Is there a common cause for no rear brakes and brake light on?

[R/T Boy 67]

You might need a new unit, that iron one is probably a corroded mess inside.

 

[WileE]

Not necessarily. You'd be surprised how that can be cleaned up. The most difficult part of that job is unloosening the brake lines.

 

[Myasylum]

Since we are on the Brake subject... Anyplace good to get Rotors? Might as well knock it all out at once. I went to Rock Auto and they seem to be sold out. Fairly expensive too for a stock type rotor.

 

[R/T Boy 67]

The 73 and up rotors are the cheap common ones. Dr Diff sells a kit to fit those rotors to your spindles.

 

[Myasylum]

Geez, just browsing around it looks like in 72 you need a bearing kit too?? oh boy?!

 

[WileE]

Geez, just browsing around it looks like in 72 you need a bearing kit too?? oh boy?!

Call Craig at Mobile Parts 516-485-1935. Tell him WileERobby sent ya.

 

[theman440]

Sometimes you can reset them by pressing on the brake pedal really, really hard with both feet. Give it a try - you'll here a "pop" noise when it resets.

 

[Sixpactogo]

I had an issue with a distribution block where I was bleeding the brakes with a vacuum pump. The vacuum pulled the shuttle towards the rear, blocking fuid flow to the rear brakes. I removed the brake warning switch and was able to push the shuttle back to center with a small 90 degree prick. Not sure it would work with a Proportioning valve since the shuttle is longer. May be worth a try though.

 

[Myasylum]

So I did bought a new master cylinder as well, and the brake pedal is firm after bleeding but it seems I no longer have power brakes?! Any ideas? Vacuum hose is still connected.