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05 525exc brake problem

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just pulled the bike out of shed after 11/2 years and grabbed the front brake and had nothing pumped the lever and still nothing tried the back and the same thing nothing need help do I just drain all the fluid and refill and bleed them or Is there a bigger problem?

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Seals might be gone in tge master cylinder but it could be just air.Pump the brakes a short while and hold them in as you crack the bleeder.if you hear air escape as u open the bleeder then your building pressure.some times it can take a lil while to get pressure built up.

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try tying the lever back to the handlebar over nite. Turn the bars so the MC is the high point and make sure the brake line has no loops sticking up..the MC must be the high point. Tap on the line a little and get the air moving up. If that doesnt work then do the back bleed. Loosen the main line at the MC when first starting the bleed to get the fluid thru system quicker. Then tighten and continue. When bleeding this way be aure the lever is all the way out and not tied back. Put a 5 gal bucket on the bar, hanging from its wire handle to catch the fluid.

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Kneel down beside the brake caliper. Grab the wheel at the 9 and 3 position, then use your knee to compress the caliper against the disc. This does a quick back bleed. Then pump the lever to get pressure back. Repeat if needed. Chances are this will cure your issue. It is very common and not a real problem. After sitting that much time, it may be do for a bleed anyway. But try this first. Should take about two minutes.

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I do the knee thing when on the trail and the brake goes away, like if the bike is upside down for a couple of minutes for instance on a crash

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The piston in the master cylinder is much to small tp move any air using the "squeeze, squeeze, squeeze, hold, open bleeder" method. The only way to get the air out is by reverse bleeding. Even then you should be compressing the caliper via the knee method to make sure the tiny air bubbles around the caliper pistons have been released. Then do another reverse bleed.

 

If the brakes get air again, a seal rebuild will be needed.

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thanks did the squeeze and the front and the rear brakes came back guess the master rebuild kits will stay in the spare part bin.

again thanks a lot guys

Edited by po5000

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