Asentado de pastillas: el procedimiento de 30 minutos
A large share of brake pad complaints — weak bite, squeal, pulsing — trace back to one skipped step: bedding in. Pads do not reach their designed friction on day one. Here is what is happening and how to do it right.
What bedding actually does
Braking friction comes largely from a microscopic transfer layer of pad material deposited evenly on the disc surface. Fresh pad on bare steel has patchy, inconsistent contact; the material must heat moderately and deposit evenly. Until that layer forms, bite is weak, modulation is poor and noise is common. The layer also explains the classic symptom: brakes that feel excellent for two hard stops, then fade and squeal — the first stops wiped the patchy deposits off and nothing replaced them evenly.
The procedure
- Find a quiet, safe stretch of road. Ride at moderate speed and brake firmly (not a panic stop — about 70–80% of maximum) from, say, 50 km/h to 10 km/h. Do not come to a complete stop.
- Repeat 8–10 times without letting the brakes cool fully. You are building controlled heat.
- Ride for several minutes at speed without touching the brakes to cool them evenly. Coming to a halt with hot rotors imprintes the pad pattern and can create thickness variation — the root of future pulsing.
- Repeat the whole cycle once more. Total time: about 30 minutes.
- Expect smell, maybe light smoke, and temporarily reduced bite mid-procedure. All normal. Persistent smoke or a pedal that stays soft after cooling is not — inspect.
Recognizing a glazed pad
If the customer ignored break-in, the pad surface polishes to a glassy sheen with blued heat spots. Friction drops, squeal appears, and the pad looks "like new" — because glaze is exactly what happens when a pad that should be wearing does not. Light glazing can be scuffed off with abrasive cloth in a flat pattern; heavy glazing with heat cracks means replacement. Glazing is a warranty reject only if the customer was told to bed them in — so put the procedure card in the box.
For distributors
A one-page bed-in card inside every pad box costs almost nothing and prevents the single most common false warranty claim in the category. We print them in six languages for our partners; ask for them with your next pad order. A customer who beds pads properly gets the friction the compound was designed for — and reorders the same SKU.