Re: another new guy needing help
I'd suspect a hydraulic problem.
Check the fluid level in the master cylinder (which should be the opposite side of the bulkhead to the pedal, and will look like a smaller, simpler version of the brake cylinder). If it is low or empty, you have a leak. If it is still full, you most likely have a problem with the master cylinder, or an airlock in the system.
If there is a leak, the fault will be either in the pipe(s) or the slave cylinder. You might be able to see signs of fluid where it leaked - if not, refill & bleed it, and get an assistant to press the pedal as you check for leaks (be careful, as fluid could spurt out under pressure!)
It is unusual for an airlock to suddenly appear, and they usually manifest as limited resistance rather than none at all - you'd find that the pedal did nothing for much of its travel, then got harder once you had compressed the air enough.
Master cylinder issues can be harder to diagnose, as they can fail without leaking externally, and simply allow the fluid to freely pass between the reservoir and pressure sides of the cylinder.
|