Boiling fluid?

[SHANE 73Z]

Hey guys,

I am just wondering if anyone has ever seen the fluid in the MC boil from underhood heat. I am having a little trouble with my brakes now that the weather is hot. When first getting into the car cold, the brakes are working fine, but as the temperature (engine/underhood) the pedal gets soft. One pump gets it right back but Id like to get it fixed. Am I correct that the boiling point of brake fluid becomes lower every time it boils?

The MC is an all aluminum dual master/bias bar arrangement from CNC. The car is a 73 Camaro with a stock flat hood (no air gets out). I am open to suggestion. I was thinking a heat shield would be my first idea.

Thanks in advance,
Shane

[wendell]

When people talk about brake fluid boiling they are reffering to the fluid in the calipers. A quality dry brake fluid won't boil till +450 degrees. Those sort of temps aren't attainable in the MC. That said, degraded fluid or fluid that has absorbed water will have a markedly lower boiling point. Still too high to be effected by under hood temps but lowered enough to boil in the calipers under prolonged spirited street driving.

If you're pedal gets soft quickly, it's probably due to air in the system. When you bleed your brakes look at the fluid coming out ofthe calipers. If it's discolored, flush it out and replace with a quility fluid. The sky's the limit price wise when it comes to brake fluid. For street use any premium brand will do. Freshness is more important. Buy little bottles and don't use fluid from a bottle that's already opened. Brake fluid is VERY hydroscopic. Have fun.

[SHANE 73Z]

Wendell,

Thats what I thought as well, just wanted to check. I will be trying new masters soon, so it will get a good bleeding. I need to check & see if I have a caliper (floating style) hanging up. Everything is new except for the front & rear hardlines.

The fluid has taken on a kinda reddish-brown tint. Would this indicate anything???

Thanks again,
Shane