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When to Replace Brake Pads
Replace brake pads when remaining thickness, the warning sensor, or the workshop measurement says they are due. Mileage alone is not the interval.
When to replace brake pads is a measurement question, not a round kilometer everyone shares. Pads wear with the way you stop, the weight of the car, hills, and whether the last set was a hard or a soft compound. Two cars with the same odometer can be in completely different shape.
The owner's manual, or the pad maker's minimum thickness, is the limit that matters. A workshop measures what is left. A squeal tab or an electrical wear sensor is an alarm that the limit is close. It is not a substitute for looking when the car already feels wrong.
This page is the decision and the record. It is not a brake job you do from a paragraph. If the pedal goes long, the car pulls under braking, or you see a warning light, stop driving it as normal and have the brakes inspected. RPMBase stores the visit after the work is done. It does not measure a pad.
Oil, filters, and a timing belt sit on other schedules. Pads belong on the same car's maintenance log, with their own date, kilometers, and next check, so a brake job does not disappear into a note that only says 'service'.
What actually decides when brake pads are due
Remaining friction material is the fact. Many workshops treat a few millimeters of pad as the point to plan the job, and less than that as the point to do it now. The exact minimum is in the service data for that caliper, not in a blog that has never seen your car. Ask what they measured on each corner.
A wear sensor or a metal tab that starts to sing is designed to speak before the backing plate meets the disc. Once it sings on every stop, you are late, not early. Some cars have no sensor at all. Silence is not proof the pads are thick.
The disc, or rotor, is part of the same visit. A pad replaced against a badly scored or below-minimum disc does not give you a full brake job. The invoice should say whether discs were replaced, machined where that is still allowed, or left alone.
Signs that mean inspect now, not next year
Grinding, a pedal that travels farther than it used to, a pull to one side, or a vibration only when you brake are reasons to book an inspection this week. They can be pads, a seized slider, fluid, or a disc. Guessing which one from the driver's seat is how people log the wrong repair.
A dash brake warning can mean low fluid, a worn sensor, or the parking brake. Read the owner's manual for that lamp before you assume it is pads. Low fluid with worn pads can mean the pads have used up the fluid in the calipers. It can also mean a leak. A leak is not a pad job.
Uneven wear across an axle usually means a slide pin, a piston, or a previous job that was finished on one side only. Replacing one pad and leaving the other is a story you should not write down as 'brakes done'.
Why there is no universal kilometer for brake pads
Highway miles are gentle on pads. City traffic, mountain roads, towing, and a heavy right foot are not. A number you heard for a different car, or for 'most cars', will either waste a good set or leave you on the metal.
The useful habit is a check at the interval your manual or your inspector expects, and a row every time pads or discs are actually replaced. If the shop only looked and said they are fine, that is an inspection note, not a replacement. Do not move a 'next pads' guess unless someone measured.
Front pads often wear faster than rear pads. Log the axle. 'Brakes' without front or rear makes next year's question impossible to answer.
What the invoice and the log should name
Write the date, the odometer, which axle, pads or pads and discs, and the cost. If wear sensors were replaced, say so. If the shop declined to do the other axle, mark that as declined, not as done.
Brake fluid is a different job, on a time interval, even when the pads are new. Fresh pads do not dry out old fluid. Keep that line separate so the next fluid change is not forgotten just because the pedal feels firm today.
Keep the invoice. A buyer, or you in three years, wants to know which axle and whether the discs were included. A searchable row in the car maintenance tracker is the index. The paper is the proof.
How this sits next to the rest of the schedule
Pads are a wear item on the routine car maintenance list, beside oil and tires, not instead of them. A car that is religious about oil and silent about brakes is only half maintained.
Tires change the braking distance too. A thick pad behind a tire that is at the legal limit is still a poor stop. When to replace car tires is the matching decision. The tire log guide is how you write tread and rotations so they do not get mixed into the brake row.
RPMBase will remind you from a date or a kilometer you set after this visit. It will not scrape a pad-life percentage from the car, and it will not tell you the pads are safe because the last row was recent. You set the next check from what the workshop measured.
What not to record as a brake job
A car wash, a noise that went away, or a recommendation you refused is not a replacement. If you refused, write refused. The next reader of the log, including a buyer, should not inherit a fiction.
Bedding-in advice from the shop, if they gave any, can live in the note. It is not a second service. Do not create a second row for the same visit unless a different axle was done on a different day.
Do not copy a pad thickness you did not see. 'They said it was fine' is a sentence. A millimeter you invented is a false measurement. Leave the number blank when you do not have it.