clutch & brake fluid

[WBofTN]

I recently got stuck in slow, stop & go traffic for about a hour.
The car started running hot (230 degrees). This caused my clutch
and brakes to act up.[xx(]
I was told that this can "screw up" the properties of the hydraulic fluid.
My question is: what fluid should I use and how do you replace the fluid in the clutch system??[?]
BTW: I finally found a place to pull over and cool off. No damage
Thank God.:D

'93 Unique 427/351W/4sp

[Silk]

This is what Wilwood recommended to me:

http://www.magnumforceracing.com/store4/wilwood/wilwood_brake_fluid.jpg

Much higher boiling point than whatI was using. To change fluid, I emmpty the master cylinder and then fill/bleed a couple of times.

Gary
Unique FIA 351W

[Silk]

This is what Wilwood recommended to me:

http://www.magnumforceracing.com/store4/wilwood/wilwood_brake_fluid.jpg

Much higher boiling point than whatI was using. To change fluid, I emmpty the master cylinder and then fill/bleed a couple of times.

Gary
Unique FIA 351W

[Brent]

What does Mcleod suggest for the hydraulic throwout bearing? Can I use this same fluid?

Brent

[Brent]

What does Mcleod suggest for the hydraulic throwout bearing? Can I use this same fluid?

Brent

[eliminator]

Brent,

You can, that's what I am using. It is a DOT 3 fluid. I use it in the clutch and Valvoling Synthetic in the brake system. You could use all Dot 3 but it will sure screw up painted surfaces and aluminum finishes. Once I got my cap on the Master Cylinder correctly and with the heat shield under the cylinders I have never had any overheating or boilover from the cylinders. It's probably a good idea to change all the fluids once a year because of moisture build up in the fluids.

Eliminator

[eliminator]

Brent,

You can, that's what I am using. It is a DOT 3 fluid. I use it in the clutch and Valvoling Synthetic in the brake system. You could use all Dot 3 but it will sure screw up painted surfaces and aluminum finishes. Once I got my cap on the Master Cylinder correctly and with the heat shield under the cylinders I have never had any overheating or boilover from the cylinders. It's probably a good idea to change all the fluids once a year because of moisture build up in the fluids.

Eliminator

[WBofTN]

Eliminator:
I believe this is dot 5 fluid (if I read it right).
Do you still think it would be alright to use it in the
clutch??
WB

'93 Unique 427/351W/4sp

[WBofTN]

Eliminator:
I believe this is dot 5 fluid (if I read it right).
Do you still think it would be alright to use it in the
clutch??
WB

'93 Unique 427/351W/4sp

[excelguru]

I used DOT 4 in everything because of the higher boiling point than DOT 3. If I had been aware of a DOT 5, I would've used it instead, although I've not yet had problems with 4.

Keith :)
Unique Motorcars (http://www.uniquecobrareplicas.com)
Southern Automotive (http://www.southernautomotiveengines.com)
Bruce Bunn (the painter) (http://www.jodecoautobody.com)

My Photo Album (http://members5.clubphoto.com/keith355593/owner-429c-1.phtml)

[excelguru]

I used DOT 4 in everything because of the higher boiling point than DOT 3. If I had been aware of a DOT 5, I would've used it instead, although I've not yet had problems with 4.

Keith :)
Unique Motorcars (http://www.uniquecobrareplicas.com)
Southern Automotive (http://www.southernautomotiveengines.com)
Bruce Bunn (the painter) (http://www.jodecoautobody.com)

My Photo Album (http://members5.clubphoto.com/keith355593/owner-429c-1.phtml)

[eliminator]

Wes,

I will check my Wilwood Fluid at home to be sure. Do it today, but what I am using is Dot 3 I think ???

Eliminator

[eliminator]

Wes,

I will check my Wilwood Fluid at home to be sure. Do it today, but what I am using is Dot 3 I think ???

Eliminator

[TurnpikeBoy]

Be advised that Wilwood specifically states that silicone-based brake fluids are NOT RECOMMENDED in their products - NO DOT 5's.

This goes for brake and clutch cylinders. Use their stuff and you will not have troubles; cost difference is negligible.

Yeehah

[TurnpikeBoy]

Be advised that Wilwood specifically states that silicone-based brake fluids are NOT RECOMMENDED in their products - NO DOT 5's.

This goes for brake and clutch cylinders. Use their stuff and you will not have troubles; cost difference is negligible.

