What acticates self adjuster in drum brake?
What acticates self adjuster in drum brake?
(OP)
I asked this question at hobby-level automotive forums but I got conflicting answers. Some say braking in reverse motion moves the adjuster. Others say engaging parking brake. And that's for the same car.
So here is my question for automotive engineers. Is there a way to tell just by looking at it if it is parking brake activated or braking-in-reverse activated? Thanks.
So here is my question for automotive engineers. Is there a way to tell just by looking at it if it is parking brake activated or braking-in-reverse activated? Thanks.





RE: What acticates self adjuster in drum brake?
Almost all of the self adjustment devices actuate from the rear shoe. The rear shoe is anchored at the top in forward rotation, but when in reverse, the front shoe is anchored, allowing the rear shoe to move a little more.
There are generally two types of self adjustments, the cable type that lifts the arm, and the link type that allows the arm to drop, both actuating the star-wheel adjuster. The two types are NOT interchangable.
The self adjustment mechanism should actuate in normal driving anyway.
Franz
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RE: What acticates self adjuster in drum brake?
TTFN
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RE: What acticates self adjuster in drum brake?
Rod
RE: What acticates self adjuster in drum brake?
I needed to hear from the source rather than not-always-truthful-internet.
RE: What acticates self adjuster in drum brake?
That's why they call it a "self" adjuster, because you (yourself) are the one crawling under the truck cussing about your worn out brake adjusters :)
RE: What acticates self adjuster in drum brake?
Carnage, when I do rear brakes on my trucks (the only thing around here with self adjusters) I have replaced the actuating cable and guides each time...so far after 30+ years of Dodges, no problems...Now the Chebbys, that's another matter.
Rod
RE: What acticates self adjuster in drum brake?
Several years ago, I sold an old Sioux valve machine that had a lifter refacer attachment. I also still have a babbit shaver and my old prussian bluing bottle. Somewhere I have my old glass surface for checking flatness, a sneaky pete, and who knows what else.
Thanks for the memories, it hurts to think back 40 years ago!
Franz
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: What acticates self adjuster in drum brake?
Hint: Franz and Rod are right.