After fitting new pads and replacing the brake fluid the front brakes are still spongy! I thought by doing this work it would have fixed this problem I've always had with this bike! I've ridden my friends 848 evo and the front brakes on that seem much my responsive. I have checked the callipers/pistons, everything's working fine, my friend and I have checked and double checked there's no air in the system! any clues?????
Is it worth stripping the calipers and giving them a good clean? No expert on this but are the pistons moving freely? Any leaks anywhere that could be drawing air into the system? Just trying to think of other things you could do. someone with far superior knowledge than me should be along shortly. matt
how worn or old are your discs because they will be a different shape to the face of the new pad therefor the contact patch will be small and not very solid
the bike is a 2007, disc look okay to me but the brake were "spongy" when I first bought the bike (june 2012) the pads i removed were not that worn compared to the new ones and they were genuine Brembo!
you can sometimes get an internal leak within the master cylinder so fluid is passing the piston seal ......
First port of call is defo a good clean of the pistons etc,makes a huge difference,last time I did it for the same reasons as you,after cleaning went down the road to test,and very nearly did a total over the bars stoppie,that's the difference it should make,and cheap to do too,just need 2 or 3 cans of brake fluid,brake cleaner of paraffin,a toothbrush and bleeding equipment.
also your new pads need run in. you can also clean your disks...a little light emery and then some brake cleaner.
I'd defo give the new pads time to bed in. Try also tying the brake lever up over night. Run a zip tie around the bar and lever and tighten to put the system under pressure. This can help move any rogue air bubbles up to the top of the system and bled out of the master cylinder.
