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synthetic brake fluid
I replaced by brake pads on my '84 NA with some Mintex pads from Pelican and I thought it would be a good time to flush and bleed the entire brake system. I went down to the local FLAPS and purchased some Prestone Synthetic brake fluid (glycol based DOT 3), but I am having 2nd thoughts about using it in a 23 year-old Porsche. I'm wondering if the seals in my brake system and clutch system are compatible with these new brake fluids. Does anyone out there have any experience with synthetic brake fluids? If there is any chance of a problem I would rather not take a chance in damaging my seals.....I can always put the synthetic stuff in the wife's Camry.
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02-21-2007, 05:31 PM
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Coming up on your left...
Join Date: Nov 2006
Location: Albany, NY, USA
Posts: 695
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I could be wrong, but I don't think it matters as long as it's a DOT 3 or 4 fluid. If your seals are bad, they would be bad with anykind of DOT 3 or 4 fluid I reckon.
What you don't want to use is something like DOT 5 or 5.1. Somebody correct me if I'm wrong.
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1986 Porsche 944 Turbo "S" clone  1998 Honda Accord  Siena College '08 Manager, Mavis Discount Tire 
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02-21-2007, 06:05 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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I think Dot5 is totally different. It's some kind of silicone-based fluid, or something like that.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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02-21-2007, 07:04 PM
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DOT 3 and 4 fluid formulations are completely compatible with each other, the differences are in the boiling points.
DOT 5 is silicone based, and not at all compatible with a DOT 3 or DOT 4 system. I am not sure on DOT 5.1, it may be compatible, check the bottle. I have seen a system designed for one fluid (DOT5) in which the wrong fluid (DOT 3) dissolved the seals. |
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02-22-2007, 01:51 AM
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meister member
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I have used the valvoline synthetic DOT 4 in my 944 for for the past 8 years without problems and I use my brakes hard!!!
Speedy
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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02-22-2007, 05:57 AM
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Coming up on your left...
Join Date: Nov 2006
Location: Albany, NY, USA
Posts: 695
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I've used the Valvoline stuff, too, in my Preludes. Seemed to work well...
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1986 Porsche 944 Turbo "S" clone 1998 Honda Accord Siena College '08 Manager, Mavis Discount Tire
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02-22-2007, 07:28 AM
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I'm rebuilding the calipers anyway, so I think I will give it a try. Thanks for the input.
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02-22-2007, 04:13 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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ATE DOT 4 blue. (ATE as A T E, i didn't eat the stuff)
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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02-22-2007, 05:54 PM
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Redline Racer
Join Date: Jan 2007
Posts: 2,444
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Quote:
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
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02-22-2007, 05:59 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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and it looks so purty!
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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02-23-2007, 06:53 AM
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Registered
Join Date: Oct 2002
Location: near Nashville, TN
Posts: 227
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To the best of my knowledge brake fluid does not exist naturally, it's all synthetic.
DOT 3, 4 and 5.1 are compatible DOT 5 is not compatible with the others. Harley Davidson uses DOT 5, there must be others but I don't know of them.
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Bill W. '97 Arena Red / Gray 993 Cab '93 968 Coupe 6 Spd '88 911 Cab Red/Blk (sold) |
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02-23-2007, 11:14 AM
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