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Which Brake Fluid?
#190415
01/11/09 10:40 AM
01/11/09 10:40 AM
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Joined: Jun 2005
Posts: 1,534
Florida
CHRGR69
OP
pro stock
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OP
pro stock
Joined: Jun 2005
Posts: 1,534
Florida
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COMPLETELY new drum brake system on my 71 Cuda. From the lines to the wheel cylinders. Not sure which fluid to use. The DOT 5 silicone is great for not damaging the paint, but they say it will always have a spongy pedal feel. DOT 3, 4 and 5.1 give a harder pedal feel, but can damage the paint. What are you guys using and experiencing?
Grandma always said I had "hands of gold"!
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Re: Which Brake Fluid?
[Re: CHRGR69]
#190419
01/11/09 01:09 PM
01/11/09 01:09 PM
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Joined: Apr 2008
Posts: 1,195
Snowing in the north!
Dart 340
moparts member
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moparts member
Joined: Apr 2008
Posts: 1,195
Snowing in the north!
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Quote:
COMPLETELY new drum brake system on my 71 Cuda. From the lines to the wheel cylinders. Not sure which fluid to use. The DOT 5 silicone is great for not damaging the paint, but they say it will always have a spongy pedal feel. DOT 3, 4 and 5.1 give a harder pedal feel, but can damage the paint. What are you guys using and experiencing?
There was a fantastic article published by the SAE
about a year ago on studies of silicone vs dot 3 or 4 fluids. I will see if I can find it, but the short version was silicone was not recommended for
long term use. Now before a bunch of you start crying about how you have used it for years, as I
have also, there is fact behind it. If you totally
purge your system (change the silicone fluid) I believe it was on a 2 or 3 year schedule it is
fine, otherwise the silicone would develop moisture droplets in the fluid as it doesn't absorb moisture like dot 4. Anyway, I am sure I
have the article somewhere in my engineering docs.
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Re: Which Brake Fluid?
[Re: DAYCLONA]
#190422
01/11/09 06:37 PM
01/11/09 06:37 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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4 wheel drum is a pretty primative system. Not likely to see any benefit from a superior fluid like dot 4 or 5  I would just run dot 3 in it, if it was me. Modern dot 3 more than meets any spec an old 4 wheel drum system ever had.
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I think either is fine but I would use dot 5 if the paint contact is an issue. I think changing/flushing the fluid out is important in the long run & generally not done/overlooked & the same with PS fluid.
