8-98031-414-0 | Genuine Isuzu Hydraulic Brake Booster For NQR, NRR

1. To reduce brake pedal effort
The booster multiplies the driver’s foot force, making braking easier and more responsive.

2. To provide stronger stopping power
Hydraulic pressure delivers higher and more reliable assist—important in heavy vehicles or towing.

3. For vehicles with low or no engine vacuum
Diesel engines, turbocharged engines, and some performance engines don’t create enough vacuum for a traditional brake booster.

4. Better performance under load
Hydraulic boosters work well in trucks, SUVs, and commercial vehicles where greater braking force is needed.

5. Improved braking consistency
Hydraulic systems maintain stable assist even when engine vacuum changes (like during hard acceleration).

1. Hard brake pedal

The pedal becomes stiff and requires much more force to stop the vehicle because the booster isn’t providing assist.

2. Increased stopping distance

The vehicle takes longer to stop due to reduced braking power.

3. Brake pedal feels “grabby” or overly sensitive

The brakes may engage too aggressively if the booster is malfunctioning.

4. Power steering problems

Since the booster often shares pressure with the power steering pump, you may notice:

• Heavy steering

• Whining noises

• Steering that feels jerky

5. Hissing, whining, or squealing noises

These can come from the booster or the hydraulic pump when the system is struggling.

6. Brake fluid or power steering fluid leaks

Leaks around the hydraulic booster, hoses, or connections can cause loss of assist.

7. Pulsating brake pedal

The pedal may vibrate or pulse when hydraulic pressure is unstable.

8. Engine stalling during braking (rare)

A severe hydraulic leak or pump failure can overload the system and cause stalling.

9. Warning lights

You may see ABS, Brake, or Power Steering warnings depending on the system design.