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Brakes/ABS

ABS actuator and brake booster pump failure

2013–2019 Mazda Axela 2.0 L petrol · BYEFP

Replace the ABS actuator and brake booster pump assembly on a 2017 Mazda Axela (BP/BZ) HEV and bleed the brake system.

Difficulty
Garage job
Time
3h
Parts
2
Sources
5

Before you start

  • The ABS and brake booster are part of the vehicle's primary safety system; improper work can lead to loss of braking ability.
  • Hybrid high‑voltage components are present in the engine bay. Disconnect the 12 V battery and wait at least 5 minutes before starting work to avoid accidental energization.
  • Brake fluid is corrosive; avoid skin contact and keep it away from painted surfaces.
  • Do not drive the vehicle until the brake system has been fully bled and ABS codes cleared.
  • Improper torque on mounting bolts can cause pump mis‑alignment or leaks; verify torque values against the factory service manual.

Steps

  1. Prepare vehicle Park on a level surface, engage the parking brake, and disconnect the negative terminal of the 12 V battery. Wait 5 minutes to allow any residual hybrid system voltage to discharge.
  2. Lift and secure the vehicle Jack up the front of the car, place jack stands under the front subframe, and remove the front driver‑side wheel.
  3. Access the ABS actuator Remove the plastic splash guard under the engine bay (fastened with 12 mm bolts). Locate the ABS actuator/pump unit mounted to the brake booster on the driver‑side firewall.
  4. Drain brake fluid Place a catch pan beneath the master cylinder. Open the brake fluid reservoir cap, then loosen the bleed nipples on all four wheels one at a time, allowing fluid to flow into the pan until the system is empty.
  5. Disconnect hydraulic lines Using a line wrench, carefully loosen the hydraulic fittings on the actuator’s inlet and outlet ports. Plug the lines with appropriate caps to prevent contamination.
  6. Unbolt the actuator assembly Remove the mounting bolts (typically 14 mm) securing the actuator to the brake booster and firewall. Keep track of bolt locations.
  7. Remove the faulty unit Extract the actuator/pump assembly from the engine bay. Inspect surrounding hoses for signs of corrosion or wear.
  8. Install the new actuator Position the new ABS actuator/pump in the same location. Re‑install the mounting bolts and torque them to the specification listed in the factory service manual (verify before tightening). Re‑connect the hydraulic lines, ensuring a snug fit.
  9. Refill brake fluid Close the bleed nipples. Fill the master cylinder reservoir with fresh DOT 4 brake fluid to the “MAX” line.
  10. Bleed the brake system Starting with the wheel farthest from the master cylinder (right rear), have an assistant press the brake pedal while you open the bleed nipple. Close the nipple before the pedal is released. Repeat until clear, bubble‑free fluid emerges. Continue with left rear, right front, then left front. Verify pedal firmness.
  11. Reconnect battery and clear codes Reconnect the negative battery terminal. Use an OBD‑II scanner with ABS capability to clear any stored ABS fault codes and to verify that the system reports normal operation.
  12. Final inspection and test drive Inspect all connections for leaks, ensure the brake pedal feels firm, and verify that ABS warning lights are off. Perform a low‑speed test drive, checking for proper brake response and ABS activation (if possible).
  13. Re‑install wheel and lower vehicle Mount the driver‑side wheel, torque lug nuts to 100 Nm (verify against manual), lower the car, and remove the jack stands.

Parts

  • ABS actuator / brake booster pump assembly — OEM replacement for 2017 Mazda Axela 1.5 L/2.0 L HEV (BP/BZ) ×1
  • Brake fluid — DOT 4, 0W‑20 API SN equivalent ×1 bottle (≈1 L)

Tools

  • 12 mm and 14 mm socket set
  • Torque wrench
  • Brake bleeder kit or vacuum pump
  • Jack and jack stands
  • Wheel lug wrench
  • Flat‑head and Phillips screwdrivers
  • Line wrench (flare‑type, 8 mm)
  • OBD‑II scanner with ABS/hybrid capability
  • Fluid catch pan
  • Clean rags

Sources

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