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Electric Brake Assembly - 12-1/4" x 3-1/2" - Right Hand

Electric Brake Assembly - 12-1/4" x 3-1/2" - Right Hand

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10259 - RH Redline Accessories and Parts
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  • Q & A (6)
  • Videos (1)
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Redline Accessories and Parts

  • Trailer Brakes
  • Electric Drum Brakes
  • Brake Assembly
  • Redline
  • 12-1/4 x 3-1/2 Inch Drum
  • RH
  • Self Adjust
  • 12000 lbs


  • Hayes/AL-KO 12-1/4" x 3-1/2" Electric Brake Assembly - Right Hand
  • Capacity: 12,000 lbs per pair
  • Fits: 9K through 12K axles
  • Mounting studs included

K23-529-00 Electric Brake Assembly - 12-1/4" x 3-1/2" - Right Hand

Replaces 186900, 10259, and K568255.1

Item # 10259

Video of Electric Brake Assembly - 12-1/4" x 3-1/2" - Right Hand

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Redline Trailer Brakes 10259 Review

Today we are going to take a look at the Hayes/AL-KO 12.25 inch by 3.5 inch passenger side electric brake assembly for 9,000 pound to 12,000 pound axles. Electric brakes are easier to install. They offer more user control than hydraulic brakes. They will require only an electric brake controller, there is no actuator hydraulic lines necessary. This is a 12.25 inch by 3.5 inch passenger side electric brake assembly, and the size of it, when they say 12.25 by 3.5. The 12.25 would be measured from this edge all the way across to this edge, so if we put a ruler on it, 12.25, and then the 3.5 would be if we turn it and measure the width of the pad.

It's right at 3.5 inches. This is the right hand passenger side assembly and the way to tell that is, when you receive a new one you always have a sticker that will tell you but if that sticker wasn't on there the best way to know on this assembly is if you look at the magnet and the actuating arm. The magnet will always be at the bottom of the assembly, and this actuating arm will always face the front of the trailer. So in that case, that means it would have to be this way, which means it would be a passenger side assembly. That's the easiest way to tell. Now, the pads themselves on these brake shoes, they use a friction material which is fully bonded. It's not riveted to the shoes, gives a lot longer life, more braking torque and the lining, right on the ends here, they do have a taper, or edge, to them and this is to prevent cracking and crumbling that can lead to mechanical back-up.

This is a self adjusting brake, you can tell that by the steel cable that goes right around here and hooks to a lever on the adjust, and this lever goes to the adjustment wheel. The self adjusting brake does not require your periodic manual adjustment like you do on standard brakes. Basically on this one, after you install it, you make your initial adjustment and then they will self adjust as you go. On the back here, you notice it does fit a 5 bolt brake mounting flange. You can see the bolts and the nuts right here are all included for installation. This assembly is certified by USSAE standards and again just to go over a few specs on this.

The dimensions again it's 12.25 by 3.5 inch size. Fits an axle rating from 9,000 pounds to 12,000 pounds. This is a right hand passenger side assembly. It does require the use of 12.25 inch brake drums and these are electric brakes so you do need to connect them to power. You can see these two red wires coming out the back.

One of them will be connected to the brake feed, one goes to a nice clean ground and you can use either wire can be used for either function. They are both red wires so it doesn't matter which one's used for which. That should do it for the review on the Hayes/AL-KO 12.25 inch by 3.5 inch passenger side electric brake assembly for 9,000 pound to 12,000 pound axles.

Customer Reviews

Electric Brake Assembly - 12-1/4" x 3-1/2" - Right Hand - 10259

Average Customer Rating:  5.0 out of 5 stars   (2 Customer Reviews)

- 10259

Product fit as it should very nice qual ity

- 10259


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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B

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