Civic EX 10.3-inch front brakes (knuckles, calipers, rotors)
into Civic CRX

EF Civic EX 1990-1991
→
EF Civic CRX 1988-1991

Yes: the Civic EX 10.3-inch front brakes (knuckles, calipers, rotors) from the Civic EX (1990-1991) fits the Civic CRX (1988-1991) — moderate difficulty, no modifications listed.

Verdict
Fits.
Verified entry · no modifications listed
Verified ✓
Difficulty
Moderate
Mods
None
Category
Brakes

Installation notes

Yes — the 10.3-inch front brakes from a 1990–1991 Honda Civic EX (EF) fit a 1988–1991 Honda Civic or CRX by swapping in the EX front knuckles, calipers and rotors, with 14-inch wheels. The write-up, reprinted on Civicwagon from CRX Resource, says the 1990–91 Civic EX was the only EF fitted with 10.3-inch front rotors, adding nearly an inch of rotor diameter. It recommends pairing them with the EX 15/16-inch master cylinder and booster, and HF CRX and base Civic owners also need DX/EX/Si axles. A separate Civicwagon thread lists which proportioning valve suits each front/rear brake combination and notes that DA Integra knuckles can also be used but are designed for a slightly wider chassis.
Caution

Important caveats

  • 13-inch wheels will not clear the 10.3-inch brakes; the write-up says 14-inch wheels are needed and stock CRX 14-inch wheels may work.
  • Use the matching proportioning valve (1725, 2040, 3540 and 4040 differ by model): 3540 is listed for 10.3-inch fronts with rear drums and 4040 for 10.3-inch fronts with rear discs. The wrong valve can upset front/rear brake balance.
  • HF CRX and base Civic cars also need DX/EX/Si front axles, according to the write-up's parts list.
  • One Civicwagon reply says the booster does not have to change, while the write-up recommends the EX booster with the EX master cylinder.
  • DA Integra knuckles are an alternative but are designed for a slightly wider chassis.
  • No OEM part numbers were confirmed for this entry.

No guide yet — write one or browse all guides.

Reference

D14A1 specs → LEB-H5 specs → D17A2 specs → B18A1 specs → D16A6 specs → B18B1 specs → D16A8 specs → D16W4 specs → EA specs → EC specs → ED specs → EE specs → EF specs → EG specs → EL specs → EM specs → EN specs → EP specs → ER specs → ES specs → ET specs →

Done this swap?

Verify it and help the next builder.

Verified by 0 builders

Sources

2 refs
  1. 01 https://civicwagon.com/discussion/comment/29272
  2. 02 https://civicwagon.com/discussion/comment/259615
Submitted by FitMyBuild research Added Updated

Not the swap you need? Request one →

Comments

(0)
Loading comments…