So! 98 Rodeo,2wd.

Replaced my sons Master cylinder after he complained of pedal to the floor.

Checked for leaks all around , non found.

Replaced Cylinder and bled breaks starting from the rear. Good to go.

After 1 week he complains of soft breaks again. Bled the breaks again.

This happened 2 more times, had it bled by 2 other people. We all have experience with this. we cant all be doing it wrong!

Finally, replaced the Master Cylinder again with the 2nd new one. Same thing happened after 1 week. WHAT THE HELL!!!!!!!!!!!!!

Took it to the shop. They did a Break fluid Flush since they do that under vacuum. Ok! good to go. They also checked for leaks all around. NON FOUND!
Also called Dealer and asked about cycling the ABS. They said NO that car does not call for that. Could they be wrong?


Now after a week it happened again. PLEASE HELP!!!!!! Thank You!

 

Not too familiar with these yet but I would guess pads or possibly the seals inside brake calipers, the seals could be letting air into the lines. Or the booster maybe, again just picked up my first "rodeo" couple weeks ago so I'm definitely no genius.