luca2020
Member
Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
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where can i get this stuff from? how much is it?
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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demon tweeks around a tenna
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Kris TD
Member
Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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any motor factors.
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luca2020
Member
Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
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hmmmmm demon tweeks only sell DOT 4 fluid, will it really mater much, difference wise between DOT4 and DOT 5.1?
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Adam-D
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Registered: 11th May 02
Location: Cheshire
User status: Offline
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they do sell dot 5.1 page 65 2003 catalouge
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kev007
Member
Registered: 10th Dec 02
User status: Offline
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wots the point of using dot 5.1? its meant for high performance vehicles (like bmws etc) dot 4 is plenty good enough for corsas
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Corsa^Dan
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Registered: 4th Dec 02
Location: Sleaford, Lincolnshire
User status: Offline
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wots the diff?
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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quote:
Originally posted by kev007
wots the point of using dot 5.1? its meant for high performance vehicles (like bmws etc) dot 4 is plenty good enough for corsas
Its basically got a higher boiling point so that it stays cooler for longer. So it will compress less and perform under harder conditions.
Its not intended for 'performance vehicles (like bmws :lol Its for race cars.
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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If you have an entirely new brake setup fitted like one from hi spec, it is best to use 5.1 fluid since this brings it up to optimum performance under all conditions. For standard brakes, DOT4 is plenty good enough.
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luca2020
Member
Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
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got some 5.1 from halfords, i just bought a v6 kit and bradied hose lines, so may as well use 5.1, cost under a tenner
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kev007
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Registered: 10th Dec 02
User status: Offline
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dot 5.1 IS for higher performance vehicles most standard cars use dot 4 as some one said earlier i just cant see the point of using it if youve only got a corsa still its your money at the end of the day
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big eck
Member
Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
User status: Offline
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quote:
Originally posted by luca2020
got some 5.1 from halfords, i just bought a v6 kit and bradied hose lines, so may as well use 5.1, cost under a tenner
Let me know if the V6 conversion is any good m8 as I definatly need to upgrade my breaks cause the astra 16v ones are gash. 
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AgentBlue
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Registered: 29th Mar 02
Location: Co.Down Northern Ireland
User status: Offline
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Its all to do with the way the car is driven.
Irrespective of the make or model of car.
If you find that your brakes have a tendancy to fade under tougher conditions then a higher spec brake fluid might well be a good idea for safety reasons.
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Adam
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Registered: 1st May 01
Location: Hurstbourne Tarrant
User status: Offline
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no point adding 5.1 unless you put uprated pads on there
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luca2020
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Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
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the kit should be on in about a weeks time, big eck ill let u know mate
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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ive got ebc pads and red dot disks is it worth going to 5.1 fluid
as its gonna be chanenged soon
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and-m
Member
Registered: 5th May 02
Location: Liverpool. Drives. Skud vRS.
User status: Offline
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You shouldve went straight to Astra GTE 16v brakes Adam/thats if you dont have them already.
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luca2020
Member
Registered: 26th May 02
Location: Maidstone, Kent
User status: Offline
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right i got this of migweb after posting the same thread:
DOT3
DOT3 brake fluid is the "conventional" brake fluid used in most vehicles.
Advantages:
DOT3 fluid is inexpensive, and available at most gas stations, department stores, and any auto parts store.
Disadvantages:
DOT3 fluid eats paint!
DOT3 fluid absorbs water very readily. (This is often referred to as being hydroscopic.) As such, once a container of DOT3 has been opened, it should not be stored for periods much longer than a week before use. Since DOT3 fluid absorbs water, any moisture absorbed by the fluid can encourage corrosion in the brake lines and cylinders.
DOT4
DOT4 brake fluid is the brake fluid suggested for use in some late model cars.
Advantages:
DOT4 fluid is available at most auto parts stores, and at some (but not all) gas stations or department stores.
DOT4 fluid does not absorb water as readily as DOT3 fluid.
DOT4 fluid has a higher boiling point than DOT3 fluid, making it more suitable for high performance applications where the brake systems are expected to get hot.
Disadvantages:
DOT4 fluid eats paint! Small leaks around the master cylinder will eventually dissolve away the paint on your bodywork in the general vicinity of the leak, and then give rust a chance to attack the body of your car!
DOT4 fluid is generally about 50% more expensive than DOT3 fluid.
Since DOT4 fluid still absorbs some water, any moisture absorbed by the fluid can encourage corrosion in the brake lines and cylinders.
DOT5
DOT5 brake fluid is also known as "silicone" brake fluid.
Advantages:
DOT5 doesn't eat paint.
DOT5 does not absorb water and may be useful where water absorption is a problem.
DOT5 is compatible with all rubber formulations. (See more on this under disadvantages, below.)
Disadvantages:
DOT5 does NOT mix with DOT3, DOT4 or DOT5.1. Most reported problems with DOT5 are probably due to some degree of mixing with other fluid types. The best way to convert to DOT5 is to totally rebuild the hydraulic system.
Reports of DOT5 causing premature failure of rubber brake parts were more common with early DOT5 formulations. This is thought to be due to improper addition of swelling agents and has been fixed in recent formulations.
Since DOT5 does not absorb water, any moisture in the hydraulic system will "puddle" in one place. This can cause localized corrosion in the hydraulics.
Careful bleeding is required to get all of the air out of the system. Small bubbles can form in the fluid that will form large bubbles over time. It may be necessary to do a series of bleeds.
DOT5 is slightly compressible (giving a very slightly soft pedal), and has a lower boiling point than DOT4.
DOT5 is about twice as expensive as DOT4 fluid. It is also difficult to find, generally only available at selected auto parts stores.
DOT5.1
DOT5.1 is a relatively new brake fluid that is causing no end of confusion amongst mechanics. The DOT could avoid a lot of confusion by giving this new fluid a different designation. The 5.1 designation could lead one to believe that it's a modification of silicone-based DOT 5 brake fluid. Calling it 4.1 or 6 might have been more appropriate since it's a glycol-based fluid like the DOT 3 and 4 types, not silicone-based like DOT 5 fluid.
As far as the basic behavior of 5.1 fluids, they are much like "high performance" DOT4 fluids, rather than traditional DOT5 brake fluids.
Advantages:
DOT5.1 provides superior performance over the other brake fluids discussed here. It has a higher boiling point, either dry or wet, than DOT 3 or 4. In fact, its dry boiling point (about 275 degrees C) is almost as high as racing fluid (about 300 degrees C) and 5.1's wet boiling point (about 175 to 200 degrees C) is naturally much higher than racing's (about 145 C).
DOT5.1 is said to be compatible with all rubber formulations.
Disadvantages:
DOT5.1 fluids (and Spectro's Supreme DOT4) are non-silicone fluids and will absorb water.
DOT5.1 fluids, like DOT3 & DOT4 will eat paint.
DOT 5.1 fluids are difficult to find for sale, typically at very few auto parts stores, mostly limited to "speed shops."
DOT 5.1 will be more expensive than DOT3 or DOT4, and more difficult to find.
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