Trouble With Front Master Clynder

[Dennis49]

I have a 1981 GS1000G and I rebuilt the front master clynder. When it is exstremly hot outside the front master clynider will build up pressure on the caliper and lock the front wheel just as if the brake handle was pulled. the handle is tight and you have to bleed the calipers off to release the pressure and this happens while the bike is sitting still and not been running. Please help!

[Nessism]

Sounds like the relief port in the master is plugged. The hole is very small so you need to use a piece of wire or similar to clean it out.

As a side note, and I don't know if this applies to you, but many people continue to run the original rubber brake lines on their bikes after 30 years. Suzuki calls for changing these every two years, which is excessive, but still....they should be changed before 30 years to be sure. The old lines build up with contamination scale on the inside and pollute any fresh brake fluid someone might fill the system with. Not good.