The 2020 Ram 3500 uses DOT 4 brake fluid.
In practical terms, the owner’s manual specifies glycol-based DOT 4 brake fluid that meets FMVSS 116 and SAE J1704 standards. It’s important not to use silicone-based DOT 5 and to avoid mixing fluids of different types in the system. If you’re unsure, consult the manual or your Ram dealer.
Brake fluid specifications and compatibility
Here’s what to know when selecting brake fluid for the Ram 3500's braking system.
- Fluid type: DOT 4 brake fluid that meets FMVSS 116 and SAE J1704; glycol-based formulation suitable for ABS and hydraulic brakes.
- Do not use silicone-based DOT 5 brake fluid in most modern Ram braking systems, as it can cause seal damage and fluid incompatibility.
- For routine maintenance, ensure the fluid is fresh and within its service life; avoid reusing old fluid and replace it when moisture content rises or the system is opened during service.
- When flushing or topping up, use the same DOT rating throughout the system and fully bleed when changing fluids to prevent mixing incompatible types.
Bottom line: Use DOT 4 glycol-based brake fluid that meets the standard FMVSS 116, and avoid DOT 5 silicone-based fluid. If you need to replace, confirm the specification in the owner's manual or with a Ram dealer.
Maintenance tips for brake fluid on the Ram 3500
Keeping brake fluid in good condition helps maintain braking performance, especially under heavy-load or towing conditions common with the Ram 3500.
- Regularly check the brake fluid level and color in the reservoir; pale, clear fluid is normal while dark, murky fluid should be replaced.
- Replace brake fluid according to the maintenance schedule in the owner's manual (typically every 2 years) or sooner if moisture content is detected.
- When servicing brakes, perform a complete bleed and flush if the fluid in the system is old or contaminated; do not mix fluids of different types.
- Have a qualified technician inspect the entire braking system if you notice a soft pedal, reduced braking performance, or a spongy feel.
Maintaining correct brake fluid helps ensure consistent stopping power and protects the ABS system in the Ram 3500.
Summary
For a 2020 Ram 3500, DOT 4 brake fluid is the recommended choice, provided it meets FMVSS 116 and SAE J1704 standards. Use fresh glycol-based DOT 4 fluid, avoid silicone-based DOT 5, and follow the manual's service intervals and bleed procedures to keep braking performance reliable over time.