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Brake pedal tend to stick/not return when pressed

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  • Brake pedal tend to stick/not return when pressed

    Hello, i notieced some time ago, especialy when drive a cold car (S2 coupe aby).
    Brakes working without problem, but when i step on brake pedal and then release it, it tent do stuck on stepped position for a miliseconds delay. I listen(and feel on foot) usntuck clunk when pedal released itself.
    Is bit anoying. Its going away after several brake pedal usages.


    Past owner used red atf fluid in PAS, i tooks me 3L of green one, to have clean fluid in the system(without red and grey metal gunk). On first two litres(synthetic) i occasionaly get red warning on dash, but now(knock knock) nothing on last litre(used mineral one this time).
    All brake system is oem, just bigger front discs.

    Thanks for any inputs from your experience.

  • #2
    Last week i installed new heater matrix, so whole dash was out. I also repaired cracked a looste brake pedal sleeve. So i of course stepped many times on pedal without engine running. Fluid in servo reservoir go up by few centimeters, which is as expected.
    But after all assembly and engine running again, fluid is still over maximum and have "pumpy" pedal with pressure red warning.
    Tried to suck all reservoir, stepped XX times on pedal, no fluid comes back to reservoir. So i feed all fluid back, at started engine. Im still over maximum with warining.

    Pedal is hard when i jump on it, but after half a second it get loose(almost as normal, just feel pumping in pedal). So its drivable carefully, but when i it comes to emergency braking...

    Checked filter in bolt at servopump, its clean. Bolt at the bomb i was unable to get loose.

    Its a bomb fault? It can be just jammed one way valve inside?

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