[locarno]

Hello,

For some time after few hours of parking , I feel a hard brake pedal. So far, after 1 day of standing, the pedal was soft and I could press it several times before it hardened.

After turning off the car, the pedal is soft for 3-4 presses. With the engine running, pressing the brake pedal quickly increases the revs slightly. I checked the pipe coming from the servo and it is not broken. I don't hear any hissing either. I can blow into the hose but I can't suck in air. The question is what I should check more and how to find where this pressure goes after few hours? Or leave it as it is?

 

[ttg4l]

Pressing the pedal quickly causing an increase in revs is normal, mine does it too.

Do you mean the pedal is hard for the first press after a few hours? The first situation you describe where it is soft for 3-4 presses after parking, before going hard, is normal - assuming the engine is off.

Blowing in one way and not sucking air is normal, it's got a check valve to stop loss in pressure.

 

[locarno]

Right after I turn off engine pedal is soft for 2-4 pressed. That's ok.

My problem is that pedal is hard after few hours. Earlier I had soft pedal even after 24 hours of parking.

 

[ttg4l]

If the pipe is intact and not leaking, then it'd be the servo diaphragm leaking, or a the servo has rusted and caused a leak. Double check the pipe and the seal around the servo connection.