Re: Front brakes on a car

Posted by Allan in NE on September 06, 2004 at 06:15:50 from (148.78.243.26):

In Reply to: Re: Front brakes on a car posted by TheRealRon on September 06, 2004 at 03:54:27:

Mornin' Ron,

Call me thick-headed if you want; but I just don't see how an automatic adjuster can ever, under any circumstances, "over tighten".

If it were to be installed "backwards" (end for end) it would, of course, be totally inoperable.

If a left side adjuster were installed in a right side drum (or the other way around), it would be forever "ratcheting" on the pull-stroke and would not tighten a thing.

But, even if the star wheel were indeed moving on the ‘slop’ stroke, it would be always trying to “loosen” the brakes, because the threads of it’s shaft and barrel are backwards (left vs right sides).

Further, by their very design, an automatic adjuster needs lateral "movement" of the shoe(s) assembly against the backing plate to obtain it's throw.

Additionally, since the adjuster assembly is always located at the secondary shoe, this ‘movement’ has to come as a result of the shoes being applied while the vehicle is moving in reverse.

Take it a step further: If the whole she-bang (backing plate, shoe assembly, and the drum) were switched left to right (which is impossible, because of the e-brake cable mounting), the adjuster would indeed engage during brake application during forward motion (if there were enough movement of the shoe assembly against the backing plate). However, it would still only adjust to the “correct” tightness and would not “over tighten”.

The upshot of all this is that the tighter the shoes get to the drum, the less the adjuster mechanism moves until it reaches a point of not moving at all.

Can ya help me out on this one, 'cause my old pee-brain just can't grab the concept. How could an automatic adjuster ever possibly over tighten?

Allan

Follow Ups:

• Re: Front brakes on a car TheRealRon 08:53:05 09/06/04 (4)
  • Re: Front brakes on a car MattOney 10:36:42 09/06/04 (2)
    • rear drum brakes on a car OR truck ChrisH 17:30:53 09/06/04 (0)
    • Re: Front brakes on a car TheRealRon 11:35:51 09/06/04 (0)
  • Re: Front brakes on a car Allan in NE 09:15:16 09/06/04 (0)

Post a Followup Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]