4104 unable to move

[mung]

High and low like the ones on my ex-greyhound?  I guess there is an exception to every rule. 

[luvrbus]

I help the GM guys with the ICC brakes we just remove the old bar weld brackets for a spring brake, reline the old drive line brake install a Bendix toggle switch on the dash and be done with it then when you lose air pressure the brake applies on it's own plenty of room to install a spring brake canister on a 4104 and the pre DD3 4106 systems

[eagle19952]

I help the GM guys with the ICC brakes we just remove the old bar weld brackets for a spring brake, reline the old drive line brake install a Bendix toggle switch on the dash and be done with it then when you lose air pressure the brake applies on it's own plenty of room to install a spring brake canister on a 4104 and the pre DD3 4106 systems

good idea....i don't do so well in the 40 foot dash any more 

[mung]

Why did they stop using the hand brake on the 4104s? 

[luvrbus]

They never did it carried over into the 4106's

[mung]

So I guess someone took his hand brake out?

[eagle19952]

So I guess someone took his hand brake out?

perhaps the maxi mod is already in place...and the extra button is not yet deciphered...??

[luvrbus]

The maxi will hold without air but you apply pedal pressure before setting the other knob is for the front brakes 

[pennuja]

So do I need to either hold the pedal down and apply the button, or try the many many buttons that I still do not know what they do.

Where would the maxi mod wire connect to maybe I can back trace it to a button.

[luvrbus]

Maxi brakes don't use electricity I doubt you have the maxi brakes they were just a miniature version of the spring brake a photo of the front and rear air chambers it's easy to tell what you have

[chessie4905]

   We installed spring brakes on our 4104. Easy to do and clear the body unlike the 4106 and later models. We also removed the brake drum and hardware off the driveshaft, which was a pita any time you wanted to service the driveshaft, u-joints, diff. transmission or clutch. That other button may have been used to hold coach on a hill while waiting for a stoplight.

[mung]

On the note of holding the brakes for a long time at a light or something, is the correct procedure to engage the hand break so you don't eat up all of your air?

[luvrbus]

No the only pressure drop should be at first application then it should start building up again if the pressure keep dropping you have major leaks

[eagle19952]

No the only pressure drop should be at first application then it should start building up again if the pressure keep dropping you have major leaks

double 
fix the leaks and measure the recovery time....or forget seattle and san francisco...or better yet, follow me...

[mung]

I haven't really tested it yet, I will do that today.  Just like other things, I need to learn how not to drive again.  I tend to pump breaks on cars and that won't work on the bus.