Ok guys, I have noticed during these extremely cold (for my area) temps that i think my brake booster is failing.
When i push on the brakes if I push a little over half way, i hear/kinda feel a "thump" then my idle fluctuates. during this time, if i hold it, i hear what i believe is a vac leak.
If I hook up my torque pro app, the short term fuel trims support my vac leak theory by ******* out at 50%.
If I move my foot (letting off) about an inch it stops, idle returns to normal and STFT return to normal.
The odd thing is if it's relatively warm (0°+) it won't do it.
So I guess my question is, can brake boosters partially fail?
When i push on the brakes if I push a little over half way, i hear/kinda feel a "thump" then my idle fluctuates. during this time, if i hold it, i hear what i believe is a vac leak.
If I hook up my torque pro app, the short term fuel trims support my vac leak theory by ******* out at 50%.
If I move my foot (letting off) about an inch it stops, idle returns to normal and STFT return to normal.
The odd thing is if it's relatively warm (0°+) it won't do it.
So I guess my question is, can brake boosters partially fail?