92DripCherokee
NAXJA Forum User
- Location
- Tampa, Florida
My 2000 classic brake pedal sinks. It still does same exact thing AFTER a new MC, hoses, calipers, pads, and 3 brake bleed/flush cycles.
At one push the pedal is high and firm, and gets lower and spongier with each push. Every once in awhile it drops slightly, and fairly suddenly, while sitting at a stop. Give it a second to rest, and the pedal feel returns.
This isn't like brake fade, it even happens simply when pumping the brake at a stop, and while driving at all speeds. Unlike a loss of vacuum assist, IT GETS SOFTER!
The booster passes airtight tests, and while the engine is pulling vacuum, the pedal gets softer with rapid pedal pumps. The booster has vacuum reserve left after sitting overnight.
There are no fluid leaks, or fluid loss, the wheel cylinders are ok. No leakeage at the calipers, or the hard brake lines. The brake hoses are spanking new.
Is this "sinking feeling" a sign of impending doom? The stupid brake techs who drive it briefly never remark on it! My best guess (without the DRB III tool) is an internal ABS leak. Anyone have an idea? No ABS light has ever lit up either.
At one push the pedal is high and firm, and gets lower and spongier with each push. Every once in awhile it drops slightly, and fairly suddenly, while sitting at a stop. Give it a second to rest, and the pedal feel returns.
This isn't like brake fade, it even happens simply when pumping the brake at a stop, and while driving at all speeds. Unlike a loss of vacuum assist, IT GETS SOFTER!
The booster passes airtight tests, and while the engine is pulling vacuum, the pedal gets softer with rapid pedal pumps. The booster has vacuum reserve left after sitting overnight.
There are no fluid leaks, or fluid loss, the wheel cylinders are ok. No leakeage at the calipers, or the hard brake lines. The brake hoses are spanking new.
Is this "sinking feeling" a sign of impending doom? The stupid brake techs who drive it briefly never remark on it! My best guess (without the DRB III tool) is an internal ABS leak. Anyone have an idea? No ABS light has ever lit up either.
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