Recall: ABS brake return lines may be connected wrong (some 1991 cars)
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What causes "Recall: ABS brake return lines may be connected wrong (some 1991 cars)" on the Mazda Miata NA (1990-1997), and how is it fixed?
On about 300 1991 Miatas with ABS, a front brake return line was connected to a rear return, so during ABS operation front brake fluid could move to the rear circuit. Fix: Check by VIN; Mazda replaced the ABS hydraulic unit.
Symptoms
No warning in normal braking; when ABS acts, front braking can be lost and stopping distance grows.
Cause
On about 300 1991 Miatas with ABS, a front brake return line was connected to a rear return, so during ABS operation front brake fluid could move to the rear circuit.
Fix (summary)
Check by VIN; Mazda replaced the ABS hydraulic unit. Very few cars, but worth checking on any 1991 with ABS.
Related build entries
Other NA problems
- Short-nose crankshaft (1990 and early 1991)
- Rocker and floor rust from clogged drains
- 1990-93 1.6 uses a smaller 6-inch rear differential
- Cooling parts crack with age and heat
- Verify timing belt and plug service history
- Oil leaks from the CAS O-ring and valve cover gasket
More for this car
- All Mazda Miata NA (1990-1997) fitment answers · NA common problems
- Guide: Miata NA/NB wheel fitment guide: bolt pattern, offsets, 15x8 sizes and brake clearance
- Guide: Miata NA/NB hardtop fitment guide: NA vs NB, OEM vs aftermarket, latches and seals
- Guide: Miata NA vs NB: differences, known problems and which parts swap
- Newsletter archive: past issues with every new and corrected entry
Sources
- NHTSA recall record 91V-079 (1991 Miata with ABS: brake return lines misconnected) — NHTSA recalls API (regulatory; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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