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General Category => General Discussion => Topic started by: Tkelly on February 27, 2024, 08:55:11 PM

Title: Stopped when parked
Post by: Tkelly on February 27, 2024, 08:55:11 PM

Started my great running t3 today and went for a pleasant ride except the linked foot brakes are not working.Cylinder appears full,no sign of leakage.Never experienced this before ,any ideas for fix?

Title: Re: Stopped when parked
Post by: Turin on February 27, 2024, 09:09:07 PM

Might be a seal issue. You could try bleeding the master, and if that fails rebuild it. Kit's are available and It's not that tough as long as someone ham fisted hasn't already been in there. There are also replacements available. That's the direction I ended up going.

Title: Re: Stopped when parked
Post by: jhem68 on February 27, 2024, 09:35:01 PM

Make sure there is a little free play or gap between the master cylinder piston and the cam that pushes on it when the pedal is at rest. If the master cylinder piston is not free to return completely when the pressure on the pedal is released, it will not function properly.

The riders manual on Greg Benders site will show how to check and adjust if necessary. Next time come over and we will attempt a bleeding!

John

Title: Re: Stopped when parked
Post by: pehayes on February 27, 2024, 10:41:07 PM

Quote from: jhem68 on February 27, 2024, 09:35:01 PM

little free play or gap between the master cylinder piston and the cam that pushes on it when the pedal is at rest. If the master cylinder piston is not free to return completely when the pressure on the pedal is released, it will not function properly.

Worse than that.  The piston can get sticky and prevent springing back out.  You need to completely remove the linkage and ensure that the piston is free to move outward completely.  Grasp the piston gently with some needle nose pliers. Perhaps wrap the tips in tape to protect the soft piston surface.  You can use a 'Q-Tip' and some brake fluid to clean up the outer wall of the piston and lubricate it.  If it still fails, search for a rebuild kit and service instructions here.

Patrick Hayes
Fremont CA

Title: Re: Stopped when parked
Post by: Huzo on February 28, 2024, 04:09:13 AM

“Not working” is a fairly generic sort of description regarding your issue.
Is the pedal jamming ?
Pedal flopping down in the “on” position ?
Not returning back to “off” position ?
What is I’d doing correctly and incorrectly ?

Title: Re: Stopped when parked
Post by: Tkelly on February 28, 2024, 07:32:11 AM

I think the piston is probably stuck,will investigate and report back,thanks for the advice.