What type of brake fluid does a 2015 Ram 1500 take?

The 2015 Ram 1500 requires DOT 4 brake fluid that meets FMVSS 116. Always verify with your owner's manual or the fluid cap on the master cylinder, and avoid silicone-based DOT 5 unless the manual specifies otherwise.

Official specification and common practice

Chrysler and Ram manuals for mid‑2010s trucks typically direct use of a glycol‑based DOT 4 brake fluid that complies with the Federal Motor Vehicle Safety Standard (FMVSS) 116. DOT 4 offers higher boiling points than DOT 3 and is generally compatible with the vehicle's ABS/Brake-by-Wire systems. Do not use DOT 5 silicone-based fluids in most Ram models, as they are not compatible with the system seals and can cause other operational issues. Always confirm the exact requirement for your specific vehicle by checking the reservoir cap or the owner’s manual.

To help you navigate the options, here is a quick guide to brake fluid types and why DOT 4 is recommended for a 2015 Ram 1500.

• DOT 3: Glycol-based fluid with lower boiling points; suitable for older vehicles but less resistant to heat buildup.


• DOT 4: Glycol-based fluid with higher boiling points; widely recommended for modern vehicles with ABS, including Ram models.


• DOT 5: Silicone-based fluid; not compatible with many ABS systems and can cause seal and hyper-sensitivity issues in standard Ram brake systems.


• DOT 5.1: Glycol-based, but with properties closer to DOT 4 in performance; compatible with DOT 4 systems but must be compatible with the vehicle design.


• Mixing types is discouraged; once opened, use the same DOT specification for the entire system to avoid performance and corrosion issues.

In practice, this means choosing a DOT 4 fluid that meets FMVSS 116 and avoiding DOT 5 silicone unless your manual explicitly allows it. If in doubt, consult a Ram dealer or a qualified mechanic to verify the proper specification for your exact build date and drivetrain configuration.

How to verify the specification and perform a service

Before performing any brake fluid work, confirm the exact specification for your vehicle and plan the service accordingly. The steps below outline a safe approach to verification and maintenance.

1. Check the master cylinder reservoir cap and any nearby labeling for the required fluid specification (usually DOT 4, FMVSS 116).


2. Consult the owner's manual or a dealership service bulletin to confirm the exact DOT grade accepted for your truck’s year/model/engine/transmission configuration.


3. Use a new, unopened bottle of DOT 4 brake fluid that meets FMVSS 116; avoid reusing old fluid or mixing different DOT grades.


4. If performing a brake fluid flush, bleed air from the system starting at the brake caliper or wheel cylinder furthest from the master cylinder, following the service manual’s procedure or having a professional perform the job.

Following these steps helps ensure correct compatibility and reduces the risk of corrosion or degraded braking performance.

Maintenance considerations and replacement intervals

Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time, which reduces braking performance and can lead to corrosion. For most vehicles, including the Ram 1500, many manufacturers recommend checking and replacing brake fluid roughly every 2 years, though the exact interval can vary based on climate, driving conditions, and vehicle usage. Always follow the schedule in the owner's manual and have a professional perform a full inspection if you notice spongy brakes, reduced braking performance, or unusual color in the fluid.

Buying, storage, and safety notes

When shopping for brake fluid, prioritize quality and compatibility with your Ram 1500’s brake system. Here are some practical tips to keep in mind.

• Purchase DOT 4 brake fluid that meets FMVSS 116; check the packaging for the specification and shelf life.


• Keep the bottle sealed when not in use and store it upright in a cool, dry place away from sunlight.


• Do not mix different brands or DOT grades in an open reservoir to avoid shifting chemical properties within the system.


• Dispose of any old or contaminated brake fluid at an appropriate recycling or disposal facility.

For most Ram 1500 owners, DOT 4 is the correct choice, but always confirm with your specific vehicle’s documentation to avoid incorrect maintenance decisions that could affect brake performance.

Summary

In short, a 2015 Ram 1500 typically uses DOT 4 brake fluid that meets FMVSS 116. Verify the exact specification on the reservoir cap or in the owner’s manual, avoid DOT 5 silicone-based fluids, and follow proper maintenance intervals to preserve braking performance. When in doubt, consult a dealer or trusted mechanic to ensure the right fluid and servicing procedure for your truck.

