How to check if the brake booster is airtight?

Check the brake pedal reserve distance with the engine off. Start the engine with the pedal depressed; if it lowers slightly, it's normal. allow the engine to warm up and then turn the key to "OFF". Gently press the brake and if the pedal lowers initially but rises after two or three presses, the booster is airtight.

What is the requirement for removal of the brake booster and ABS/DSC modulator/hydraulic unit?

Removal of the brake booster requires the removal of the ABS/DSC modulator/ hydraulic unit. Due to the need for special diagnostic equipment, this task should only be carried out by a BMW dealer or suitably-equipped specialist.

Genuine BMW 330i Brake Booster

Brake Power Booster

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BMW 330i Power Brake Booster
Part Number: 34336779721
$463.45 MSRP: $639.98
You Save: $176.53 (28%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Brake Servo Unit; Booster Assembly, Brake Booster
- Replaces: 34-33-6-764-130
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 330i | Sedan(E90)
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BMW 330i REPAIR KIT POWER BRAKE UNIT
Part Number: 34336889801
$507.85 MSRP: $707.35
You Save: $199.50 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Booster, Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW 330i | Sedan(G20)
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BMW 330i Power Brake Booster
Part Number: 34336779682
$430.20 MSRP: $594.06
You Save: $163.86 (28%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Brake Servo Unit; Booster Assembly, Brake Booster
- Replaces: 34-33-6-756-851, 34-33-1-164-076
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 330i | Sedan(E46)
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BMW 330i Power Brake Booster
Part Number: 34336872637
$483.66 MSRP: $673.66
You Save: $190.00 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo Unit; Booster, Brake Booster
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2018 BMW 330i | Sedan(F30)
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BMW 330i Power Brake Booster
Part Number: 34337849876
$483.66 MSRP: $673.66
You Save: $190.00 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo Unit; Booster, Brake Booster
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2018 BMW 330i | Sedan(F30)

BMW 330i Brake Booster

The Brake Booster in BMW 330i cars is one of the most important parts that work to increase the pressure for the brake pedal. There are two main types of Brake Boosters used in these vehicles: hydraulic boosters they incorporate hydraulic pressure recovered from the steering pump and the vacuum boosters which operate on the vacuum created by the engine. The vacuum boosters are more preferred and adaptable to different vehicles compared to the described hydraulic boosters. Brake booster is located ahead of the brake pedal and master cylinder and it consists of vacuum chamber having a valve and diaphragm which enhances the input force applied by the driver. In summary, correct function of the Brake Booster results in effective, smooth, and balanced brake usage; therefore, underlining the importance of the Brake Booster in the car's braking mechanism.

If you are looking for OEM BMW 330i Brake Booster, we highly recommend to shop with us. Not only do we offer the most budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 330i Brake Booster that come backed by the manufacturer's warranty.

BMW 330i Brake Booster Parts Questions & Experts Answers

Power Brake Booster
34-33-6-779-721
Q: How to check if the brake booster is airtight?
A: Check the brake pedal reserve distance with the engine off. Start the engine with the pedal depressed; if it lowers slightly, it's normal. allow the engine to warm up and then turn the key to "OFF". Gently press the brake and if the pedal lowers initially but rises after two or three presses, the booster is airtight.
Power Brake Booster
34-33-6-779-721
Q: What is the requirement for removal of the brake booster and ABS/DSC modulator/hydraulic unit?
A: Removal of the brake booster requires the removal of the ABS/DSC modulator/ hydraulic unit. Due to the need for special diagnostic equipment, this task should only be carried out by a BMW dealer or suitably-equipped specialist.