How to test and replace the Brake Booster servo unit on 2015 Audi A3?

Depress footbrake to exhaust vacuum, start engine holding pedal; a give indicates vacuum. If pedal firms, brake booster works; otherwise check non-return valve and, if applicable, vacuum pump, then renew. Remove master cylinder, hoses, wiring; disconnect pedal, unbolt and extract. Refit with new gasket, reassemble, and check for leaks and braking.

Genuine 2015 Audi A3 Brake Booster

Brake Power Booster

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2 Brake Boosters found

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2015 Audi A3 Booster Assembly Part Number: 5Q1-614-106-Q
$236.80 MSRP: $331.65
You Save: $94.85 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Brake Servo; Booster, Booster Assembly, Brake Booster
- Replaces: 5Q1-614-106-K, 5Q1-614-106-B
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 5Q1-614-106-Q
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following 2015 Audi A3 Submodels:
- Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige, Titanium | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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2015 Audi A3 Booster Assembly Part Number: 8V1-612-107-A
$294.51 MSRP: $412.49
You Save: $117.98 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Brake Servo; Booster Assembly
- Item Weight: 9.30 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 8V1-612-107-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following 2015 Audi A3 Submodels:
- Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige, Titanium | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS

2015 Audi A3 Brake Booster Parts and Q&A

Q: How to test and replace the Brake Booster servo unit on 2015 Audi A3?
A: Depress footbrake to exhaust vacuum, start engine holding pedal; a give indicates vacuum. If pedal firms, brake booster works; otherwise check non-return valve and, if applicable, vacuum pump, then renew. Remove master cylinder, hoses, wiring; disconnect pedal, unbolt and extract. Refit with new gasket, reassemble, and check for leaks and braking.