Yeehah

[eliminator]

BRAKE FLUID:
Due to the extreme operating temperatures of a high performance brake system, standard “off-the-shelf” brake fluids are not recommended. Of critical importance in determining a fluids ability to handle high temperature applications is the Dry Boiling Point and compressibility.


The Dry Boiling Point is the temperature at which a brake fluid will boil in its virgin non-contaminated state. The highest temperature Dry Boiling Point available in a DOT 3 fluid is 572° F.

The Wet Boiling Point is the temperature a brake fluid will boil after it has been fully saturated with moisture. The DOT 3 requirement for wet boiling point is a minimum temperature of 284° F.

There are many ways for moisture to enter your brake system. Condensation from regular use, washing the vehicle and humidity are the most common, with little hope of prevention. Glycol based DOT 3 & 4 fluids are hygroscopic; they absorb brake system moisture, and over time the boiling point is gradually reduced.

Wilwood does not recommend using DOT 5 fluid in any racing applications. DOT 5 fluid is not hygroscopic, so as moisture enters the system, it is not absorbed by the fluid, and results in beads of moisture moving through the brake line, collecting in the calipers. It is not uncommon to have caliper temperatures exceed 200° F, and at 212° F, this collected moisture will boil causing vapor lock and system failure. Additionally, DOT 5 fluid is highly compressible due to aeration and foaming under normal braking conditions, providing a spongy brake feel. DOT 5 fluid is best suited for show car applications where its anti-corrosion and paint friendly characteristics are important.

Whenever you add fresh fluid to your existing system (never mix fluids of different DOT classifications), it immediately becomes contaminated, lowering the boiling point of the new fluid. For maximum performance, start with the highest Dry Boiling Point available (try Wilwood’s Hi-Temp° 570 Racing Brake Fluid), flush the system completely, and flush it regularly, especially after severe temperatures have been experienced.











Eliminator

[eliminator]

BRAKE FLUID:
Due to the extreme operating temperatures of a high performance brake system, standard “off-the-shelf” brake fluids are not recommended. Of critical importance in determining a fluids ability to handle high temperature applications is the Dry Boiling Point and compressibility.


The Dry Boiling Point is the temperature at which a brake fluid will boil in its virgin non-contaminated state. The highest temperature Dry Boiling Point available in a DOT 3 fluid is 572° F.

The Wet Boiling Point is the temperature a brake fluid will boil after it has been fully saturated with moisture. The DOT 3 requirement for wet boiling point is a minimum temperature of 284° F.

There are many ways for moisture to enter your brake system. Condensation from regular use, washing the vehicle and humidity are the most common, with little hope of prevention. Glycol based DOT 3 & 4 fluids are hygroscopic; they absorb brake system moisture, and over time the boiling point is gradually reduced.

Wilwood does not recommend using DOT 5 fluid in any racing applications. DOT 5 fluid is not hygroscopic, so as moisture enters the system, it is not absorbed by the fluid, and results in beads of moisture moving through the brake line, collecting in the calipers. It is not uncommon to have caliper temperatures exceed 200° F, and at 212° F, this collected moisture will boil causing vapor lock and system failure. Additionally, DOT 5 fluid is highly compressible due to aeration and foaming under normal braking conditions, providing a spongy brake feel. DOT 5 fluid is best suited for show car applications where its anti-corrosion and paint friendly characteristics are important.

Whenever you add fresh fluid to your existing system (never mix fluids of different DOT classifications), it immediately becomes contaminated, lowering the boiling point of the new fluid. For maximum performance, start with the highest Dry Boiling Point available (try Wilwood’s Hi-Temp° 570 Racing Brake Fluid), flush the system completely, and flush it regularly, especially after severe temperatures have been experienced.











Eliminator

[WBofTN]

Thank eliminator:
good info - sounds like we should replace the fluid on a regular
basis. With resivors placed close to the header - there is lots
of heat.
WB

'93 Unique 427/351W/4sp

[WBofTN]

Thank eliminator:
good info - sounds like we should replace the fluid on a regular
basis. With resivors placed close to the header - there is lots
of heat.
WB

'93 Unique 427/351W/4sp

[eliminator]

I did check my container of Wilwood 570 today and it's definetly DOT 3. It's worked great for me.



Eliminator

[eliminator]

I did check my container of Wilwood 570 today and it's definetly DOT 3. It's worked great for me.



Eliminator