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Clutch?

Started by Tapartacus, August 16, 2020, 03:12:17 PM

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red

Quote from: Old Rider on August 21, 2020, 10:38:46 AMI replace brakefluid every 2 years and the reason is i have lost brakes 2 times
Here in Norway 2 years ago there was a horrific accident killing 5 persons driving a Cadillac Coupe de Ville from 1959.They was driving down a steep curvy downhill
montainroad and then crashed right into a mountain wall in a curve at high speed. The investigation concluded it was brake fading because of bad maintenance.
Old Rider,

We had something similar happen here (ending when the minivan went over a cliff, stopping upside down just short of the severe drop-off.  Everybody was badly shaken, but okay).  The driver had started the engine when cold, at the top of the hill.  The automatic choke includes a fast-idle setting when cold, which does not release until the engine is warm and accelerator pedal is pressed lightly.  Going downhill with the fast-idle setting, the driver did not realize the cause, and certainly never touched the accelerator pedal.  The engine over-ran the brakes in a very short time, and only some good luck save the people inside.  We figured out the real cause when the driver complained later that the engine just kept racing, no matter how much brake was applied.
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Cheers,
Red

P.S. Life is too short, and health is too valuable, to ride on cheap parade-duty tires.

Old Rider

Quote from: red on August 22, 2020, 10:32:22 AM
Quote from: Old Rider on August 21, 2020, 10:38:46 AM
Red wrote:

We had something similar happen here (ending when the minivan went over a cliff, stopping upside down just short of the severe drop-off.  Everybody was badly shaken, but okay).  The driver had started the engine when cold, at the top of the hill.  The automatic choke includes a fast-idle setting when cold, which does not release until the engine is warm and accelerator pedal is pressed lightly.  Going downhill with the fast-idle setting, the driver did not realize the cause, and certainly never touched the accelerator pedal.  The engine over-ran the brakes in a very short time, and only some good luck save the people inside.  We figured out the real cause when the driver complained later that the engine just kept racing, no matter how much brake was applied.
.
Red
That sounded like a fun trip (popcorn)

Cheers Rolf

Old Rider

Quote from: ribbert on August 22, 2020, 07:08:04 AM
Quote from: Ribbert=topic=19540.msg199367#msg199367 date=1598024326




A behemoth like a '59 Cadillac with drum brakes on a long continuous, winding descent is a "perfect storm" for brake fade. The hand brake on old cars was commonly called the "emergency brake" for good reason and was usually independent of the main brakes, also for good reason.

Many of the older guys here will remember when learning to drive, being taught the technique for braking down long descents or when towing or from high speed to avoid fade. They probably also remember scaring themselves half to death by ignoring that advice.
This happens with discs but nowhere near to the extent or ease it does with drums. But, as mentioned yesterday, car brakes get much hotter and drum brakes are another whole subject again.


The most common cause of brake fade is a loss of friction between the pad and the rotor, not from overheating the fluid.

Noel

Noel
I did not know that car had drumbrakes that would definitely be a extra bad factor on that heavy beast

Cheers Rolf