| Author | Message | ||
| Wayne Buttress (Eagleman)
Registered Member Username: Eagleman Post Number: 19 Registered: 7-2004 Posted From: 75.106.244.26 Rating: N/A |
Hi Guys, Treadle valve is nonfunctional. I need to move the bus. Would appreciate info. on pinning the brake cans. I have the the pins, but don't know the procedure. Thanks for any help, Wayne | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 554 Registered: 8-2006 Posted From: 207.231.75.253 Rating: N/A |
Wayne, We need more info, your bird, or your 4104? If it is the bird, does it have spring/maxi parking brakes, or DD3s? Easy to tell which, look at the cans, and count the hoses. 2=springs, 3=DD3s. "Pins" loses me, springs can be caged with a large socket wrench from the back of the can, DD3s are more involved. How are you going to stop the bus once you move it with no foot valve and disconnected emergency brakes? Talk to us, and we'll go further. George | ||
| Mel La Plante (Mel_4104)
Registered Member Username: Mel_4104 Post Number: 67 Registered: 7-2006 Posted From: 154.5.115.97 Rating: N/A |
first if you can air the bus up to 110# of air then release the spring brake valve to release them now put the bus in reverse and try to brake the shoes loose from the drums you may want to try going from first to revers a couple times. if this does not release them then air up the air bags to their top. them BLOCK the bus so it cannot come down on you then slid under the back of the rear axel where the brake pots, in the center of the pot there is a plastic or rubber plug,take it out now on the side of the air pot there should be a thing that looks like a peice of ready rod with a small pin at one end and a nut on the other, take the end with the pin and insert into the hole you took the plug out of push it in straight at the shaft coming out of the other end of the pot, when it hits in as far as it will go turn it clock wise as far as it will go [1/4] turn now tighten the nut up to the back of the brake pot as tight as you can get it . you will feel the diaphragm being pulled back , this is what is called caging the brakes. this may not release the brakes as they some times freeze to the pads to the drum. now you can try the rocking back and forth trick again, good luck... | ||
| larry currier (Larryc)
Registered Member Username: Larryc Post Number: 196 Registered: 2-2007 Posted From: 207.200.116.13 Rating: N/A |
Treadle Valves seize the pins and you just spray them and free the pedal. If your valve is really bad, they are not expensive and you can use a common model on that old of a rig and have an update. | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1355 Registered: 12-2000 Posted From: 76.68.122.134  Rating: N/A |
What happened here? happy coaching! buswarrior | ||
| George M. Todd (George_mc6)
Registered Member Username: George_mc6 Post Number: 560 Registered: 8-2006 Posted From: 207.231.75.253 Rating: N/A |
BW, Thanks for asking! Have had an off board email, have made suggestions, and have just asked for more info. G | ||
| Wayne Buttress (Eagleman)
Registered Member Username: Eagleman Post Number: 20 Registered: 7-2004 Posted From: 75.106.244.26 Rating: N/A |
Hi Guys, I'm still not sure off the procedure for caging the the brake cans (pots). I have been under the bus. There appears to be a bolt/nut combo with a small "T" at the end where bolt head would be, coming out the back of the can. Please explain one more time. Old brain. Thanks, Wayne | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 1358 Registered: 12-2000 Posted From: 76.69.142.162 Rating: |
Hello Wayne. If the treadle valve is defective, how are you going to stop this bus once you get it rolling? The caging bolt, the proper term for the "T" bolt, often has a mounting tube on the side of the chamber to store it, remove it from there. Clean up and lube the threads, it'll make the job to come a little easier. The "T" part gets inserted into the back of the brake chamber, the end opposite from the end where the pushrod comes out. There should be a plug of some sort protecting the hole from dirt, pry it out. Deep in there, and in line with the centre of the assembly, will be a slot that the "T" will fit through, then a quarter turn will engage it. You might have to fish around a little to get it to engage. When you tighten the nut that you thread onto the end of the caging bolt, it will pull the big parking spring tight into the back of the chamber. As you tighten the nut, the pushrod should retract at the same rate as you are threading the bolt out. The caging bolt is just doing mechanically what the air pressure does pneumatically when we push the parking control valve up at the driver's seat. Safety first! At the first sign of anything stretching, cracking or breaking, get out of there and call the professionals. These parts should NOT show any strain during this procedure. The large parking spring is a killer, at all times, regardless of position, as it is already under great tension by being crammed into the brake chamber. If the brake chamber has deteriorated to the point of being weakened that thing is a bomb waiting to go off. happy coaching! buswarrior |
