What causes screeching brakes ?

My company has (2) Freightliner M2-106 dual-axle 40 ft flatbeds.

One has 12k miles, the other has 172k miles on it.

The one with 171k miles on it has brakes the SCREECH like a freight train coming to a stop. The noise is extremely loud and persists UNTIL the brakes have been applied numerous times. THEN, the screeching just "goes away" until the next morning. Then the screeching routine starts again.

The brakes on the newer truck with 12k miles NEVER screech. Ever.

We took the 171k into the shop two weeks ago to have the brakes inspected. The shop returned us the truck and said they "adjusted" the brakes AND there is plenty of material (brake shoe lining) left on them. However, the braking performance DID improve dramatically and the screeching "went away" for about 2 weeks. It's now returned.

Now, I have NO idea if they actually removed the tires/drums and inspected each brake. My suspicions are they did not.

Anyways, WHY would the brakes continue this screeching ...... (every morning)..... and stop screeching once they get warmed up a bit ?

If I didn't know any better, I would think the shoe lining is SHOT and the rivets are scrapping the inside of the drums.

Like I said earlier, once the brakes get warmed up a bit, the screeching goes away and the brakes seem to work just fine.

Just wondering WHY this truck gets the horrible screeching every morning. ??

What say you ?

 

I was thinking glazing as well.

I've only been with the company a year. Other driver 4 years says it's NEVER had any brake work on it since he was driving it. I inherited the truck from him when we got the new truck in.

 

Yes, I agree.

It's due to go in for an oil change soon. I'm going to insist to our Mgr that the shop actually pull the drums off and do a VISUAL inspection.

:RANT ON: ;>) I've only had my CDL-A two years and I can't believe my eyes the #### condition and maintenance (actually LACK THEREOF) on big trucks ! Unfuggingbelievable what I've seen in my short time. It's truly frightening to think how many other trucks are in #### shape. The dangers to the drivers and especially THE PUBLIC..... OUR FRIENDS AND FAMILIES is just astounding to me.

You'd #### if I told you about the Cement Mixer I used to drive ! Perhaps I will someday. Talk about a DEATH TRAP ! I quit that job because of the condition of that truck.... (and other things...). I still see that truck on the road !

I've been driving for 42 years. Owned about 100 vehicles in that time period. Worked as a kid in my Uncle's service station and have 1500 hours as an Auxiliary State Trooper. I KNOW how vehicles are "supposed" to be maintained and operated "LEGALLY".

Just blows my mind really........ RANT OFF....... Lol !