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YOUR RESEARCHWhat kind of brake problem is this?
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just as simple
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Replace '99 brake vacuum booster and the cordian due
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Suggestion
There's a TSB to replace the '99 brake vacuum booster and the cordian due to water intrusion into the vacuum booster.
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99 996, C2, 89k: When braking very lightly, when I release the pedal, the brake still holds slightly. Tapping the pedal lightly again, the brakes release and the car coasts normally. Booster? Master cylinder? I have an indie appt next Monday and will check all out but thought I would raise the ? here.
Thanks,
Bob
Sticky piston, or maybe something with your ABS pump acting up. Does the pedal come up as expected, or does it stay down? Maybe something simple like a bushing...
I had a similar issue on my 99. Fearing the worst, it ended up being a bushing on the brake pedal itself. My dealer had never seen that issue before. Hopefully your issue is just as simple.
I believe the pedal returns to its "up" position. But occasionally the brakes do not completely release, only after the most gentle depression of the brake pedal.
Is it only one brake sticking or all of them? If only one, sticking caliper piston. If all, have to go with either a sticking bushing on the pedal lever or a master cylinder piston/internal return spring is gummed up. I know it is a pain to lay on the floorboard and look at the pedal movement but that is where I would start. Make sure the pedal is not sticking or not rotating correctly on the bushing. A shot of silicone spray on the upper part of the pedal on the bushing may eliminate at least a sticky bushing.
There's a TSB to replace the '99 brake vacuum booster and the cordian due to water intrusion into the vacuum booster. Water enters the booster due to clogged drain holes in the battery compartment. The symptom is the brake pedal not coming back up even with your foot is off the pedal. Maybe you're at the early stage of that....just one of the possibilities.
this is precisely my symptom. I checked very carefully, and sure enough, the brake pedal does not always return to its full released position. when I press hard on the pedal it does return all the way but if I press gently on the pedal it does not. there's about a half an inch of travel that it does not return to automatically. In the garage I can see that the brake lights are on when my foot is off the pedal when I depressive very gently with my fingers or my foot.
You can at least check if the drain holes in the battery compartment are clogged. See posts #15 and #20 here
https://rennlist.com/forums/996-foru...age-holes.html
Of course the bushing is also a (easier) possibility as others have pointed out so you should probably eliminate that first.
I had that symptom, but it fixed itself. I chalked it up to not driving enough.
edit: Luckily, I didn't wear out the brakes, because I could nudge the pedal back with my foot, and I knew I was coasting freely after pulling it back. Then, while waiting for parts to arrive, it started getting better, and now perfect.
