I have this intermittant noise that seems to come from under the dash near or in the brake pedal/master cylinder. When I depress the pedal it makes a chattering/squeaking noise.

I looked under the dash to see where the noise is coming from and possibly grease some linkage. The noise sounds like it's coming from inside a rubber boot the is connected to the firewall (master cylinder?).

Is this something I should be worried about? Should I replace this? Can I get in the rubber boot and spray some white grease?

Any help is greatly appreciated.

2000 Rodeo LSE