Brake Upgrade Kits for 1947-59 Chevy GMC 3600-3800 Trucks
Built for the heavier-duty side of the Advance Design and Task Force generations, these brake components serve 1947-59 Chevy and GMC 3600 and 3800 trucks. Compare 8-lug front disc conversions, vacuum and hydraulic power-assist systems, and configurations designed around classic 3/4-ton and 1-ton pickups.
Brake Systems for Chevy/GMC 3600 and 3800 Trucks
The 3600 and 3800 bring one defining requirement into the brake conversation: these heavier-duty trucks are built around an 8-lug setup. That changes the conversion from the start, especially when you retain the original straight axle and wheels.
POL’s front disc systems preserve that 8-lug format while replacing the older drum hardware with 12-inch rotor and hub assemblies and tapered roller bearings. Separate bearing adapters accommodate the spindle variations found across 1947-52 and 1953-59 trucks.
Wheel position also changes with the conversion. The mounting surface moves outward approximately one inch per side, making wheel clearance and overall track width part of the upgrade. Standard and Deluxe versions then separate the basic conversion from packages with drilled and slotted rotors, powder-coated calipers, and stainless hoses.
Power assist follows a different set of year breaks, with firewall- and frame-mounted systems, BlackOut options, Hydropower, and an LS-compatible booster for 1955-59 trucks. Together, these parts treat the heavier 3600 and 3800 as their own brake platform rather than an 8-lug version of a 3100.
FAQ
How do I choose the right brake kit for my 1947-59 Chevy or GMC 3600/3800?
Start with the exact truck year and confirm whether you have a 3600 3/4-ton or 3800 1-ton application. Then identify the front axle and spindle configuration, wheel size, 8-lug pattern, and existing brakes. If adding power assist, also check the master cylinder location, pedal setup, available engine vacuum, and whether you want a firewall- or frame-mounted system.
Can I convert my Chevy 3600 or 3800 to front disc brakes and keep the 8-lug wheels?
Yes. The dedicated front disc conversions in this collection retain the 8-lug bolt pattern rather than converting the truck to a lighter-duty 5- or 6-lug arrangement. POL's system uses 12-inch rotor/hub assemblies, calipers, tapered roller bearings, bearing adapters, hoses, seals, mounts, and related hardware.
What is the difference between the standard and Deluxe 8-lug disc brake kits?
Both are designed around the 1947-59 Chevy/GMC 3600 and 3800 straight axle and use 12-inch 8-lug rotors with a tapered roller bearing conversion. The Deluxe kit adds drilled, slotted, zinc-coated rotors, red or black powder-coated calipers, and stainless steel brake hoses.
Will the 8-lug disc brake conversion fit my original wheels?
Wheel clearance needs to be checked carefully. POL states that factory-style 15-inch 8-lug wheels may need modification because manufacturing tolerances can affect disc brake clearance. The Deluxe product information states that 16-inch artillery wheels work with the conversion without modification. The conversion also moves the wheel mounting surface outward approximately one inch per side.
Does the disc brake kit work with different 1947-59 spindle versions?
POL's standard 8-lug kit includes bearing adapters for two spindle variations. One set is associated with 1947-52 spindles and another with 1953-59 spindles. This allows the kit to accommodate the spindle differences found across the model-year range, but the existing axle and spindle should still be identified before installation.
Which power brake setup should I choose for a 1947-59 Chevy or GMC truck?
The correct setup depends on the truck year and how you want the system mounted. The collection includes different firewall-mounted systems for 1947-53, 1954-55 1st Series, and 1955-59 trucks, along with frame-mounted options. Conventional vacuum boosters, BlackOut packages, and Hydropower hydraulic brake-assist systems are represented, so engine vacuum, power steering, pedal configuration, and available space should guide the choice.
Are there brake-assist options for a 1955-59 truck with an LS conversion?
Yes. The collection includes a 1955-59 Chevy/GMC firewall-mounted power brake booster kit specifically listed for LS conversions. Because an engine swap can change firewall, valve-cover, and engine-bay clearance, check the booster dimensions and the rest of the installed components before selecting the system.