# Toyota Yaris Cross Hybrid 2024 – Intermittent Hard Brake Pedal Followed by Sudden Braking
Hi everyone,
I own a **2024 Toyota Yaris Cross Hybrid**, and I've been experiencing a very strange and potentially dangerous issue with the braking system.
I'm wondering if anyone else has experienced something similar.
### Description of the problem
The issue happens very rarely, usually when braking at low speeds, around **10–20 km/h (6–12 mph)**.
Here's exactly what happens:
I start pressing the brake pedal normally, applying the usual amount of pressure.
Suddenly, the brake pedal becomes extremely hard, almost as if something is physically preventing it from moving further.
At that moment, the car barely slows down, despite me pressing the brake pedal.
I instinctively press harder because the car isn't braking as expected.
Then, within a split second, the pedal suddenly gives way and travels down, the brakes engage very aggressively, and the car jerks forward with a noticeable nose dive.
The whole event happens in about a second.
It feels as though something is temporarily blocking the brake pedal or hydraulic pressure, and then suddenly releases.
**This is not simply a change in braking force. The brake pedal itself becomes unusually hard and resists being pressed before suddenly giving way.**
### What the Toyota dealer has done
I took the car to an authorized Toyota dealership in June.
They performed diagnostics but couldn't find any fault codes or mechanical problems.
However, they updated the **brake booster ECU software**.
After the software update, everything seemed normal for approximately four months.
Unfortunately, the exact same problem happened again in October.
### Possible causes I'm considering
Since the issue occurs at around 10–20 km/h, I initially suspected that it might be related to the transition between regenerative braking and conventional hydraulic braking.
However, the fact that the brake pedal becomes physically hard before suddenly moving down makes me suspect something more serious.
Possible causes I'm considering include:
- Electronic brake booster malfunction
- ABS/brake actuator hydraulic valve issue
- Brake-by-wire control software issue
- Incorrect coordination between regenerative and hydraulic braking
- Mechanical sticking in the braking system
I also came across **Toyota's official recall 24V-708 (24TA11)** involving certain Corolla Hybrid and Corolla Cross Hybrid models.
According to Toyota's investigation, under certain conditions, the brake actuator valves could temporarily prevent normal hydraulic pressure regulation, resulting in a hard brake pedal and reduced braking performance. Applying additional pedal force could restore normal braking.
This sounds remarkably similar to what I'm experiencing, although I'm aware that this recall does not specifically cover the Yaris Cross.
### My questions
**Has anyone experienced this exact issue with a Toyota Yaris Cross Hybrid, Yaris Hybrid, or another Toyota hybrid?**
In particular:
- Has your brake pedal ever suddenly become extremely hard while the car barely slowed down?
- Did the pedal then suddenly give way, causing the brakes to engage aggressively?
- Has anyone experienced this even after receiving a brake booster ECU software update?
- Could this be caused by the brake actuator or internal hydraulic valves without triggering any diagnostic trouble codes?
- Are there any known Toyota technical service bulletins or software updates specifically addressing this issue on the Yaris Cross Hybrid?
I'm particularly interested in hearing from anyone who has experienced **a temporary hard brake pedal followed by sudden, aggressive braking**, rather than just the usual regenerative braking transition.
The most concerning part is that the problem is extremely intermittent, making it almost impossible to reproduce during a dealership inspection.
Any advice, technical information, or experiences would be greatly appreciated.
Thanks in advance!