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2Addicts | BMW 2-Series forum Technical Topics Mechanical Maintenance and TSBs: Break-in | Oil & Fluids | Servicing | TSB brake trouble after track day

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      06-05-2019, 06:40 PM   #1
vancitymike
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brake trouble after track day

So when I was checking my tire pressures after my first track run, I was down near the tire when I heard a hissing sound - it sounded like the brake fluid was boiling out of my caliper. The boiling stopped soon after, my brake fluid level wasn't going down, and the brakes seemed to be fine for the rest of the track day, nor did the sound come back. Later I took the wheel off and noticed what looked like brake fluid stains (very hard to get out) and I've now noticed, even though I've bled the brakes, the brake under suspicion doesn't seem to produce nearly as much brake dust as the other side.... for starters I'm going to clean the pad and caliper with proper cleaner - any other suggestions? Anyone had their brakes boil? I've heard of it but don't actually know what it entails... thanks
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      06-07-2019, 12:08 PM   #2
kthor703
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My first thought is a loose bleeder screw on the caliper. But if you have ruled that out, maybe it's a piston seal that is failing.
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      06-10-2019, 11:10 AM   #3
vancitymike
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Quote:
Originally Posted by kthor703 View Post
My first thought is a loose bleeder screw on the caliper. But if you have ruled that out, maybe it's a piston seal that is failing.
I hope it was just a loose bleeder screw - to be double sure, I re-bled that brake and cleaned up the area with some brake parts cleaner, I think it seems better - but if I notice any imbalance or if it's still not creating as much brake dust as the other side, It could be a trip to see the professionals....
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      06-13-2019, 06:37 PM   #4
Maynard
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Did you have stock fluid, or a hi-temp one? If you boiled track fluid, that would likely be hot enough to risk damaging seals, perhaps even distorting the factory rubber brake lines. Either way it needs a full flush, not just a bleeding.
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      06-16-2019, 11:14 AM   #5
MarcoZandrini
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Try Motul RBF600 brake fluid.
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