D-24 brake adjustment

[_shel_ny]

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Edited September 11, 2011 by shel_bizzy_48
add info

[Guest P15-D24]

Having to pump the pedal is the classic symptom of air in the lines. You must fix that before trying to adjust the shoes. You should be able to bleed out the entire system with two or three passes around all the bleeders. If not, you have a leak which you must fix before trying to do the shoe adjustment.

[55 Fargo]

Shel, could this seepage been from sitting out in the cold all winter not being used, will they seat again and you might be good to go, my reas had seepage in the boots, but are not leaking antyhting out yet, might have to do what you did. I am running Dot 5 silicone ........Fred

[55 Fargo]

Shel, with Raybestos wheel cyls only 2 years old, the leaking must be caused from sitting long periods of time, or not. What else could it be?

[RobertKB]

When you leave a car sit more than a week or so you should make sure you go out once a week and pump the brake pedal. This keeps your residual pressure up in the entire brake system and helps to prevent leaks from developing from just sitting.

[blueskies]

Now my tiny mind says to set the dial to -18 to adjust the clearance for the shoes. 1/2 of the 12 being 6, I am adding that to the 12 to get 18.

Shel-

I don't think this is quite right...

Here's what the instructions say:

An undersize or oversize reading is based on the drum's diamter and the shoes must be set using the raduis or one-half the diameter. Therefore, loosen the dial lockscrew and set the dial back one-half the reading. For example, if the original reading is .60" oversize, set the dial back to .030" oversize. If the original reading is .010 undersize, set the dial back to .005" undersize.

The guage is simply set by taking the diameter reading of the drum, and converting it to the radius (half of the diameter) which is then transfered to the shoes by the guage when it is put on the spindle.

Seems to me that you might not be reading the guage correctly? The guage has three holes in it marked for the drum diameter, 10", 11", and 12". Make sure you have the dial pin in the right hole for your brake drum size, and the extension pin needs to be set to the same corresponding 10", 11", or 12" length. If your drums were like new, the dial would read 0, meaning not over or under sized.

I set my shoes to fit the exact diameter of the drum, and then backed off the minor adjustment to get the drum on. Then re-adjusted the minor adjustment by feel.

The major adjustment affects the minor, and vice versa. I had to do several rounds of adjusting both of them to get the shoes centered in the diameter of the drum...

Pete

[Normspeed]

Almost forgot. Started r/r as I should, and after about 4 pump and hold attempts I could not get any fluid into the jar. At that point I found the puddle on the floor at the l/r. Line not tight at the wheel cylinder.

\

Shel, you and I might be twins, separated at birth

[Guest P15-D24]

You have a leak letting air back in! They can be very difficult to track down but it isn't always a wheel cylinder. You need to check all joints and lines for cracks. You will never get it adjusted if you still have a leak.