how to check brake fluid in a Suzuki GSXR-600 motorcycle?
make sure both your reservoirs are filled to the max fill line. if they are and you fee like you have good braking power then your fluid and brakes are fine.
The front brake reservoir is on the front brake lever, if it is clear plastic you will see the fluid level, it should be at least half way up but don't fill it to the top. Any spills need to be washed off by soapy water straight away as it dissolves paint. The rear brake, if a disc system, you will find the reservoir near the rear brake lever and the same applies as the front brake.