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Wilwood Rear Disc Brake Kit | 4 Piston, 12.19 inch, Lg Bearing | 66-75 Ford Bronco SKU: 140-13733N
Wilwood Rear Disc Brake Kit | 4 Piston, 12.19 inch, Lg Bearing | 66-75 Ford Bronco
Product Overview:
This Wilwood DPL Pro-Series Rear Disc Brake Kit provides a complete solution for your 66-75 Bronco rear axle with Small Ford flange and bearing and compliment front big brake upgrades available for Bronco platform.
Requires minimum 15 inch wheel diameter. Not all 15" wheels will fit. Consult the Wheel Clearance Diagram in additional images to confirm fitment before purchasing.
Full description
This Wilwood DPL Pro-Series Rear Disc Brake Kit provides a complete solution for your 66-75 Bronco rear axle with Small Ford flange and bearing and compliment front big brake upgrades available for Bronco platform.
Requires minimum 15 inch wheel diameter. Not all 15" wheels will fit. Consult the Wheel Clearance Diagram in additional images to confirm fitment before purchasing.
Requires minimum 15 inch wheel diameter. Not all 15" wheels will fit. Consult the Wheel Clearance Diagram in additional images to confirm fitment before purchasing.
Wilwood Dynapro Lug Mount Rear Disc Brake Kit | 66�75 Bronco, Small Bearing
Upgrade your Bronco's stopping power with the Wilwood Dynapro Lug Mount Rear Disc Brake Kit, engineered for 1966�75 Ford Broncos with small bearing rear axles. This performance kit is a direct-fit solution for Broncos originally equipped with 10" drum brakes and rated with 2700 or 2900 GVW. Featuring forged billet 4-piston Dynapro calipers, 12.19" vented lug-mount drum/rotors, and high-friction pads, this kit delivers modern braking force to match front big brake upgrades. The internal shoe-style parking brake ensures superior static holding power with a clean installation.
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Fits 1966�75 Small Bearing Broncos: Designed for stock axles with OE 10" drum brakes and 2700/2900 GVW ratings.
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Forged Billet Dynapro Calipers: 4-piston performance calipers offer powerful and consistent braking force.
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12.19" Vented Lug-Mount Rotors: One-piece rotors enhance heat dissipation and improve brake balance.
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Internal Parking Brake System: Hidden shoe-style parking brake provides clean looks and excellent holding power.
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Small Ford Flange Fitment: Compatible with 2.36" axle offset and small bearing (2 7/8" OD bearing).
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Personalizable Options: Choose from optional caliper finishes and rotor styles to match your build's look.
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Requires 15" Wheels or Larger: Check clearance diagram to confirm fit with your wheels.
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Brake Lines Sold Separately: Kit does not include flex lines � must be purchased to complete install.
Boost braking performance with Wilwood's lug mount disc brake kit for 66�75 Bronco small bearing - 4-piston calipers, 12.19" rotors, integrated parking brake.
Specifications
| Specification | Detail |
|---|---|
| Pistons | 4 |
| Rotor Diameter | 12.19" |
| Caliper Mount | Lug |
| Wheel Diameter | 15" minimum required |
| Flange | Big Ford (Bronco) |
| Axle Offset | 2" |
| Finish | Black calipers |
| Parking Brake | Integrated internal drum-in-hat design |
CAREFULLY CHOOSE THE RIGHT KIT
Let's cover some basics. The rear end refers to the entire rear axle assembly. The different parts of the rear end are the brakes, axles, axle housing, and the third member. The most common question we are asked is "How do I tell if I have a large or small bearing rear axle?" You can easily identify if you have large or small bearing axles by examining the ends of the axle housing.Photo 1 shows a small bearing axle housing. If you look close at the housing right where it meets the backing plate, there is no noticeable size increase where the axle bearing pocket is. Photo 2 and 3 show a large bearing axle housing and you can see a noticeable size increase where the axle housing meets the backing plate. If you have loose axles laying around, you can simply measure the outside diameter of the bearing. The small are 2.835" or just under 3" and the large are 3.150" or just over 3".
There are 4 different sets of rear axles that would have come stock in 66-77 Broncos. The original applications are as follows:
1. 66-75 small bearing,
2. 66-75 large bearing,
3. 74-75 medium duty large bearing, and
4. 76-77 large bearing.
Each of these sets have a driver and a passenger side axle. Each of these sets use corresponding backing plates and brake drums. The backing plates and drums are particular to each set and are not interchangeable with the exception of the 66-75 small bearing and 74-75 medium duty large bearing using the same brake drum.
So, how can you identify which large bearing set you have? it can be narrowed down this way: The inside diameter of the Bronco rear brake drum is approximately 10" or 11". So, if you have a large bearing and a 10" brake drum, you have what we call a 74-75 medium duty setup. That leaves us with the 66-75 large and 76-77 large. Both use an 11" brake drum. The 66-75 uses a narrower drum and corresponding brake shoes. We identify this as 11 X 1 3/4". The 76-77 uses an 11 X 2 1/4" drum and shoe. Note the difference in the backing plates * in photos 2 and 3. Photo 2 shows a 66-75 large bearing with 11 X 1 3/4" brakes. Photo 3 shows a 76-77 with 11 X 2 1/4" brakes. If you look close you can see the backing plate of the 66-75 appears wider. Please note that all of the original axle sets were 28 spline. See Photo 4. With an increase in spline count comes an increase in outside diameter of the axle and so you get an increase of strength. A very common upgrade is to install a set of 31 spline axles. All that is necessary to do this is a set of axles and a new differential and we would recommend a third member rebuild kit. 35 spline axles are another step up in the strength department but usually require a new differential housing. The 35 spline axle is common for the extreme rock crawlers.
The third member, also known as the differential housing, hogs head, and chunk, holds the differential, ring and pinion gears, and bearings. This is the part that bolts into the center of the axle housing. See photo 5. You have three choices of gear ratios that were stock. They would be 3.50 which is the most common, 4.11 and 4.56. There are many other ratios that can be used as well. The differential refers to the ring gear carrier and came stock either open or limited slip "posi" type. There are numerous upgrades such as Detroit Locker, ARB air locker, electric lockers, etc.
Instruction 1
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