Post
by brillomaster » Tue Apr 24, 2018 1:10 pm
just to update this, just got back from a trackday at Snetterton at the weekend. Car was running relatively well - played some warning light bingo, went into 5 cylinder mode at 1 point which necessitated a key off and key on down the back straight, but generally ok.
however, did get massive brake fade in the afternoon, which was somewhat frustrating... first the pedal was firm, but reduced braking ability - fair enough, pads were getting hot. but then, do a cooldown lap, but then upon coming into the pits, all the heat transferred to the fluid, and the pedal went straight to the floor, despite there being fresh fluid put in just a week before.
Never once had fluid boil on any old 3 series track cars, but then realised that the standard z4 3.0i has zero brake ducting to the front brakes, which I thought very odd! So next steps will be new pads all round (going to try ferodo DS2500), fresh fluid (Motul RBF660, no skimping this time) and also going to remove the front fogs and the access panel, to allow a route for air to get into the front wheel well and hopefully cool the brakes. May also remove the dust shields as well, seems strange to almost completely close off the rear face of the disc to any airflow.
Next trackday is Oulton park in July so potential for another hot day - though I don't think oulton is as hard on the brakes as snetterton.
