[quote="PhilC"]Hello All
Would anyone have a service manual that shows a circuit drawing for the late model 944 brake air system? My manual has brake info that was issued in 1960 and 1963 and shows the later style air over hydraulic system but not the split system used in the final version of the 944 effective with serial 43A5043.
Also need any info about how the chamber and cylinder assembly were mounted. Photos would be very helpful.
Thanks in advance
Phil[/quote]
Here are some scans from a last of series 88J 922B parts book. The brake system layout would be identical to a later 944.
[attachment=58233]001 (Custom).jpg[/attachment]![]()
Another couple of pages; couldn't get them to attach to the original post for some reason.![]()
Link to catalog page of a typical quick exhaust valve
https://www.asco.com/ASCO%20Asset%20Library/asco-quick-exhaust-catalog.pdf
cc, my old LW923 Kenworth didn't have quick release valves on the park brake supply and it took a noticeable time to both apply and release. Once I plumbed a valve right by the axles, it was almost instantaneous. That was a revelation to me as I didn't know much about air brake systems. They're a great part of the system.
Looks like there is a change from the 88b to the 94a going from separate front and rear braking systems to separate left and right.
My 59a 922b has the single chamber air actuated brakes. Originally it had 4 wheel brakes on the single chamber master cylinder, but I’m down to front brakes only and glad to have them! It had not had brakes in a very long time before I got it, but I’ve gone through all 4 wheels stopping oil leaks and finally got things dried up enough that the brake shoes have a chance to stay dry. I cleaned the brakes thoroughly before reassembly and am hoping they’ll get better as time goes by and I get the chance to readjust the clearance a time or two. Rear brake hardware was torn up enough that I just took it all out and stored the remaining parts for “someday”.
I’m almost certain my brake “treadle” valves do not operate the same as the later versions shown in that schematic. They seem to be a simple valve that opens between bottom gang of 4 ports and top gang of 4 ports. Mine have supply in at bottom and deliver air out at the top when the pedal is depressed.