What kind of brake fluid does a Dodge Ram take?

Prestone – DOT 3 Brake Fluid: MAX Synthetic, Highest Grade, Superior Protection, 100k miles, 32 oz. (Part No. AS410)

Is it okay to mix dot 3 and DOT 4 brake fluid?

Yes, you can mix DOT 3 and DOT 4 brake fluid, as they are chemically compatible, but you should never mix them with DOT 5. Mixing DOT 3 and DOT 4 is acceptable because both are glycol-based. Adding DOT 4 to DOT 3 will lower its boiling point, while adding DOT 3 to DOT 4 will lower its boiling point. 
This video explains the differences between DOT 3 and DOT 4 brake fluid and whether they can be mixed: 1mHVAC Mechanic YouTube · Dec 28, 2021
Compatibility and mixing

• DOT 3 and DOT 4: These are compatible and can be mixed without causing harm to the braking system. 
• DOT 3, 4, and 5.1: These are all compatible with each other and can be mixed. 
• DOT 5: This is silicone-based and is not compatible with DOT 3, DOT 4, or DOT 5.1. Mixing them will cause the system to fail. 

What to consider when mixing

• Boiling point: DOT 4 has a higher boiling point than DOT 3. Mixing them will lower the overall boiling point of the fluid in your system. 
• Performance: If your car requires DOT 4 and you mix it with DOT 3, you will reduce the braking system's performance. 
• Best practice: It is best to check your vehicle's manual and use the specific DOT fluid recommended for your car. If you need to upgrade to DOT 4, it is best to completely flush the old DOT 3 fluid out first to get the full benefits of the DOT 4 fluid. 

This video explains what happens when you mix DOT 3 and DOT 4 brake fluids: 50sMotor MatchupsYouTube · Jan 2, 2024

What kind of brake fluid does a 2015 RAM 1500 take?

FAQs for 2015 Ram 1500 Brake Fluids
DOT 3 Brake Fluid: Synthetic, Prevents Corrosion, Safe For ABS, Disc, Drum Brakes, 50k miles, 12 oz. MAX DOT 3 Synthetic Brake Fluid, 12 oz.

Do I want dot 3 or DOT 4 brake fluid?

You should use DOT 3 or DOT 4 brake fluid based on your vehicle's manufacturer specifications, which can be found in your owner's manual. If your car requires DOT 3, you can upgrade to DOT 4 for its higher boiling point, which is beneficial for high-temperature braking or frequent use, but do not use DOT 3 if your car calls for DOT 4. 
When to use DOT 3

• Daily driving: Most standard cars and trucks use DOT 3 for moderate braking conditions. 
• If specified: Always use DOT 3 if it is the fluid specified by your vehicle's manufacturer. 

When to use DOT 4

• For higher performance: DOT 4 has higher boiling points, making it better for high-performance vehicles or situations where brakes are used frequently, like in hilly terrain or towing. 
• If specified: Some modern vehicles, especially those with ABS systems, may specifically require DOT 4. 
• Upgrading from DOT 3: If your car currently uses DOT 3, you can upgrade to DOT 4 for improved performance and a higher safety margin. The two are compatible and can be mixed, though it's generally recommended to use the higher-spec fluid if you have the option. 

Key differences

• Boiling points: DOT 4 has higher dry and wet boiling points than DOT 3, meaning it can withstand higher temperatures before it begins to boil and lose effectiveness. 
• Moisture absorption: Both fluids are hygroscopic, meaning they absorb moisture over time, which lowers their boiling point. Because DOT 4 has a higher starting boiling point, it has more of a buffer before becoming a safety risk. 

Important considerations

• Check your manual: Always refer to your car's owner's manual for the correct brake fluid specification to ensure compatibility and prevent system damage. 
• Do not use lower-spec fluid: Never use a lower-spec fluid (like DOT 3) in a vehicle that requires a higher-spec fluid (like DOT 4). 
• Do not mix DOT 3 and DOT 5: While DOT 3 and DOT 4 are compatible, DOT 5 is silicone-based and should not be mixed with either glycol-based DOT 3 or DOT 4 fluids.