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Autopapyrus · Chevrolet Onix (2nd generation)
https://autopapyrus.com/guides/chevrolet/onix/front-brake-pad-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Chevrolet Onix (2nd generation): Front Brake Pad Replacement

The front brakes on the Onix II are disc brakes with a floating caliper on guide pins. Replace the pads when the friction material is down to about 3 mm, or when the wear sensor triggers, if your trim level has one. The exact procedure for this specific version is not documented in publicly available service materials, so what follows is the general procedure for a floating caliper. Check the tightening torques against the manufacturer's specifications.

Difficulty: Medium Time: 1-1.5 hours for both sides Steps: 16 Tools: jack and jack stands, lug wrench, sockets and wrenches for the caliper bolts (usually Torx or hex; check the size on your car), C-clamp or piston retraction tool, pry bar, wire brush, brake cleaner, caliper guide pin grease (brake-specific), gloves

Part

  • 🔩 front disc brake pad set for the Chevrolet Onix II with your engine (OE GM or aftermarket such as Brembo, TRW, Ate, Cobreq, Textar). It is best to buy a set that includes mounting springs and guide hardware. Always replace pads in pairs, on both sides of the axle. If the rotors are worn below the minimum thickness (stamped on the rotor edge), you will also need new brake rotors

Step by step

16 steps
  1. Park the car on level ground, put it in first gear or P, and chock the rear wheels. With the front wheel still on the ground, slightly loosen the lug nuts.
  2. Raise the front of the car, set it on jack stands, and remove the wheel. Never work with the car supported only by a jack.
  3. Inspect the rotor, the brake hose, and the caliper dust boots. Deep scoring, cracks, a pronounced wear lip at the rotor edge, or a torn boot mean additional parts need to be replaced.
  4. If the caliper is in the way, slightly loosen the brake fluid reservoir cap. The fluid level must not go above the maximum when the piston is pushed back in. Draw off any excess fluid with a syringe.
  5. Remove the lower and upper caliper guide pin bolts (sometimes only one is needed, and the other acts as a pivot). Hold the guide pin with a wrench so it does not turn.
  6. Lift the caliper off the pads and hang it from the suspension spring with wire or a zip tie. Never leave it hanging by the brake hose.
  7. Remove the old pads and note their positions. If there is a wear sensor, disconnect its connector and, if it is a separate part, transfer it to the new pad.
  8. Clean the caliper bracket, the pad seats, and the slides with a wire brush and brake cleaner. Remove rust and dirt so the pads can move freely. Replace the retaining springs with the ones from the kit.
  9. Apply a thin layer of brake-specific grease to the guide pins. If the boots are torn or the pins stick, replace them.
  10. Press the caliper piston all the way back with a C-clamp or retraction tool, pushing through the old pad. The piston must go in straight, without cocking. Watch the fluid level in the reservoir.
  11. Install the new pads. The friction material faces the rotor, and the pad with the wear sensor goes in its original position. Do not lubricate the friction surface or the backing plate, except at the points specified by the pad manufacturer.
  12. Fit the caliper over the pads and tighten the guide pin bolts. Tighten to the manufacturer's specified torque, usually in the range of 25-40 N·m (18-30 lb-ft); verify the exact figure. Do not overtighten.
  13. Install the wheel and tighten the lug nuts by hand in a crisscross pattern. Lower the car and tighten the nuts with a torque wrench to the specified torque (for cars in this class, usually about 100-120 N·m (74-89 lb-ft); verify the exact value).
  14. Repeat the same steps on the other wheel.
  15. Before driving, press the brake pedal firmly several times until it feels hard, because the pistons have been pushed back. Check the fluid level and top it up to the proper mark.
  16. Bedding in the new pads: drive about 200-300 km (125-185 miles) without hard braking, applying the brakes smoothly. If needed, make several moderate stops from 60-80 km/h down to 20-30 km/h without coming to a complete stop, always as traffic conditions allow. Check for squealing, pulling to one side, or pedal pulsation.

Common mistakes and warnings

  • The brake system is safety-critical. If you have no experience working on brakes, have the job done at a repair shop. Do not drive until the pedal is firm and the fluid level has been checked. Brake dust and fluid are harmful: wear gloves, do not breathe the dust, and do not spill fluid on the paint. Change the brake fluid according to the maintenance schedule, usually every 2-3 years.
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