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Old 01-08-2016, 11:22 PM   #1
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Location: Gonvick MN
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Year: 1975
Chassis: Gillig
Engine: Cat 3208t/10 speed transmission
What's this??

I just bought another bus for parts, or something.
It needs a bit of cleaning.




But this has me stumped.
What's the blue knob do?
It says "parking brake release, push and hold".
When you push it in it leaks a little air around the valve but doesn't seem to have any effect on the brakes.
The yellow knob releases the brakes.
This bus is almost as old as me (really old).
Anyone older or wiser or both have an answer?
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Old 01-09-2016, 02:37 AM   #2
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Year: 1946
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Chassis: 1- 1/2 ton
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Could be the park brake. Does not look like a factory panel so who knows.
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Old 01-09-2016, 07:31 AM   #3
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Year: 2003
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Engine: T444E/AT545
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Looks like a spring brake release.
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Old 01-09-2016, 09:09 AM   #4
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The old iron I used to drive in the 60's had this release. It was good for a couple of times if you had to move the vehicle off the road for example. Had a small air reserve plumbed to it.
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Old 01-09-2016, 02:27 PM   #5
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Join Date: Jan 2015
Location: Gonvick MN
Posts: 255
Year: 1975
Chassis: Gillig
Engine: Cat 3208t/10 speed transmission
Quote:
Originally Posted by 2kool4skool View Post
The old iron I used to drive in the 60's had this release. It was good for a couple of times if you had to move the vehicle off the road for example. Had a small air reserve plumbed to it.
It's a 1970 model so that is most likely it.
Thanks.
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Old 01-10-2016, 12:23 AM   #6
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Prior to the change in how brakes were plumbed in the mid-70's air brake equipped vehicles had a reserve tank that allowed you to move a bus after you had lost air in the service brakes and the spring brake applied.

If you notice, just in front of the spring brake control there is a brake limiter. It reduces the amount of air pressure that goes to the front axle. Supposedly the use of the limiter will reduce the possibility of the front axle locking up before the rear axle.

With the advent of the dual circuit the limiter was no longer necessary.

By the way, it would appear as if you have found another Gillig. That pattern of stainless steel panel is a very distinctive Gillig feature that was used in the classic schoolcoach in any bus that was ordered with the higher cost stainless interior panels.

By the way, that is an updated control valve. The original would have had a black and red button but the newer ones got yellow and green to match the yellow single valve all of the newer vehicles got.
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Old 01-10-2016, 01:59 PM   #7
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Join Date: Jan 2015
Location: Gonvick MN
Posts: 255
Year: 1975
Chassis: Gillig
Engine: Cat 3208t/10 speed transmission
Thanks for the info Mr Cowlitz. I was hoping to hear from you.
Yes another Gillig, but when you find a good deal what can you do but buy it?
Now we have to decide whether to drive it home, leave it here or sell it.
"What I did on my winter vacation"
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