Simple Madass : The rear brake locking issue..

The day that i hope never come, did come. Even with a brembo in my rear brake, it happened (so it is not caliper issue). The rear brake just locked up with no reason. I pushed the brake pedal and the piston stay at full pushed position. Lucky that it jammed before i ride it.

After i disassembled the stock master brake assy, and compare it with aftermarket brake assy, i didn't have clue why it will jam on full stroke. Everything looks normal, seal were intact, spring were strong. Then i interchanged the piston and seals assy between them and confirmed that the stock piston/seal assy still jammed in the aftermarket brake assy.

Build quality wise, i don't know why the stock one have thread on the piston, but it looks so crude built, not smooth metal surface. Anyway, the aftermarket piston and seal work perfectly in stock master brake assy, so why not just use it.

Now it works as it should be, as a lesson learn, if you have a madass, just replace the rear piston/seal assy on your rear master brake, and hopefully you can avoid the lock up issue.