brakes.. again

[JApplegate]

i either don't ahve any luck with brakes or it's just my truck. i replaced the master cylender last march and now the brakes are fadding and when i press the brakes down hard the brake warning lights come on both of them. i'm kind of worried because i'm driving really fast to fire calls and i would like to have dependable brakes under me. i went back to the dodge dealer and they reorded me another rebuilt master cylender. no cost to me because it's still under warranty. is there any other problems that i should check? i have never gotten these brakes right. are those warning lights warning me about something else?? AIR BRAKES. i'm half tempted

 

[JLEONARD]

Just say NO to rebuilt master cylinders. Period!

There is tons of stories about that here in the first gen section.

Don't ask me why, just because.

I went new with mine right off the bat... not because of this forum but because I'd been burned in the past.

Trade in that rebuilt on a new one and your troubles will fade... . not the brakes!!!

Jay

 

[Greenleaf]

It can be caused by many related items. Too many to list here. A start would be;



MC

anti-lock valve

vacuum assist

vacuum pump



I belive that if both lamps are illuminated, you have lost vacuum? If just the anti-lock lamp is on you have an anti-lock problemo. If just the brake lamp is on you have a pressure loss or the park brake circuit is closed (park brake is set or wire shorted).



Sometimes, if you don't use the brakes, and would loose vacuum, just the brake lamp will illuminate. Then, if you use the brakes, the anti-lock lamp will come on.



Clear as mud. You need to read the manual. There are one hundred senarios.