Where is everyone #5

If the whole world had the clap, would it be a applause?

 

LOL

 

Correct

Or the S-cam ain’t seen grease in a long time and is sticking

 

I'll double check it in the morning, it does move when applying the brakes but adjusting the adjuster the rod moves instead of the cam. The rod moving isnt a sign of anything wrong with the can?

 

They're aluminum. All 10 match. Alcoa makes these for KW. Might be able to get them through a KW dealer, or check with some junkyards.

 

The spring on the service side of the chamber is the one that Is pulling on the rod. So it is possible that spring broke or is weak.

Try pulling the clevis pin and see what moves the easiest by hand, pulling the rod out or moving the s-cam. While you’re at it check for slop in the s-cam bushings.

Looking at the picture ya posted, look to the left of the s-cam bushing it looks shiny.... a sign of lack of grease and possible worn out bushings.

Slight chance of it being the slack adjuster. But generally when they fail they back the brake off, that is unless they start seizing due to a lack of grease.

Every time I’ve seen this problem it’s been cammed over or not greased. But since ya said the brakes are nearly new they won’t cam over. On brake chambers I’ve seen diaphragms give up or the housing break due to rust and even the mounting studs break out of the can but I have yet to see a broken spring. But hey I ain’t seen everything.

 

My thought is the park brake spring could be broken and is offering no resistance to the rod moving in when tightening the adjuster.

These plates with the slot in them were loose from the axle. That's what brought this to my attention.

3 put of 4 were either loose or not attached at all to the axle. One of them I was able to get lined up and put new bolts in without touching the adjuster. The other 2 I had to loosen the adjuster all the way out in order to get the holes lined up.

Once lined up and tight I went to adjust the brakes and noticed the pushrod on the can moving in instead of the adjuster pushing the shoes against the drums.

My confusion is that the pushrod shouldn't move at all when adjusting the brakes, at least not until the shoes touch the drums and at that point the adjuster shouldn't turn any more.


I'll attach the pics of both a correct and incorrect mounted bushing so you can see what I mean I had to do.

 

If you backed them all the way off then you pulled the piston back too and the rod will travel back in same amount and then the S-cam will start turning.

 

God to see you Tony. Been awhile.

 

That slot has nothing to do with those slack adjusters they are for a different style adjuster. They are merely holding the inner s-cam bushing in place.

This also tells me it ain’t been greased in a long time. Ya don’t get that many bolts backing out quickly and it would be easily seen when greasing.

The park brake spring will push the rod out not pull it in to the can.