boosterjm 
Amazon has 12oz Castrol 12509 DOT 4 Brake Fluid on sale for $1.81 when you checkout via Subscribe & Save. Shipping is free.
- Unique formula engineered to provide outstanding performance in todays high temperature braking systems
- Provides optimum braking response
- Exceeds DOT3 and DOT4 specifications
- Mixes with other conventional brake fluids
- For case order 12
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