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KOSTGard® Brake Fluid
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KOSTGard DOT 3 Brake Fluid Product # 4301spacer
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A high quality hydraulic brake fluid designed for disc and drum brake applications. KOSTGard DOT 3 Brake Fluid is compatible with all DOT 3 brake fluids and conforms to federal motor vehicle safety standard NO. 116, SAE specification J1703 and ISO 4925.
   
Typical Properties: Specifications: Typical:
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Pound Per Gallon 8.5 - 8.8 8.55
Dry erbp, deg. F Min. 401 F 460
Wet erbp, deg. F Min. 284 F 288-292
Viscosity @ -40 deg. F Max. 1500 cSt 1400 - 1450
Specific Gravity 1.01 - 1.04 1.02
Corrosion Pass FMVSS 116 Pass
Rubber swell Pass FMVSS 116 Pass
Ph @ 50% Aqueous-Ethanol 7.0 - 11.5 10.5
Appearance Clear Clear
Color Light Amber Light Amber
Evaporation/weight loss 60% Max 40 – 55%
 
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KOSTGard DOT 4 Brake Fluid Product # 4302spacer
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A high quality hydraulic brake fluid designed for disc and drum brake applications. KOSTGard DOT 4 Brake Fluid is compatible with all DOT 4 brake fluids and conforms to federal motor vehicle safety standard NO. 116, SAE Specification J1704, and ISO 4925.
   
Typical Properties:    
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Pound per gallon 8.88  
Erbp, deg. F 475  
Wet erbp, deg. F 325  
Viscosity @ -40 deg. F 1200  
Evaporation, 3 days Less than 50%  
Evaporation, 7 days Less than 75%  
Rubber swell @ 158 deg. F 0.035”  
Rubber swell @ 248 deg. F. 0.037”  
Ph @ 50% Aqueous-Ethanol 9.0  
 
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KOSTGard DOT 5 Brake Fluid Product # 4303spacer
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A silicone brake fluid that conforms to federal motor vehicle safety standard NO. 116 for DOT 5 motor vehicle brake fluid. Compatible with all DOT 5 brake fluids.
   
Typical properties: Requirements Typical
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Erbp Min. 500 deg f > 500 deg f
Wet erbp, deg. F Min. 356 deg f > 500 deg f
Viscosity @ -40 deg. F Max 900 cst 280 cst
Viscosity @ 212 deg. F Min 1.5 cst 13.3 cst
Evaporation, 3 days < 60% after 3 days 1.7 %
Evaporation, 7 days Max. 80% after 7 days 1.7%
Rubber swell @ 158 deg. F 0.006” to 0.055” 0.026
Rubber swell @ 248 deg. F. 0.006” to 0.055” 0.013”