12″ Rear Disc Brake Kit – 4 Piston – 10/12 Bolt Rear

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  • 12″ Rear Disc Brake Kit – 4 Piston – 10/12 Bolt Rear
  • This system features the S4 4-piston caliper mounted to a 12″ 1 piece slot, drill, zinc plated rotor.
  • Baer systems include a unique billet backing plate that not only acts as a caliper mount, but also houses the bankisa (1-piece) park shoe.
  • This is a more modern (better working) park brake assembly then the more commonly used drum in hat park brake systems.
  • Systems feature stainless steel brake hoses as well as calipers that have D.O.T compliant dust and weather seals.
  • Please check rear flange dimensions on drawing before ordering
  • Please select Caliper Color & Rotor Finish when ordering
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  • 12″ Rear Disc Brake Kit – 4 Piston – 10/12 Bolt Rear
Rotor Size/Type:
12″x 1.020 1 piece rotor
Piston Count:
S4 – 4 piston caliper – Lug mount
Pad Type:
Common 4 piston pad shared on the aftermarket (#DR1 or Hawks #HB100)
Minimum Wheel Size:
Some 15″ or larger (Use template to verify fitment, link below)
Stainless braided brake hoses, Park brake assembly, park brake cables.  Includes Baer’s Verislide brakes to allow the rear caliper brackets to “float” to allow movement of the factory C-Clip axles.


Designed to be used with Stock GM 10/12 bolt with C-clip axles.
Additional Notes:
  • 15/16″ can be used Power or Manual.  Customers that prefer softer pedal feel with less pedal effort use 15/16″ for Power Brakes
  • 1″ with Power is based on good engine vacuum numbers, and that the booster is working corretly
  • Drag race applications with dual rear calipers should use a 1 1/8″ Bore Remaster
  • Port Configuration is based off Drivers seat position.  LP – Left port (Fender side), RP- Right Port (Motor Side)
  • Most all applications will use LP exit.  Fox Mustangs (1979-1993) will use RP due to shock tower clearance
  • Features a 1pc 12″ directionally vaned rotor
  • Perfect match for our Track4 front brake system
  • Fully machined billet backing plate that also holds the banksia park brake assembly
  • Features a “Banksia” park brake. A modern design of a common drum in hat.  Uses the same shoe as the late model Corvette (C5/C6)
  • Complete with all hoses, fittings and hardware
  • Proper banjo fittings (NOTE: Baer does not use any pipe thread fittings)
  • 12″ rotors will fit some 15″ and most 16″ wheels (verify with a template)
  • Standard colors are Red, Black or Silver

The S4 Caliper Features:

  • (4) 10mm cross bolts for maximum stiffness
  • Stainless steel abutments and noise suppression springs
  • Hard anodized aluminum pistons
  • Internal crossover design
  • Dual seals (dust/weather and pressure) to meet D.O.T specifications
  • Machined logo that is hand painted
  • Uses a common 4 piston pad for easy replacements
  • Red, Black or Silver Powder Coat Finish (custom colors available)
  • Available in Front or Rear for that same cosmetic matching look
  • Rear systems incorporate a drum in hat park brake
  • Rear systems for c-clip style axles include Baer’s Verislide self centering brackets
  • Uses correct banjo style fittings, Baer does not use any pipe thread
  • 100% MADE IN USA with US sourced material
  • In stock but may be subject to back order due to material supply issues

Wheel Fitment Guide (copy & paste) – brake_system_fitament.pdf

Additional information
Weight 50 lbs


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