Park brake disengaging

[Roddy262B]

Hello. I have had my machine for several years and recently when it was parked on a hill in the driveway the park brake disengage and it started rolling downhill. What can cause this?

 

[Roddy262B]

I don't know if more information would help but there was a clunk and then the machine started rolling and I could hear the drive mechanism winding. A second time it just started movong really slowly. If I shut the machine off without lifting the bar or actually pressing the park brake button does the park brake not actually engage?

 

[Tazza]

I don't know if more information would help but there was a clunk and then the machine started rolling and I could hear the drive mechanism winding. A second time it just started movong really slowly. If I shut the machine off without lifting the bar or actually pressing the park brake button does the park brake not actually engage?

It's possible your brake disc is worn, allowing it to jump teeth. I don't know the brake setup on these machines, but i'm assuming it's a wheel with notches in it as you describe clicking noise.
With a good drive system, internal leakage will aloow the motors to move when under load, so that is totally normal.

 

[Roddy262B]

It's possible your brake disc is worn, allowing it to jump teeth. I don't know the brake setup on these machines, but i'm assuming it's a wheel with notches in it as you describe clicking noise.
With a good drive system, internal leakage will aloow the motors to move when under load, so that is totally normal.

Thanks for the reply. Upon investigating further I don't know that the brake is disengaging but rather not being engaged when the machine is shutnoff. On a gentle hill I shut the machine down and it slowly and silently rolled a few inches. I started it back up and this time pushed the park brake button before shutting it down and it did not roll. The brake is on when you start it so I assumed (that's probably my biggest problem) that it was engaged when it was shut off. It has never rolled before though. Maybe it just needs less inertia to get moving as it gets older?

 

[Tazza]

Thanks for the reply. Upon investigating further I don't know that the brake is disengaging but rather not being engaged when the machine is shutnoff. On a gentle hill I shut the machine down and it slowly and silently rolled a few inches. I started it back up and this time pushed the park brake button before shutting it down and it did not roll. The brake is on when you start it so I assumed (that's probably my biggest problem) that it was engaged when it was shut off. It has never rolled before though. Maybe it just needs less inertia to get moving as it gets older?

That seems very weird, they would syrely default to when key is off, the brake comes on. I wonder why it didn't engage the time you were on a hill.
I guess it's a good idea to turn the brake on before shutting down and you can listen for the click and know it's not going to roll.
Wear over time could allow it to not lock when it has started to slowly move, but i'd like to doubt it if it works just fine when brake is engaged before shutting down.,