hi bought car in march! on start of engine red brake warning light comes on and bleaps ! this happened from the day after i bought it then the yellow pad warning light would come on straight after so as we all know when your pad warning light comes on you do another 15000 miles on the old pads cause theres loads of meat left on em! well i do! so i changed all 4 disks and pads last weekend the yellow light has gone off but the red light still comes on! on start up for about 5 secs is this normal! help pls!!