Brake lever sticking - BMW Luxury Touring Community
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post #1 of 4 Old Jan 18th, 2010, 12:32 pm Thread Starter
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Brake lever sticking

Recently completed a clutch replacement on my 99 LT, one of the steps was bleeding the front brakes. Well now the front brake lever sticks 1/2 way & I must push it forward to allow the brake lights to go off & cruise to work. With out inspection a mechanic said I needed a master cylinder, can just the bleeding process have damaged the MC? If I do need to replace the master cylinder is it just a rebuild kit or do I actually have to replace?
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post #2 of 4 Old Jan 18th, 2010, 5:07 pm
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Re: Brake lever sticking

If there had not been a fluid flush performed on a regular basis, rust can form in the area of the MC that never gets used (brake lever does not bottom out like the clutch). In flushing, pulling the seals through that rusty area can damage them. There is a service kit that may work if the bore is not too bad ($70.00) otherwise it is a whole new unit for about $430.00.

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post #3 of 4 Old Jan 19th, 2010, 9:44 am Thread Starter
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Re: Brake lever sticking

Thanks, is there any safety concern with my situation?
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post #4 of 4 Old Jan 19th, 2010, 9:53 am
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Re: Brake lever sticking

Originally Posted by jameshawk
Thanks, is there any safety concern with my situation?
Yes, if the master cylinder piston seal is indeed damaged, then you could lose your brakes. Most likely you will first notice the lever continues to sink after the brakes are fully applied, but it could also completely fail without further warning, leaving you without front brakes.

This is one reason I do not prefer the old "pump and bleed" method of flushing brakes. Even using Speedbleeders can cause this type of failure. True that normal maintenance will help prevent the corrosion and dirt from developing in the bore, but it may be inevitable on older bikes (especially for those of us that buy pre-owned). This is why I am building an adapter for my Motive Power Bleeder to use on my LT.

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