On the XA50 RAV4, the rear brake job itself is easy — two 14 mm guide-pin bolts for the caliper, two 17 mm bolts for the bracket, 21 mm lugs, and a solid rear rotor that usually just needs a couple of M8 bolts in the jacking holes to break free. What turns it into a job you have to plan for is the electronic parking brake: the motor sits right on each rear caliper, so the pistons have to be commanded back with a scan tool before anything comes apart, and commanded closed again when you're done.
Gas 2.5 and hybrid models use the same rear brake hardware and the same fastener sizes, so the tool list doesn't change. The mistake people make is buying a screw-type piston wind-back kit and trying to twist the rear pistons in like an older Toyota. These aren't manual screw-in calipers — force them and you'll be buying a caliper with an actuator. Rent or buy a scan tool with Toyota EPB maintenance mode, and the whole job goes smoothly.
| Item | Type | |
|---|---|---|
| Bidirectional scan tool Toyota EPB maintenance mode capable (Techstream, Autel, Foxwell NT650/NT7xx, Launch) Puts the electric parking brake motors into service/open mode so the rear pistons retract and the caliper can come off. | Required | shop |
| Breaker bar 1/2 in drive, 18-24 in Loosens the rear lug nuts before lifting the vehicle. | Required | shop |
| Lug nut socket 21 mm, 1/2 in drive, thin-wall or protective sleeve Removes the rear wheels without marring alloy wheel seats. | Required | shop |
| Floor jack 2 ton minimum Lifts the rear of the vehicle at the pinch-weld or rear subframe jacking point. | Required | shop |
| Jack stands 2 ton minimum, pair Supports the vehicle while both rear wheels are off. | Safety | shop |
| Wheel chocks Chock the front wheels since the parking brake will be released and disabled. | Safety | shop |
| Socket wrench set 3/8 in drive ratchet with 10, 12, 14 mm sockets 14 mm for the two caliper guide-pin bolts; 10/12 mm for brake hose and wear-sensor brackets if fitted. | Required | shop |
| Combination wrench 17 mm and 19 mm open end Holds the guide pin from turning if a caliper bolt spins in its bushing. | Recommended | shop |
| Socket 17 mm 6-point, 1/2 in drive Removes the two rear caliper mounting bracket bolts from the knuckle. | Required | shop |
| Breaker bar or long ratchet 1/2 in drive The bracket bolts are torqued high and often corroded. | Required | shop |
| Bungee cord or mechanic's wire Hangs the caliper from the spring or trailing arm so the brake hose and EPB motor harness aren't strained. | Required | shop |
| M8 x 1.25 bolts Two, 40-60 mm long, with 12 or 13 mm hex head Threaded evenly into the rotor's jacking holes to push a rust-seized rotor off the hub. | Required | shop |
| Dead blow or rubber mallet 2-3 lb Frees a stuck rotor by tapping the hat area, not the friction surface. | Recommended | shop |
| Wire brush and/or hub cleaning disc Rotary hub cleaner for drill/grinder Cleans rust and scale off the hub face so the new rotor sits flat and runs true. | Required | shop |
| Wire brush, hand Steel bristle Cleans the caliper bracket abutment surfaces where the pad clips ride. | Required | shop |
| C-clamp or pad spreader 4 in C-clamp Takes up the last bit of piston travel after electronic retraction; do NOT twist these pistons like a manual screw-type EPB. | Recommended | shop |
| Brake caliper hanger hook Cleaner alternative to a bungee for supporting the caliper. | Recommended | shop |
| Torque wrench 1/2 in drive, 25-150 ft-lb Sets bracket bolts and lug nuts to spec. | Required | shop |
| Torque wrench, small 3/8 in drive, 10-80 ft-lb Accurate setting of the 14 mm guide-pin bolts. | Recommended | shop |
| Torx bit T30, plus flat screwdriver Some XA50 rear rotors have a retaining/locating screw and the wheel speed sensor bracket can use a small fastener. | Recommended | shop |
| Brake cleaner Chlorine-free, 2 cans Removes rust preventative from new rotors and cleans caliper hardware. | Consumables | shop |
| Silicone brake grease High-temp synthetic caliper lube Lubricates guide pins, pad ears and the backs of pad shims. | Consumables | shop |
| Anti-seize or hub paste Copper-free, thin film A light film on the hub face only (never on studs or friction surfaces) prevents future rotor seizing. | Consumables | shop |
| Rear brake pad set XA50 rear, ceramic or OE semi-met; includes shims and clips The wear item being replaced; use a kit with new anti-rattle clips. | Parts | shop |
| Rear rotors 281 mm x 12 mm solid rear (verify diameter/thickness on your car), pair Replaced with the pads; most XA50 rears are solid discs. | Parts | shop |
| Brake fluid Toyota FMVSS116 DOT 3 Top off the reservoir after retraction/re-apply cycles if needed. | Consumables | shop |
| Nitrile gloves and safety glasses Brake dust and cleaner spray protection. | Safety | shop |
| Drain pan or catch tray Catches brake cleaner runoff and dust off the caliper. | Recommended | shop |
Rear brake fastener sizes are identical across the 2.5 A25A-FKS gas, the hybrid, and the Prime plug-in: 21 mm lug nuts, 14 mm caliper guide-pin bolts, 17 mm caliper bracket bolts. Rotor diameter and thickness can vary slightly between base and higher-output/Prime trims, so measure or order by VIN. All trims in this generation use the motor-on-caliper electronic parking brake, so the scan tool requirement applies to every one of them.
| Wheel lug nuts (M12 x 1.5) | 76 ft-lb (103 Nm) |
| Rear caliper guide-pin (slide) bolts, 14 mm head | approx. 25 ft-lb (34 Nm) — verify in the service manual |
| Rear caliper mounting bracket bolts to knuckle, 17 mm head | approx. 65 ft-lb (88 Nm) — verify in the service manual |
| Brake hose / EPB harness bracket bolt | verify in the service manual |
| Rotor locating screw (if fitted) | verify in the service manual |
The 21 mm lug, 14 mm guide-pin and 17 mm bracket bolt sizes and the EPB service-mode requirement are consistent across XA50 gas and hybrid rear brakes, but confirm your rotor diameter and the exact bracket/guide-pin torque figures against the Toyota service data for your VIN before final tightening.
Not safely or reliably. The parking brake motor holds the piston out, and there is no mechanical release screw. You need a tool that can command Toyota EPB maintenance mode — many mid-range scanners (Autel, Foxwell, Launch, Techstream with a cable) do this.
The two caliper guide-pin (slide) bolts take a 14 mm socket, and the two caliper mounting bracket bolts that hold the bracket to the knuckle take a 17 mm socket. Lug nuts are 21 mm.
Thread two M8 x 1.25 bolts into the threaded jacking holes in the rotor hat and tighten them alternately a half turn at a time. A shot of penetrating oil around the hub center and some taps on the hat with a dead blow hammer will usually pop it loose.
Yes. Regenerative braking does much of the slowing, so hybrid rear pads often last a long time but the calipers and guide pins are more prone to seizing from lack of use. Clean and re-grease the slides and check that the pistons move freely while you're in there.