GL1500 Rear Brake Mystery, help!

Being a sealed system, There has to be a leak somewhere. Possibly a small crack in the bottom of the reservoir, or at the left front brake which is tied to the rear break.

sidvicious said:

new cuss words?

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"Linfrantzenmeck", and "Stridelnagenhof".
+1 on front brake, if it's a linked system.

There can be a crack in a steel line not necessairely close to the wheel trace the line and clean with brake kleaner, the apply brakes to presurise sytem, look for small leak sometime it could take a bit of time but if the line has dirt and black gracy stuff its a good sign of oil accumulation absorbed by the dirt. its a sealed system oil has left the bike somway or an other.

Does the 99 SE have a linked system? I thought all the brake lines were rubber lines.

Just asking cause I havent had this bike but 6 months.

sidvicious said:

Does the 99 SE have a linked system? I thought all the brake lines were rubber lines.

Just asking cause I havent had this bike but 6 months.

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The bike HAS linked brakes. The handlebar brake lever operates ONLY the front RIGHT disk brake. The foot brake pedal operates the front LEFT disk brake & the rear disk brake. There are a mixture of rigid steel brake pipes & rubber flexible pipes in the braking system, you will find that out when you do the routine maintenance after taking the tupperware off.