Acura RSX Brake Pad and Rotor Replacement (2002-2005)
Introduction
This guide walks through a full brake service, pads and optional rotors, on the 2002-2003 Acura RSX, with notes for the 2004-2005 cars where the details differ slightly. Replacing worn pads restores stopping power, while swapping rotors cures pulsing or a scored braking surface. The job is well within reach of a home mechanic with basic hand tools and a safe way to lift the car, and it is straightforward once you have seen how the front and rear calipers come apart, particularly the rear piston, which must be wound in rather than simply pressed. Read through every step before starting so you understand where the front and rear procedures diverge. Adapted from a community writeup by MugsyTheGr8 on Club RSX (https://www.clubrsx.com/threads/diy-brake-pad-and-rotor-replacement.707207/), including corrections from the follow-up discussion.
Reference
Tools Required
- Floor jack
- Two to four jack stands
- 1/2-inch drive ratchet or breaker bar with 19mm socket
- 1/2-inch drive torque wrench
- 1/2-inch drive 3-inch extension
- 3/8-inch drive ratchet
- 3/8-inch drive sockets: 17mm, 14mm, 12mm, and 10mm
- 3/8-inch drive 2-inch extension
- Large flat-blade screwdriver or pry bar
- Rubber mallet
- Rotor puller (needed on 2004-2005 cars)
Parts Required
-
Front brake pad set (for example, EBC Greenstuff)
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Rear brake pad set
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Front rotors (optional, only if replacing the discs)
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Rear rotors (optional; RSX Type-S OEM discs are a common choice)
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Brake fluid (for topping up)
Safety Warnings
- ⚠ Support the car on jack stands rated for its weight before going underneath; never trust the jack alone.
- ⚠ Before driving, pump the brake pedal firmly several times until it feels hard. The pistons were retracted and the pads must re-seat, or your first stop will have almost no braking.
- ⚠ Brake fluid strips paint. Wipe up spills at once and keep it off body panels.
Step-by-Step Instructions
1 Loosen the lug nuts and open the fluid reservoir
With the vehicle still on the ground, use a 1/2-inch drive 19mm socket to crack each lug nut loose about a quarter turn; the weight on the tyres keeps the wheels from spinning. Loosen all four wheels if you intend to lift the whole car, or only the side you will service if you have just two jack stands. Then remove the cap from the brake fluid reservoir so displaced fluid can vent while the pistons are retracted.
2 Raise and support the car
Position the jack and lift the RSX, then set it down onto jack stands. Two stands support one side at a time; four let you raise the entire car and do both sides in a single setup. Never work under a car resting on the jack alone. Release the parking brake before you touch the rear brakes, because an engaged rear caliper cannot be disassembled.
3 Remove the wheels
Fully unthread the already-loosened lug nuts with the 19mm socket and lift the wheels off. Work one corner or side at a time so an untouched reference corner is always available on the opposite side of the car.
4 Open the front caliper to expose the pads
Switch to the 3/8-inch drive tools. Remove the lower caliper slide (guide) bolt with a 12mm socket and pivot the caliper upward on the remaining bolt, which uncovers the piston and both pads. Slide the old pads out and check them for remaining friction material and even wear.
5 Retract the front piston
Fit a 10mm socket and extension onto the caliper bleeder screw and crack it open only slightly so a little fluid can seep out. With the bleeder open, drive the piston straight back into its bore using a pry bar or wide flat-blade screwdriver; expect to push hard. Bleeding while you compress sends the old fluid out of the bleeder instead of forcing it back up through the ABS. Close the bleeder screw as soon as the piston is fully seated.
6 Replace the front rotor (only if fitting new discs)
To change the disc, remove the two large 17mm caliper bracket bolts and hang the caliper from the suspension with wire so its hose carries no load. Back out the small retaining screw(s) set into the rotor face; a 2002-2003 disc uses two, and a seized screw can be freed with heat. Tap the rotor's hat, the central section the wheel seats against, with a rubber mallet to break it loose. Fit the new rotor and reinstall the two 17mm bolts.
7 Fit the front pads and close up
Seat the new pads against the rotor, lower the caliper back over them, and reinstall the 12mm slide bolt you removed earlier. Confirm the bleeder screw is shut and every bolt is torqued before moving to the next wheel.
8 Free the rear caliper and wind its piston in
At the rear, remove both 12mm caliper slide bolts. If the caliper will not swing clear, also unbolt the 12mm brake-line bracket to gain extra slack. The rear piston has an "X" on its face and must be turned inward rather than pressed: crack the 10mm bleeder open, then use a pry bar or screwdriver to rotate the piston back into the caliper body, and close the bleeder. Remove the old pads.
9 Replace the rear rotor (only if fitting new discs)
Undo the two large 14mm caliper bracket bolts and support the caliper off to the side. Remove the rotor's retaining screw(s) and mallet the hat to release the disc. On 2004-2005 cars a lip near the end of the axle can trap the rotor; a rotor puller draws it off cleanly, whereas hammering a new disc into place can distort it slightly and produce a shake under braking at higher speeds. Fit the replacement rotor and reinstall the 14mm bolts.
10 Index the rear inboard pad correctly
The two rear pads are not interchangeable: one backing plate carries a notch and the other does not. The notched pad is the inboard pad that bears against the piston, and its notch must drop into one of the slots on the piston face, or the pad will wear unevenly. If the slots do not line up, turn the piston slightly with a screwdriver until the notch seats. Install both pads and reinstall the 12mm slide bolts.
11 Repeat, remount the wheels, and finish
Work through the same sequence on the remaining corner or side. Refit each wheel and torque the lug nuts to specification with the 1/2-inch drive torque wrench, tightening in a crossing pattern. Top up the brake fluid reservoir to its mark and refit the cap.
Pro Tips
- 💡 Lifting the whole car on four jack stands lets you service both sides in a single setup and noticeably speeds up the job.
- 💡 Once you have done it once, a straight pad swap takes about an hour; add time when you are also changing rotors.
- 💡 The 2002-2003 and 2004-2005 procedures are nearly identical; the 04-05 uses a single rotor retaining screw and is more likely to need a rotor puller.
- 💡 Brake pads are sold in axle sets, so a complete four-wheel job needs two sets, one front and one rear.
- 💡 EBC Greenstuff is a popular pad upgrade that fits both the front and rear.
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