. You should be able to get the lever stopping solid a good inch or more away from the grip.

I personally insist on braided brake lines for all my bikes. I believe they do help, as plasticky rubber lines start to bulge under pressure after a while. They also look better!

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Bleed it the old-fashioned way, I say. Pump up the pressure a few times, hold lever in, open bleed valve for a couple seconds, close, rinse and repeat. You should be able to get the lever stopping solid a good inch or more away from the grip.

Yeah, done that as well, after the airline tool, just to be sure. Makes no difference, and each pump does not get stronger.

I suspect a braided line might be on the cards, but to be honest, the only bike I ever changed them on was my old TRX850. Original rubber to braided stainless, and I didn't feel any difference at all :-(

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