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  #1  
Old 07-11-2008, 04:02 AM
CoyoteStarfish's Avatar
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Join Date: Jun 2008
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Glowing brake rotors, take 2. ACTION.

This one throws me off a bit.

A few months ago, I was zooming down the interstate having a great time. Music blasting, sunroof back. Ahh, great night for a car ride.

I smell something funny, and notice my power is dropping rapidly (floored was only giving me 40MPH by the time I was able to pull into the emergency lane.)

Pull off, smoke billowing from the rear passenger tire well. The rotor was RED HOT. Obviously, cooked my seals and brake pads. Obtained new seals and replaced the faulty seal and the pads and went on like nothing happened.

Two days ago, same thing happens. This time on the driver side, the side I neglected to rebuild.

Both times, after the brakes cooled I could drive them like normal again. I just did not trust it afterwords and promptly proceeded with a rebuild.


What caused this failure? Can it happen to the front rotors?

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  #2  
Old 07-11-2008, 04:05 AM
ForcedInduction
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Faulty master cylinder not releasing fluid back, a rusted caliper or any number of things I can't think of right now. When was the last time you flushed the brakes?
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  #3  
Old 07-11-2008, 05:12 AM
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Quote:
Originally Posted by ForcedInduction View Post
Faulty master cylinder not releasing fluid back, a rusted caliper or any number of things I can't think of right now. When was the last time you flushed the brakes?
Old brake lines breaking off small rubber partials and going into the caliper?
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  #4  
Old 07-11-2008, 05:16 AM
CoyoteStarfish's Avatar
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Last flush? Never. Probably hasn't been flushed since 1983. Definitely not since I owned it. How often should a flush be performed?

It's on my to-do list now. Up there with leaky oil cooler lines and new CV shafts. Moneypit. But I love her so.

While we are on the subject, what brake fluid is recommended for this vehicle?
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Gone but not forgotten:
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1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel
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  #5  
Old 07-11-2008, 05:46 AM
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You are supposed to flush the system every two years. I would also replace all the rubber brake lines. They will tend to swell up on the inside allowing the break pressure to slowly dissipate, this can lead to a sticking caliper. use a dot 4 break fluid like the valvoline synpower.
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  #6  
Old 07-11-2008, 05:58 AM
KarTek's Avatar
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I second the flush idea. It happened on my Corvette once. Over the years, if the system isn't flushed, moisture can build up and foul the components. You might also suddenly find yourself with no brakes after some "spirited" driving when the water laden brake fluid boils in the calipers.
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  #7  
Old 07-11-2008, 07:50 AM
Cervan's Avatar
Crazy mechanic.
 
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Quote:
Originally Posted by CoyoteStarfish View Post
Last flush? Never. Probably hasn't been flushed since 1983. Definitely not since I owned it. How often should a flush be performed?

It's on my to-do list now. Up there with leaky oil cooler lines and new CV shafts. Moneypit. But I love her so.

While we are on the subject, what brake fluid is recommended for this vehicle?
use dot 3 brake fluid, i get it in bulk from walmart for cheap. if you have a 4speed, bleed the clutch too, it will feel alot better. The reason you flush is to get rid of the moisture in the brake fluid, because its hygroscopic (attracts water) What happens is after a few years, it becomes diluted with water, well water boils at a lower point than brake fluid, when fluid boils you get a gas. And gas compresses, so you loose your brake pedal because your compressing the gas now being created (steam) in the brake lines from the hot calipers. It also helps keep the system clean, water creates rust and corrosion wich will block and lock up brake cylinders and calipers.
__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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  #8  
Old 07-11-2008, 08:51 AM
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dot 3 should be fine, but why? to save $1? the cap on the MC says Dot 4, synpower is cheap in the quart bottles, put in dot 4.
I mean really, we drive awesome 4wheel dual piston calipered brakes. use the right fluid!
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  #9  
Old 07-11-2008, 10:02 AM
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If it says DOT4 on the cap, use it, there's a reason the manufacturer calls for it. Mixing fluids or using the wrong fluid can damage things. On my father's Goldwing, he used dot3 in place of 4 once doing a maintenance flush, not realizing it called for the latter. It resulted in a galling/seizing effect in the controls, as there was something in the dot3 that reacted with one of the internal components.

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