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OBS Big Brakes Upgrade – SMALL WHEELS!

OBS HEADQUARTERS . October 14, 2022 . How to .
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Keep Your 15-inch Billet Wheels and Upgrade Those Brakes

Are you old school? Do you want to keep your OG billet 15-inch sport-style truck wheels? It’s all possible now thanks to the partnership of Pro Performance and Baer Brakes with their all new 1150Kit. In an era where bigger is better, there’s a retro movement lurking below the surface—upgraded braking and performance with old-school looks. We all love the timeless styling and mechanical simplicity of the OBS platform but performance braking is not high on the list. Now there’s a simple solution.

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1150KIT Technical Specifications

Specifically designed to work with 15-inch wheels, the kit includes:

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  • Drilled and slotted front and rear rotors
  • Pads
  • Four flex lines
  • Rear calipers
  • Mounting brackets.

Additional recommended parts are rear axles seals, gear lube, front calipers, wheel bearings, and seals.

Installation is relatively straightforward for an OBS brake upgrade using basic hand tools. It does require removing the rear axles to disassemble the original brake drum backing plates, but then it’s simply a matter reinstalling the axles and the new rear caliper brackets, rotor, and caliper loaded with the new pads. New stainless steel flex lines are included with all the necessary mounting hardware.

The front is as simple as replacing the front rotors and pads. Wheel bearings and calipers can be replaced as required.

Upgrade your brakes, retain your cool wheels, and keep on truckin’!

Specification Detail
Kit Part Number 1150Kit
Minimum Wheel Size 15 inches
Rotor Type Drilled and Slotted
Rotor Position Front and Rear
Caliper Position Rear (front sold separately)
Flex Lines Included 4 (Stainless Steel)
Mounting Hardware Included
Rear Axle Removal Required Yes
Gear Oil Drain Required Yes
Brake Bleeding Required Yes
Emergency Brake Compatible Yes (cable reconnect)
Supplier AZ Pro Performance / Baer Brakes

Contact Pro Performance for rotor diameter, pad compound, and caliper piston specifications.

Still have questions about your 15-inch wheels? Street Trucks answers the top 10 truck wheel questions.

SOURCES
PRO PERFORMANCE
480-420-8175
www.azproperformance.com

BAER BRAKES
602-233-1411
www.baer.com

Step-by-Step Installation Guide

FRONT BRAKE UPGRADE

Step 1: Prepare the Vehicle

Before you remove the front and rear wheels, support the vehicle with properly rated jack stands.

Step 2: Inspect and Remove Front Brake Assembly

Starting with the front, it’s clear that these stock front brakes have served their purpose—but it’s time for them to go!
Remove the stock rotor, caliper, and flex line. Now’s a good time to clean up the backing plate and spindle in preparation for the new parts.

Step 3: Install New Front Flex Line

Install the included stainless steel flex line that included in the kit. Attach the line to the upper control arm with two small stainless steel clamps.

Step 4: Install New Front Rotor and Caliper

Install the new rotor caliper and Baer brake pads.

REAR DRUM-TO-DISC BRAKE CONVERSION

Step 5: Remove Rear Brake Drums

The first thing we can remove are the rear brake drums that just slide off. If the drum is seized to the axle, face tap the outer edge of the drum with a hammer to break It loose.

Step 6: Drain Gear Oil and Prepare Differential

Remove and save stock bolts. Drain and recycle gear oil. Thoroughly clean housing flange.

Step 7: Remove Differential Cross Pin

Remove the differential pin lock bolt from the earner. Most GM vehicles use 5/16-inch bolt head. It is best to use a six-point wrench on this as it may be very tight. Slide the pin out and retain for re­assembly as it is very important to keep your work area and the differential parts clean.
We highly recommend this rear brake conversion kit from AZ Pro Performance. Baer Brakes has a great name that synonymous with braking so we know that this is the perfect partnership for our favorite Chevy trucks.

Step 8: Remove Drum Brake Backing Plates

Next, we can simply unbolt the housing for the brake drum and remove it. We will not be reusing this piece.

Step 9: Prepare and Install Rear Caliper Brackets

AZ Pro Performance supplies the brackets needed for this install, which makes it as easy as possible.
A quick coat of paint and the brackets are ready to install. The hardware comes with the kit and leaves two solid mounting locations for the caliper.

Step 10: Install Rear Calipers and Brake Lines

The final piece of the puzzle is the rear calipers. The mount to the new brackets and grip the rotor perfectly. This corner carver can stop on a dime, and we’re excited to test it out.
The kit includes new stainless rear brake lines. Attach them to the caliper, attach the mounting tab for the flex line to the rear end with the included hose clamp, and realign the factory brake line to match. It’s time to bleed the brakes.

Step 11: Reconnect Emergency Brake Cable

Reconnect the factory emergency brake cable.

Step 12: Reinstall Wheels and Bleed Brakes

Reinstall the 15-inch wheels. The new OBS brakes upgrade perfectly—it’s time to drive!

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