Car Shakes When Braking at High Speed 2019 Toyota Mirai

Experiencing your car shakes when braking at high speed 2019 Toyota Mirai can be an alarming and uncomfortable sensation. This issue typically manifests as a noticeable vibration through the steering wheel, the brake pedal, or even the entire vehicle when you apply the brakes, especially at highway speeds (above 45-50 mph). While it might start subtly, this shaking can worsen over time and indicates a problem within your braking system or related components that requires prompt attention for your safety and the longevity of your vehicle.

What drivers notice on this 2019 Toyota Mirai

Drivers of the 2019 Toyota Mirai often describe the sensation as a pulsing or shuddering that becomes pronounced as soon as the brake pedal is pressed at higher speeds. This isn't just a minor annoyance; it can affect your confidence in the vehicle's stopping ability and, in severe cases, increase stopping distances. The unique nature of the Mirai, as a fuel cell electric vehicle, means its regenerative braking system works in conjunction with traditional friction brakes, but the symptoms of a physical brake system issue remain consistent with conventional cars.

At a glance: difficulty, repair cost, and diagnostic workflow

• Difficulty Rating: 6/10 — Moderate
• Common Symptoms: Steering wheel vibration: The most common symptom, where the steering wheel shakes or shudders noticeably when you press; Vehicle shuddering: The entire car may shake or vibrate, making for an unsettling braking experience.; Brake pedal pulsation: You might feel a pulsing sensation directly through the brake pedal.; Increased stopping distance: While not always immediately apparent, a compromised braking system can lead to longer dist
• Estimated Repair Cost: $100–$900 (parts + typical shop labor)
• OEM Tooling Required: Standard OBD-II scanner and hand tools

Diagnostic workflow:

1. Confirm the symptom on your vehicle.
2. Scan for stored or pending codes with an OBD-II tool.
3. Inspect the most common causes in this guide (visual checks first).
4. Run verification tests before replacing parts.
5. Repair, clear codes, and verify on a test drive.

Symptoms and warning signs

If your 2019 Toyota Mirai is shaking when braking at high speed, look out for these specific symptoms:

• Steering wheel vibration: The most common symptom, where the steering wheel shakes or shudders noticeably when you press the brake pedal.
• Vehicle shuddering: The entire car may shake or vibrate, making for an unsettling braking experience.
• Brake pedal pulsation: You might feel a pulsing sensation directly through the brake pedal.
• Increased stopping distance: While not always immediately apparent, a compromised braking system can lead to longer distances required to bring the vehicle to a complete stop.
• Unusual noises: Squealing, grinding, or clunking sounds during braking, which can accompany the shaking if brake pads are severely worn or components are loose.
• Reduced braking effectiveness: A general feeling that the brakes aren't as responsive or effective as they once were.

How to verify and confirm the issue

Confirming the source of your 2019 Toyota Mirai's braking shake involves a combination of practical tests and visual inspections:

• Test Drive: Drive your Mirai on a safe road and apply the brakes at various speeds, paying close attention to when and how the shaking occurs. Note if it's consistent at specific speeds or only during heavy braking.
• Visual Inspection of Rotors: Carefully inspect the brake rotors (the shiny discs behind your wheels). Look for visible signs of warping, such as uneven wear patterns, scoring, or discoloration (blue or dark spots) which indicate excessive heat. Run your finger across the rotor surface to feel for ridges or inconsistent smoothness.
• Check Brake Pads: Examine the brake pads for uneven wear. If one side of a pad is significantly thinner than the other, or if pads are worn down to the backing plate, it can cause vibration.
• Inspect Calipers: Check for sticking brake calipers. A sticking caliper can cause a pad to drag, leading to excessive heat and rotor warping. This can be identified by uneven pad wear or a wheel that feels excessively hot after a drive compared to others.
• Wheel Bearing Play: With the vehicle safely jacked up, try to rock the wheel at 12 and 6 o'clock, then 3 and 9 o'clock positions. Any noticeable play could indicate a worn wheel bearing, which can contribute to vibration.
• Tire and Wheel Inspection: While less common for braking-specific shake, check for bent wheels or tires that are out of balance or out-of-round. These can cause general vibrations that might be exacerbated during braking.

Common causes (most likely first)

Addressing the car shaking when braking at high speed on your 2019 Toyota Mirai typically points to one of these common culprits:

• Warped Brake Rotors: This is by far the most frequent cause. Rotors can warp due to excessive heat from heavy braking or uneven cooling, leading to an inconsistent surface that causes the brake pads to grab and release unevenly, resulting in vibration.
• Uneven Brake Pad Wear: If brake pads wear unevenly, or if they are contaminated with oil or grease, they can cause an inconsistent friction surface against the rotor, leading to shuddering.
• Sticking Brake Calipers: A caliper piston that doesn't retract fully can cause the brake pad to continuously drag against the rotor, generating excessive heat and leading to premature wear and warping.
• Loose or Worn Wheel Bearings: Worn wheel bearings can introduce play into the wheel assembly, which can manifest as vibration, especially under the load of braking.
• Suspension Component Wear: Worn ball joints, tie rod ends, or control arm bushings can allow excessive movement in the suspension, which becomes noticeable as a shake or shimmy during braking.
• Tire Imbalance or Runout: While usually causing vibration at all speeds, an extremely unbalanced or out-of-round tire can sometimes contribute to or worsen a braking shake.

