Hope someone can help, was driving to work this morning straight stretch of road 50/60MPH when car started to make strange noises - louder engine noise, sort of bumping noise from engine, less power and smell of burning. No dashboard lights on, engine temp fine. Pulled over checked no smoke from engine, checked tyres fine, pumped brakes and pulled out again no problems for rest of trip. I have a feeling it may be brake related, that the brakes are sticking or something but I have really no idea. Anyone know what could be wrong. Nissan Almera 04 62,000 miles due a service.