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

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

Item # 10257

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Redline Brake Assembly Accessories and Parts - 10257
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Call 800-298-8924 to order Redline accessories and parts part number 10257 or order online at etrailer.com. Free expert support on all Redline products. Guaranteed Lowest Price and Fastest Shipping for Electric Brake Assembly - 12-1/4" x 3-1/2" - Left Hand. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (2)
  • Q & A (6)
  • Videos (1)
  • Photos
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Redline Accessories and Parts - 10257

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


Features:

  • Hayes/AL-KO 12-1/4" x 3-1/2" electric brake assembly - left hand
  • Capacity: 12,000 lbs per pair
  • Fits: 9K through 12K axles
  • Mounting flange bolt pattern: 5 bolt
  • Mounting studs included


K23-528-00 Electric Brake Assembly - 12-1/4" x 3-1/2" - Left Hand

Replaces 186700 and K568255.2







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


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




Video Transcript for Redline Trailer Brakes 10257 Review

Today we're going to take a look at the Hayes AL-KO 12-and-a-quarter-inch by 3-and-a-half-inch driver's side electric brake assembly for 9,000 lbs. to 12,000 lbs. axles. Now electric brakes are easier to install. They offer more user control than hydraulic brakes. They do require only an electric brake controller to use them.

There is no actuator hydraulic lines necessary. Now the size on this one is 12-and-a-quarter by 3-and-a-half inches. It's the driver's side electric brake assembly, and when they do the size, the 12-and-a-quarter by 3-and-a-half, what they're measuring, the 12-and-a-quarter would be measured from this pad all the way across to this pad. If I put a ruler edge to edge, there's your 12-and-a-quarter, and the 3-and-a-half would be the width of the pad. So again if you put the ruler on here, there's your 3-and-a-half inches, and this is the left hand driver's side. And a good way to tell on this assembly, I mean on a new assembly, it'll have a sticker which will tell you. But if that sticker wasn't there, the way to determine what side this goes on is your magnet will always be at the bottom of the brake assembly and this actuating arm will always face the front of the trailer.

So if we know this is at the bottom, and this is towards the front, then this will show that this is the left hand or driver's side assembly. Now the pads on this, they do use a friction material which is fully bonded. It's not riveted to the shoes. Gives you a lot longer life and more braking torque. The other nice thing on each end, you can see right here they actually chamfer or taper this edge to prevent cracking and crumbling that can lead to mechanical lock-up. Now this is a self-adjusting brake, and the way you can tell that, is this cable that goes around this holder right here and connects to a lever on the adjustment wheel. That's a self-adjusting cable.

So a self-adjusting brake does not require periodic manual adjustment like standard brakes. Basically on this after you install it you make your initial adjustment, and then from then on it will self-adjust as you go. I flip it over to the back here, you can see this fits a five bolt brake mounting flange. Now the mounting bolts and the nuts are all included to install this. This assembly is certified by U.S. SAE standards, and again just the specs on it, it's a 12-and-a-quarter-inch by 3-and-a-half-inch dimension.

It fits axles from 9,000 lbs. up to 12,000 lbs. Again, it's the left hand driver's side. It does require the use of 12-and-a-quarter-inch brake drums, and it is an electric brake, so you do need to make an electric connection. The two wires back here, you can see two red wires. One needs to go to the brake feed, one goes to the ground, and they're both red wires so either one can go for either function. But that should do it for the review on the Hayes AL-KO 12-and-a-quarter by 3-and-a-half inch driver's side electric brake assembly for 9,000 lbs. to 12,000 lbs. axles.


Customer Reviews

Electric Brake Assembly - 12-1/4" x 3-1/2" - Left Hand - 10257

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


- 10257
by:

Great quality 424335



- 10257
by:

product was not to be found locally, and when found at etrailer it was delivered quickly. 286517


2
2

Ask the Experts about this Redline Accessories and Parts

Do you have a question about this Accessories and Part?


  • Brake Assembly Recommendation for Wagner 12-1/4 by 3-1/2 inch Assemblies
  • We have just what you need. The Electric Brake Assembly # 10259 and # 10257 match the dimensions of your assemblies at 12-1/4 by 3-1/2 inch as well as the 6 bolt mounting pattern as well so this would the exact set you'd need. Check out the picture I attached that shows the bolt pattern.
    view full answer...

  • How to Determine if the Electric Brake Assembly # 10259 Would Fit a Trailer
  • The Electric Brake Assembly # 10259 that you referenced is a 12-1/4 inch by 3-1/2 inch assembly that uses a 5 bolt mounting flange. If your Warner axle had a brake assembly that matches that the # 10259 would work well for you. I attached a picture that shows the bolt pattern of this assembly for you to check out as well as a picture that shows where to measure your hub. For the matching left hand side assembly you would want the part # 10257.
    view full answer...

  • Will 6-Bolt Backing Plate of Electric Brake Assembly # 10257 Fit 5-Bolt 7000-lb Axle Brake Flange
  • The Hayes Axle Trailer Brake Assembly you referenced, part # 10257, is intended for 9K- through 12K-rated axles. This brake assembly uses a 6-bolt mounting pattern to attach to the axle brake flanges. This mounting bolt pattern is not compatible with the other brake assembly you referenced which uses a 5-bolt pattern for installation. All of the 12-inch brake assemblies wider than 2-inches that we offer use a bolt pattern other than the 5-bolt and so would require you to install both...
    view full answer...

  • What Is Needed to Convert Hydraulic Brakes to Electric Brakes
  • Yes, you can convert your hydraulic brakes to electric brakes, and if brakes on one axle would give you adequate braking power you can just put brakes on one axle. Basically, you could just install the Electric Brake Assembly, part # 10257, that you referenced on your axle and from there wire it to your trailer connector and the trailer would be ready to be stopped with a brake controller. I attached a video of a hydraulic brake trailer being converted to electric brakes. If you...
    view full answer...

  • What Electric Brake Shoes and Liners are Recommended for 10,000 lb axle Trailer
  • The axle brand definitely does make a difference so that was very helpful to provide. I recommend the Hayes/AL-KO 12-1/4" x 3-1/2" Brake Shoe/Lining Kit # BP04-290 that is compatible with AL-KO axles.
    view full answer...

  • How to Pick Out Replacement Trailer Brake Magnets
  • We carry several replacement trailer brake magnets that are all designed to fit specific models of brake assemblies. If yours don't seem to be close enough to the armature surface of the hub then it would seem that you do not have the correct magnets or your hub isn't seated all the way on the spindle. I attached a link to a page that has all of the brake magnets we carry. You would want to select the brand and brake assembly size from the filters on the page and the correct ones will...
    view full answer...


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Info for this part was:

Installed by:
Jeff D
Expert Research:
Jameson C
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Mike S

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