2003 Honda Civic EX
While braking continuously on a long shallow incline, the brakes will suddenly grip harder in a predictable way, jerking me forward a little and braking harder from then on. Like it switches from one deceleration rate to another. Is this the transmission switching to engine braking? The brake pump turning on? I don't think it has anything to do with the pads or rotors themselves.
Update: I watched the tachometer this time and it jumps up in RPM when the braking gets harder, so it's the gear shifting. Is it supposed to affect the brakes suddenly like this?