Constant bubbles coming from front master cylinder during brake bleed (2005 Yamaha R6)

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Hi Guys,

I've got a problem that's been plaguing me for a couple months. Every few weeks my front brake will get spongy and I'll have to bleed them if I want to ride. This fixes the problem temporarily, but it always comes back.

On an R6 there's 3 bleed valves, two in each of the front calipers, and one on the master cylinder. The fluid coming from the calipers looks great, no bubbles, but when I bleed the master cylinder, it's a constant stream of bubbles. Do I need to rebuild my master cylinder or am I doing something wrong bleeding them?

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manviret

2005 Yamaha R6 / 1981 Honda CM400E

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Posted: 2 years ago
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