Also, would anyone know for sure if this part number 18M390734 ACDelco master cylinder would fit on my 2003 Base AWD Vibe with ABS ?
It says on some websites it does, but just wanna make sure.

Thanks

Ok, so this is an ABS Vibe.

Check valve seems fine, blew into it and air didn't go anywhere.

Pedal is solid when vehicle is off and then drops quite a bit when holding foot on brake and then starting vehicle.

Thanks

No dragging brakes.
No dash lights.
No codes.
And yes, the fluid has been changed.

The pedal isn't great at the best of times. Sitting in park it isn't very solid, will lower and lower.

Could the Check Valve cause such a serious issue cuz it looks original ?

Thanks again.

Ok, so my 2003 Vibe AWD did it again !! So I've now had it two years, I've lost the pedal 3 times with three different master cylinders on the vehicle (one that was on it when I bought it and two remanufactured units). Not consistent loss of pedal, it'll go for months or more and then Once will go t...

Hello, New to this site. Have a 2003 Vibe all wheel drive that I've owned for about 15 months. About a year ago after just got the car on the road the brake pedal suddenly went to the floor. Diagnosis was master cylinder. Replaced Master cylinder with new one, bled system and was fine for about a ye...