Car hasn't moved in a month, though I've attempted to bleed the brakes twice in the past week.
No leaks at the hardlines, but the driver's front continually pushes air. The piston looks wet but it doesn't feel wet, which is really bizarre.
Car hasn't moved in a month, though I've attempted to bleed the brakes twice in the past week.
No leaks at the hardlines, but the driver's front continually pushes air. The piston looks wet but it doesn't feel wet, which is really bizarre.
Kinda looks like it might be. Difficult to diagnose a leak like that but fairly easy to replace or rebuild the caliper and know for certain.
If it's only the drivers front, and not the passenger front or passenger rear (whichever one is paired at the master) then it's probably a caliper.
I have had a wheel cylinder that would leak air in but not leak fluid out. The car would get a soft pedal after a little while and then you could bleed air from it. If you clamped the hose off, the pedal never got soft, proving that it wasn't a master cylinder issue.
To be extra cautious, check the brake rotor for runout. Allegedly this was a huge problem on iron 4 piston Corvettes, rotor runout would walk the pistons back and forth and pump air in. That's a special case because fixed caliper, and those calipers had the seals on the pistons not the caliper body, but it can't hurt to check.
Corvette calipers were weird but they were also engineered in the early 60s before we had disk brake science figured out.
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