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Old 02-22-2020, 11:07 AM   #1
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Front Wheel Locked

Cranked the bus this morning. Let air pressure get up. Put into gear. Front right wheel is locked. Any ideas?
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Old 02-22-2020, 11:21 AM   #2
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Check the adjustment on that brake (and the others). Could be that the S cam flipped over, but I don't recall if that causes them to lock up or not work. Could also be a failed air can. The air brakes are designed to stay locked on when they fail.
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Old 02-22-2020, 05:25 PM   #3
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Originally Posted by ermracing View Post
Check the adjustment on that brake (and the others). Could be that the S cam flipped over, but I don't recall if that causes them to lock up or not work. Could also be a failed air can. The air brakes are designed to stay locked on when they fail.
yes the cam could cause it but the front brakes do not lock up in park like the rear. shoes sometimes get debris in them or wheel bearings are bad
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Old 02-22-2020, 05:28 PM   #4
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Originally Posted by ermracing View Post
Check the adjustment on that brake (and the others). Could be that the S cam flipped over, but I don't recall if that causes them to lock up or not work. Could also be a failed air can. The air brakes are designed to stay locked on when they fail.

My first question is air or hydraulic brakes. Hydraulic brakes can lock up, typically from an internally collapsed rubber hose, or a seized caliper.


When air brakes "Cam-Over" it does not lock. In fact, there's no braking action at all! (This is why it's a really Bad Thing.) There are *NEVER* parking brakes on a steering axle, the logic being you still need to be able to steer and control the vehicle even if a "can" fails while you're driving (it can happen).
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Old 02-22-2020, 08:11 PM   #5
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i beat a slack adjuster a few times as the s cam was on the tip and did lock the brakes up so it has happened
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