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Rear Drum Self Adjusting System?

yv1650c

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yv1650c Enthusiast

yv1650c

Posted
Posted

Hi, I have a 08 NBS reg. cab with rear drums.

Is a myth they're self adjusting?

 

If it is true, how can i use the self adjusting system? (My dad say that breaking y R.. i do not knwo, beacuse i cannot feel differences).

 

 

thank you.

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

Drums have a mechanical self-adjustment system built inside. Generally, every time you back up, they adjust a little bit to keep shoe wear even. However, this system does have its shortcomings. For example, if you purposely park such that you never have to back up, your rear brakes will never adjust. This can cause poor braking and excessive wear on the front pads. On the opposite side of the spectrum, if you back up too much (plowing parking lots, for example) you can over-adjust your brakes and cause them to lock up.

 

If you need to adjust them by hand, there is a small access hole on the backing plate that you can use. Remove the plug, and using a small flat screwdriver, reach in and turn the thumbwheel so that the screw extends.

minibike132 Senior Enthusiast

minibike132

Posted
Posted
Drums have a mechanical self-adjustment system built inside. Generally, every time you back up, they adjust a little bit to keep shoe wear even. However, this system does have its shortcomings. For example, if you purposely park such that you never have to back up, your rear brakes will never adjust. This can cause poor braking and excessive wear on the front pads. On the opposite side of the spectrum, if you back up too much (plowing parking lots, for example) you can over-adjust your brakes and cause them to lock up.

 

If you need to adjust them by hand, there is a small access hole on the backing plate that you can use. Remove the plug, and using a small flat screwdriver, reach in and turn the thumbwheel so that the screw extends.

 

What he said, also if you want to check adjustment without a gauge try this. With the rear wheels off the ground (MAKE SURE TO BLOCK THE FRONT WHEELS SO IT DOESN'T GET AWAY FROM YOU) truck in neutral spin the rear wheels. You should feel enough drag so that when you give it a good spin and let go it will only spin about 1 to 1 1/2 revolutions. If it freewheels your too loose, start cranking on that adjuster till you get some drag.

yv1650c Enthusiast

yv1650c

Posted
  • Author
Posted

thank you...

How many times should i break when back?

SHould i breack until the truck stop? or if i got back and brake, no matter if it stop it;'ll be graduated.

 

I look easier use the sefl adjusting.

 

Here is the problem, my front pads only last about 14.000km.....

 

GM should eliminate from ther production this sistem.. rear disc is the best!, not adjusting needded! :crackup:

yv1650c Enthusiast

yv1650c

Posted
  • Author
Posted

AS i see here, theres two types of self-adjusting sys..

one activates trought the emergency brakes, other when you bakcup...

 

wich one do the truck has?

07Graystone Enthusiast

07Graystone

Posted
Posted

Here are my thoughts on this subject. My drum brakes work great. The self adjusters work great as well. I usually find an empty parking lot, back up straight at between 5 and 10 mph, then jab the brakes 3 to 4 times before coming to a stop. On the way out of the parking lot, I can feel that the brakes take effect slightly higher in the pedal travel. There is no way to self adjust your brakes enough to lock up the back wheels, it doesn't work like that. Good Luck!

Mikeee Enthusiast

Mikeee

Posted
Posted
... There is no way to self adjust your brakes enough to lock up the back wheels, it doesn't work like that. Good Luck!

Only if you use the "spoon & star-wheel" method.

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