Related guides on this vehicle

• Steering Wheel Shakes or Vibrates at Highway Speed 2017 Toyota Corolla
• AC Blowing Hot Air When Car Is Idling 2017 Toyota Land Cruiser
• 2016 Toyota Rav4 Vibrates Excessively at Highway Speed

Step-by-step diagnosis and fixes

Here's a systematic approach to diagnose and fix the shaking issue in your 2019 Toyota Mirai:

1. Safety First: Always work on a level surface, use jack stands, and ensure the vehicle is secure before beginning any work.
2. Inspect Brake Rotors and Pads:
   • Remove the wheels. Visually inspect the rotors for signs of warping, deep grooves, or excessive rust.
   • Measure rotor thickness with a micrometer to ensure it's within specifications. Uneven thickness is a strong indicator of warping.
   • Check brake pad thickness and inspect for uneven wear or glazing. Replace if worn below minimum specifications.
3. Check Brake Calipers:
   • Ensure the caliper slides move freely. If they are seized, clean and lubricate them, or replace the caliper if necessary.
   • Check for proper piston retraction. A C-clamp can be used to push the piston back into the caliper. If it's stiff or doesn't move smoothly, the caliper may be faulty.
4. Examine Wheel Bearings:
   • With the wheel off the ground, grasp the wheel at 12 and 6 o'clock and attempt to rock it. Repeat at 3 and 9 o'clock. Any play indicates a worn wheel bearing.
5. Inspect Suspension Components:
   • Look for worn or torn rubber bushings on control arms, sway bar links, and tie rod ends. Any excessive play in these components can contribute to braking vibration.
6. Tire and Wheel Assessment:
   • Check for bent wheels, damaged tires, or signs of improper tire balancing. Consider having your tires rebalanced or rotated.

For general repair advice and guides, you can always check out our All repair guides.

Repair options and cost factors

The most common repair for a car that shakes when braking at high speed is brake service. The cost will vary depending on which components need attention:

• Rotor Resurfacing or Replacement: If rotors are only slightly warped and still within minimum thickness, they can sometimes be resurfaced (machined smooth). More often, replacement is recommended for significant warping or if they are below minimum thickness. Rotors are typically replaced in pairs on an axle.
• Brake Pad Replacement: Always replace brake pads when replacing or resurfacing rotors. Use high-quality pads to ensure optimal performance and longevity.
• Brake Caliper Replacement: If a caliper is sticking or seized, it will need to be replaced. This is often done in pairs on an axle to ensure balanced braking.
• Wheel Bearing Replacement: A worn wheel bearing will require replacement. This can be a more involved repair, sometimes requiring special tools.
• Suspension Component Repair: Replacing worn bushings, ball joints, or tie rod ends will address any play in the suspension system.

Factors influencing cost include parts quality (OEM vs. aftermarket), labor rates, and whether you perform the work yourself or take it to a professional.

When to see a professional

While many DIY enthusiasts can tackle brake jobs, there are times when professional help is advisable for your 2019 Toyota Mirai:

• Difficulty Diagnosing: If you've performed basic checks and can't pinpoint the exact cause of the shaking.
• Specialized Tools: Some repairs, like pressing in new wheel bearings or diagnosing complex ABS issues, require specialized tools or diagnostic equipment.
• Safety Concerns: Brakes are a critical safety system. If you're unsure about any step or the integrity of your repair, it's always safer to consult a certified technician.
• Recurring Issues: If the problem returns shortly after a repair, a professional can offer a more in-depth diagnosis.

For more information about your specific vehicle, you can always Browse vehicles on our site.

Frequently asked questions

Can warped rotors cause a 2019 Toyota Mirai to shake only at high speeds?

Yes, warped brake rotors are a primary cause of vibration specifically at higher speeds. At lower speeds, the rotational speed of the rotor is slower, making the inconsistencies less noticeable. As speed increases, the rapid contact of the brake pads with the uneven rotor surface creates a more pronounced shudder or shake.

Is it safe to drive my 2019 Toyota Mirai if it's shaking when I brake?

Driving with a shaking sensation during braking is generally not safe and should be addressed as soon as possible. While minor shaking might not immediately lead to catastrophic failure, it indicates a compromised braking system that can reduce stopping power, increase stopping distances, and worsen over time, potentially leading to more severe issues or accidents.

Does the regenerative braking system on a Toyota Mirai affect this shaking issue?

The regenerative braking system on your 2019 Toyota Mirai primarily uses the electric motor to slow the vehicle and recharge the battery, reducing reliance on the friction brakes. However, when more aggressive braking is needed, or at very low speeds, the traditional friction brakes engage. If the friction brake components (rotors, pads, calipers) are faulty, they will still cause shaking, even with the regenerative system assisting.

Sources and further reading

This information is intended for general guidance and is not a substitute for OEM service procedures; always use a qualified technician for safety-critical work.

Related pages

• All repair guides
• Browse vehicles

Explore related guides on ClearTheCode

• Browse OBD-II codes
• All repair guides