Rear disc brake trailing arm assembly

Brakes Rear drum-to-disc conversion Verified Modification Required

Compatibility Overview

Source Vehicle

Civic Si

Generation: EM1

Years: 1999-2000

Target Vehicle

Civic (rear drum brakes)

Generation: EG/EK

Years: 1992-2000

Installation Difficulty

Easy Basic tools
Moderate Some experience
Difficult Skilled work
Expert Professional

Reference

D14A1 specs → B18A1 specs → D16A6 specs → B18B1 specs → D16Z6 specs → D16W4 specs → EA specs → EC specs → ED specs → EF specs → EG specs → EK specs → EL specs → EM specs → EN specs → EP specs → ER specs → ES specs → ET specs → EW specs → S20 Hatchback/del Sol Transmission (EH2 , EG1) → PLE Cylinder Head → PLE →
Rear disc trailing arms from a 99-00 Civic Si, any 94-01 Integra, or a Del Sol bolt onto the drum-brake EG/EK Civic chassis. Trailing-arm and parking-brake-cable lengths are reported to match across 88-91 and 92-95 Civics and 90-93 and 94-01 Integras, so donors are interchangeable. Transplanting the complete trailing arm is simplest; the hub-and-brake-only approach also works and skips the rear alignment. Required extras beyond the arm: matching rear brake pads, rear brake lines (Si or Integra), new parking-brake cables, and the disc-spec proportioning valve plus master cylinder for correct bias. Replace the trailing-arm bushings before installation, confirming the bushing size matches the donor arm.
The brake hardware itself bolts up, but the hydraulic bias must be corrected. On any chassis other than an EX with stock or soft suspension, swap in the disc-spec proportioning valve (Civic Si, or an earlier Integra valve marked 4040 with two inlets and four outlets) and typically the Civic Si 15/16 master cylinder to prevent rear lockup. Junkyard trailing arms usually come with the parking-brake cables and brake lines cut, so new cables are needed; Civic Si cables fit directly, while Integra cables may require minor fabrication on some Civics. If the donor came from an ABS car and the recipient has none, disconnect the ABS wheel-speed wiring. Choosing to transfer only the hub and brake assembly instead of the whole arm avoids a rear alignment but exposes the Torx T50 retaining bolts, which strip easily.

Important Caveats

  • • Skipping the proportioning valve and master cylinder on stock or soft suspension can lock the rear wheels and cause loss of control; only lowered cars on stiffer springs are commonly reported to brake acceptably on the stock valve.
  • • The main trailing-arm bolts thread into captive nuts welded inside the frame and can shear or spin free; penetrating oil and patience are essential.
  • • Retaining fasteners are Torx T50, not hex; using a hex key strips them.
  • • Integra bushings are sometimes larger than Civic bushings, so a polyurethane kit must match the specific donor arm.
  • • Some listings describe the Si master cylinder bore as 7/8 rather than 15/16; verify by measurement or part number before purchase.

DIY Installation Guide

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Community Verification

1
user verified this swap
By Rexinre via D-Series.org
Added 2 days ago

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