What is the reason for the Lexus ES's brakes not working properly?

[JasperLee]

The reason for the Lexus ES's brakes not working properly is brake fluid leakage. If the brake fluid leaks severely, there will be no braking at all. It is essential to pay attention to the brake system warning. When the brake system fault light comes on, stop the car promptly to check the brake fluid level and inspect components such as brake hoses, the master cylinder, and wheel cylinders. The Lexus ES has a length of 4975mm, width of 1866mm, height of 1447mm, and a wheelbase of 2870mm. It features a CVT continuously variable transmission and is a 4-door, 5-seater sedan with front-wheel drive. The steering assistance type is electric power steering, and the body structure is unibody.

[Reed]

I've been driving a Lexus ES for five or six years now, and the issue of soft brakes is indeed nerve-wracking. The main problems are concentrated in four areas: excessive wear of brake pads is the most common, especially the rear wheels with electronic parking brakes that are prone to being worn out; deteriorated brake fluid is the most dangerous, as not changing it for two years can lead to excessive moisture content, affecting hydraulic pressure; faulty wheel speed sensors causing ABS to activate erroneously can extend braking distance; and master cylinder leakage is the rarest but most severe issue. Last time, I encountered air in the brake lines, and after several hard brakes, the pedal became so soft that even pressing it all the way down couldn't stop the car. Remember, if you notice the brake pedal travel becoming longer or the pedal feeling soft, don't continue driving—calling a tow truck is much safer.

[DelNorah]

During the last maintenance, the technician mentioned that Lexus brake issues often result from minor problems accumulating. For example, brake squealing during cold starts the day after washing the car is a normal phenomenon caused by rust on the brake discs, which disappears after driving a couple of kilometers. However, persistent brake weakness requires attention to three key points: check if the brake pad thickness is below 3mm (original pads typically last about 60,000 kilometers), observe whether the brake fluid reservoir level has dropped, and inspect the chassis for any oil stains. Hybrid owners are specifically reminded to note that failure of the power recovery system's cooperative braking can also cause the pedal to feel soft. If an emergency brake test at 60km/h results in a stopping distance exceeding 16 meters, it's advisable to promptly visit a service center for inspection.

[WalterMarie]

Just experienced this terrifying incident: couldn't stop in time at a traffic light in the rain! Later inspection revealed brake disc issues. High-temperature continuous braking can cause blue spot heat fade on the disc surface, reducing braking force by 40% directly; winter de-icing salt corrosion at the disc-pad interface is even more dangerous. A specialist mechanic taught me some self-inspection tips: check for oil stains on the wheels when the car is cold, lightly press the brake to listen for any hissing from the booster pump, and listen for friction sounds at the rear wheels when engaging the electronic parking brake. The most vulnerable part of Lexus braking systems is the caliper guide pin - rust seizure can cause single-side brake failure, a hidden issue that requires a lift to detect.

[SanGrace]

Auto repair shops have seen too many owners with brake issues. Three typical symptoms of the Lexus ES are worth noting: steering wheel vibration during hard braking above 40km/h is a precursor to brake disc warping; a spongy pedal feel indicates air in the hydraulic system; and the car's rear swaying during braking suggests caliper seizure. An easily overlooked point is excessive tire wear - when tread depth falls below 1.6mm, braking distance increases by 25% on wet roads. It's recommended to inspect front brake pads every 5,000 km, while rear pads can be checked by taking photos through wheel spokes. For those modifying brake calipers, special attention must be paid to ensuring bridge dimensions are perfectly matched.

[CarterMarie]

A few days ago, my neighbor's ES300h had brake issues, and the inspection revealed that the brake fluid had absorbed moisture. When the water content exceeds 3%, the boiling point of the brake fluid drops from 260°C to 150°C, making it prone to vapor lock during long downhill drives. Here's an interesting fact: the ES hybrid system automatically starts the engine to provide vacuum assist when the battery is sufficiently charged. Additionally, a failed one-way valve in the brake booster can cause the pedal to become hard after the engine is turned off. Normally, the pedal should become hard after three presses. Tire selection is also crucial—the factory-fitted Yokohama 235/45 R18 tires perform 12 meters worse in wet braking compared to Michelin tires. Finally, a reminder: always use DOT4 brake fluid for replacement, and never mix different types!