KOSTGard® / Brake Fluid 

 

KOSTGard DOT 3 Brake Fluid

Product # 4301

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:
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%

KOSTGard DOT 4 Brake Fluid

Product # 4302

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:
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

KOSTGard DOT 5 Brake Fluid

Product # 4303

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
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”