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E30 Secondary Caliper Kit Overview

October 23, 2018 Braking, General Talk, Installation 0 Comments

If you are reading this, you have probably purchased or are about to purchase our E30 Secondary Caliper Kit. Please reach out to us here with any questions, comments or product inquiries. As well, we always like to see our customer installs, if possible please send pictures to

Prior to installation:

  • Make sure this installation overview has been fully read and you have a complete understanding of the required work.  If you do not feel comfortable doing the job yourself, we recommend that a licensed mechanic and fabricator be used to complete the work.
  • Ensure the vehicle has been raised off the ground in a safe manner and is well supported on jack stands or other. NEVER rely on the jack to support the vehicle.
  • It is advisable for the rear shocks to be removed for extra access to the brake area.

What you receive with this kit:

1x Left Side Billet Secondary Caliper Mount

1x Right Side Billet Secondary Caliper Mount

8x M10 x 40mm SHCS Fasteners

2x M10 x 20mm SHCS Fasteners

2x Weld on support tabs

Stock Caliper Removal:

  • Remove the factory calipers and separate their carriers from them. Once removed, hang the calipers up so they are not hanging by their brake lines. It is not necessary to disconnect the stock calipers.

Dust Shield Cutting:

  • Temporarily put the provided caliper mounting bracket in place. Line up your new secondary caliper and carrier with the mounting holes of the new bracket (The images above and below depict orientation of the secondary caliper bracket).

  • Mark how much of the dust shield must be trimmed in order to clear the secondary caliper. The image below provides a good idea of how far you must trim the shield.

Weld on Support Tab:

  • Take the steel support tab included in the kit and bolt it to the outer side of secondary bracket (see above image for reference). This tab is to be welded to the factory trailing arm. With the provided caliper bracket still in place, mark out roughly where the tab will locate. Clean and prepare this location for welding.
  • Once cleaned, bolt everything together. The provided 40mm long fasteners locate through the secondary bracket and thread into the factory caliper carriers. The 20mm fasteners locate through the end of the caliper bracket and thread into the steel support tab. Ensure the calipers fit in their correct locations and the factory carrier brackets do not rub on the rotor. As well, verify the rotor is centred in the carrier brackets.

  • Once alignment of the carrier brackets have been verified the steel support can be tack-welded to the trailing arm. It is recommended to remove the secondary carrier from the bracket to provide access for tack-welding, however leave the stock carrier bolted tight as to not loose positioning of the support tab.

Welding the Support Tab:

  • Remove the stock caliper carrier and the secondary bracket from the car. Be sure to protect any near-by components from the welding procedure. Fully weld the tab to the trailing arm. It is advisable to weld slowly to not introduce excessive heat into the trailing arm casting and wheel bearing. Once welded, be sure to paint the tab and surrounding area to prevent corrosion.

Final Caliper Installation:

  • Once the support tab has been welded and painted, the brakes can be reassembled. Once they are all bolted up and clearances are double checked, torque all fasteners to the factory specifications.


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