Dahlinboysracing: car and brake info (Page 2 of 2)

Guildenstern wrote:

Wait....Everyone isn't flushing their brake system before every race? o_O

Good Race fluid does not necessarily need it.

One more post, about boiling fluid and why it's so scary. Boiling fluid doesn't come on like fading pads. Brake fade you can feel happen somewhat progressively. Fluid boiling is more like an on off switch. As the fluid heats up it will keep working more or less the same. And it won't boil mid braking point usually because of what happens when you pressurize a fluid. Boiling point increases as you pressurize a fluid. Same reason that water boils at a lower temp in the mountains because atmospheric pressure is lower. So under braking you pressurize the fluid, raise it's boil point, and if you have something weird going on with the brakes you can then push the fluid past the un-pressurized boiling temp while braking. Then when you release the pedal the pressure is reduced and the fluid, now over it's boiling temp, well boils and introduces bubbles. So next time you step on the pedal it's suddenly very soft, or basically nonexistent.

I can't say with 100% certainty that this is what happened to your car, because well I've never closely looked at the system or driven it. But the signs do point that way.

VKZ24 wrote:

TheEngineer wrote:

Good Race fluid does not necessarily need it.

I guess we'll never know, because we've changed our every race for the past 10 years.  ATE 200 is only $20, divided by 4 drivers is $5 each.  When we decided we can't afford that, we'll quit racing.

Of course we've also changed the oil and filter too for every race for the past 10 year too, so we're OK with overkill.

We swap all fluids every race. Oil, trans, diff, brakes, and of course coolant, and give the Power steering a sniff test. One Endurance race weekend is equivalent to a whole season of Club 15-20 lap races.

And on return the race oil gets dumped for cheap store brand, filter cut, and antifreeze put back in. It costs like A tire for that each event.

The Hair is where it becomes a huge Pain.

VKZ24 wrote:

TheEngineer wrote:

Good Race fluid does not necessarily need it.

I guess we'll never know, because we've changed our every race for the past 10 years.  ATE 200 is only $20, divided by 4 drivers is $5 each.  When we decided we can't afford that, we'll quit racing.

Of course we've also changed the oil and filter too for every race for the past 10 year too, so we're OK with overkill.

We swap all fluids every race. Oil, trans, diff, brakes, and of course coolant, and give the Power steering a sniff test. One Endurance race weekend is equivalent to a whole season of Club 15-20 lap races.

And on return the race oil gets dumped for cheap store brand, filter cut, and antifreeze put back in. It costs like A tire for that each event.

You change trans/diff oil every race?  In 25+ races, weve done it maybe once or twice.  Did it last weekend because we changed axle seals.