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Autopapyrus · Toyota Corolla (E120)
https://autopapyrus.com/guides/toyota/corolla/front-brake-caliper-repair-with-rebuild-kit/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Toyota Corolla (E120): Front Brake Caliper Repair with Rebuild Kit

The Corolla E120 has a floating single-piston caliper at the front. Typical reasons for repair: a seized piston, a torn dust boot, seized slide pins, a sticking brake pad, and pulling to one side when braking. If the cylinder bore has corrosion or deep scoring, replace the piston or the whole caliper. Brake work affects your safety, so if you have any doubts, leave it to a repair shop.

Difficulty: Medium Time: 1.5-3 hours per side Steps: 19 Tools: floor jack and jack stands, lug wrench, sockets and wrenches 12-19 mm, torque wrench, brake bleeding hose and catch bottle, hose clamp or C-clamp for the brake hose, copper or graphite grease for the slide pins, special brake grease for rubber parts and the piston, clean brake fluid or brake cleaner, tweezers and a wooden or plastic pick, compressed air (air compressor), fine sandpaper or a brass brush

Part

  • 🔩 front caliper rebuild kit (piston, seal ring, piston dust boot, slide pin boots and bushings). Also get new copper washers for the banjo bolt, fresh DOT 4 brake fluid, and a set of slide pins if they are worn. The piston is not always included in the kit and may be sold separately. Buy the kit for your exact caliper type and rotor diameter
There's a full repair manual for this car Every system, wiring diagrams and torque specs — not just this job. Haynes and 16 more. See manuals →

Step by step

19 steps
  1. Loosen the lug nuts half a turn, raise the front of the car, set it on jack stands, and remove the wheel. Work on one side at a time and leave the other side intact for comparison.
  2. Inspect the hose, the boots, and the pads. If the hose is cracked or bulging, replace it during this job.
  3. Remove the two caliper slide pin bolts (usually 12-14 mm socket), holding the slide pins with a wrench. Take the caliper off the bracket and hang it from a wire. The hose must not carry the caliper's weight.
  4. Remove the pads, anti-rattle shims, and clips, and note the order they go in. If you are only replacing the caliper without disconnecting the hose, go to step 6.
  5. To take the caliper to the workbench, clamp the flexible hose with a hose clamp or C-clamp. Then remove the banjo bolt that holds the hose and put a container under it to catch the fluid. Do not reuse the copper washers.
  6. Remove the piston. To do this, place a wooden block in the caliper opening and apply compressed air to the hose port in short bursts. Keep your fingers away from the piston, because it shoots out suddenly. If you have no compressed air, you can push the piston out by pumping the brake pedal with the caliper on the car, but be careful not to drain the whole reservoir.
  7. Remove the piston dust boot and lift the seal ring out of the groove in the cylinder. Use a wooden or plastic pick. Never scratch the groove with metal tools.
  8. Clean the caliper and the piston with clean brake fluid or brake cleaner. Do not use gasoline, acetone, or solvents. Blow out the passages.
  9. Inspect the cylinder bore and the piston. Light film and barely visible marks are acceptable. Deep scratches, rust pitting, or flaking of the chrome layer on the piston mean you must replace the piston or the caliper. Light corrosion in the cylinder can be removed with very fine sandpaper without noticeably changing the diameter.
  10. Lubricate the new seal ring with rubber-safe brake grease. Fit it into the groove and make sure it is not twisted. Apply a thin layer of grease to the cylinder bore and the piston.
  11. Fit the new dust boot onto the piston and insert the piston into the cylinder. Push it in straight along the axis, without tilting, to avoid damaging the seal. Then seat the boot in the groove of the housing and on the piston.
  12. Remove the slide pins and clean off the old grease and dirt. Inspect the pins: they should move in the bushings without sticking. Replace the boots and bushings and lubricate them with a special caliper slide pin grease. Do not use ordinary multipurpose grease or lithium grease, because they attack rubber.
  13. Clean the pad seats on the caliper bracket to remove rust. Install the pads with the anti-rattle shims. Apply a thin layer of copper grease only to the backs of the pads, never to the friction surface or the rotor.
  14. Mount the caliper on the bracket. Tighten the slide pin bolts with a torque wrench to about 25-35 N·m (18-26 lb-ft) (check the exact value in the manufacturer's service manual). If you removed the caliper bracket, its bolts are tightened more, about 90-110 N·m (66-81 lb-ft) (check the exact value in the manufacturer's service manual).
  15. Connect the hose with new copper washers on both sides of the fitting. Make sure the hose is not twisted. Tighten the banjo bolt to about 25-35 N·m (18-26 lb-ft) (check the exact value in the manufacturer's service manual).
  16. Check the fluid level in the reservoir and top up with DOT 4 if needed. Bleed the brakes on the repaired circuit until the fluid is clean and free of bubbles. Order: start with the point farthest from the master cylinder, then move to the nearest.
  17. Press the brake pedal firmly several times until the pads press against the rotor and the pedal becomes firm. Do not lower the car until you are sure the pedal does not sink.
  18. Install the wheel, tighten the nuts in a crisscross pattern, lower the car, and finish tightening the nuts with a torque wrench. For the Corolla E120 wheels, the torque is usually about 103 N·m (76 lb-ft) (check the exact value in the manufacturer's service manual).
  19. Take a test drive at low speed on an empty road. Check that the car does not pull to one side, the pedal is firm, the wheels spin freely, and the rotor does not overheat. After the drive, inspect the connections for leaks.

Common mistakes and warnings

  • The brake system is critical to your safety. If you have no experience with brakes, or if the pedal stays soft after reassembly, do not drive the car and take it to a repair shop. Replace parts in pairs on an axle: if you rebuild one caliper, inspect the other one and, if possible, service it the same way. Brake fluid damages paint and is harmful to skin. If it gets on your skin, wash it off with water. Dispose of used fluid separately.
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