How to inspect and maintain Brake Booster and brake system, including disc brakes, drum brakes, and the parking brake on Subaru Legacy?

In addition to specified intervals, brakes should be inspected every time the wheels are removed or when a defect is suspected. Symptoms indicating potential brake system defects include the vehicle pulling to one side when the brake pedal is pressed, squealing or dragging noises when brakes are applied, excessive brake pedal travel, pedal pulsations, or brake fluid leaks, usually onto the inside of the tire or wheel. To inspect disc brakes, loosen wheel lug nuts, raise the vehicle on jackstands, remove the wheels, and check pad thickness by inspecting through the caliper's inspection window. Replace pads if lining material is too thin. If uncertain, remove the caliper for further inspection. Clean and re-measure pads with brake cleaner. Measure disc thickness with a micrometer and inspect for damage. Before reinstalling wheels, check brake lines and hoses for damage, wear, leakage, and proper routing. For drum brakes, ensure the parking brake is off, remove the drums, and clean the brake assembly. Note lining thickness on brake shoes, replace if necessary, and check for cracks or glazing. Examine components for fluid leakage, and check the wheel cylinders for signs of leakage. Wipe the inside of the drum, inspect it for imperfections, and repeat the procedure for the other wheel. For the brake booster, perform a series of tests as described while seated in the driver's seat. If the brakes do not operate as described, the brake booster has failed. To check the parking brake, park the vehicle on a steep hill with the parking brake set and the transaxle in Neutral to ensure it can prevent the vehicle from rolling. Adjust the parking brake if necessary.

Genuine Subaru Legacy Brake Booster

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25 Brake Boosters found

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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AJ01A
$295.31 MSRP: $417.10
You Save: $121.79 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Replaced by: 26402AJ201
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2014 Subaru Legacy | 2.5GT Limited, 2.5GT Premium, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 2.5L H4 DOHC, 2.5L H4 SOHC, 2.5L H4 Turbo, 3.6L H6
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Subaru Legacy Gasket Booster
Part Number: 26467AJ00A
$4.55 MSRP: $6.32
You Save: $1.77 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Gasket; Booster Assembly Gasket
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2017 Subaru Legacy | 2.5GT Limited, 2.5GT Premium, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 2.5L H4, 2.5L H4 DOHC, 2.5L H4 SOHC, 2.5L H4 Turbo, 3.6L H6
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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AE32A
$126.72 MSRP: $176.00
You Save: $49.28 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2004 Subaru Legacy | Base, Brighton, Cold Weather, Flat6, Flat6 L.L.Bean, Flat6-S, GT, L, Limited, SUS Flat6, SUS Limited | 2.5L H4, 3.0L H6
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Subaru Legacy Vacuum Booster Assembly
Part Number: 26402AJ17A
$295.31 MSRP: $417.10
You Save: $121.79 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 26402AJ201
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012 Subaru Legacy | 2.5GT Limited, 2.5i, 2.5i Limited, 2.5i Premium, 3.6R, 3.6R Limited, 3.6R Premium | 2.5L H4 SOHC, 2.5L H4 Turbo, 3.6L H6
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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AL12A
$104.28 MSRP: $144.83
You Save: $40.55 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Vac BSTR Assembly Lh
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2018-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 3.6R, 3.6R Limited, 3.6R Premium | 2.5L H4, 3.6L H6
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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AL13A
$107.83 MSRP: $149.77
You Save: $41.94 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Vac BSTR Assembly Lh
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2018-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R Limited, 3.6R Touring | 2.5L H4, 3.6L H6
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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AG15A
$367.92 MSRP: $525.00
You Save: $157.08 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Replaced by: 26402AG260
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2007-2009 Subaru Legacy | 2.5i, 2.5i Base, 2.5i Limited, 3.0R, 3.0R Limited, 3.0R LL-Bean, Base, GT, GT Limited, XT Limited | 2.5L H4, 2.5L H4 Turbo, 3.0L H6
View related parts
Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AE05A
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2000-2001 Subaru Legacy | Base, Cold Weather, Flat6, Flat6 L.L.Bean, GT, L, Limited, SUS Limited | 2.5L H4, 3.0L H6
View related parts
Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AG05A
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005-2006 Subaru Legacy | GT, GT Limited | 2.5L H4 Turbo
View related parts
Subaru Legacy Vac BSTR Assembly LH
Part Number: 26402AN00A
$111.94 MSRP: $155.47
You Save: $43.53 (28%)
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4 DI
View related parts
Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AG04A
Product Specifications
- Other Name: Vacuum Booster Assembly; Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005-2006 Subaru Legacy | 2.5i, 2.5i Limited | 2.5L H4
View related parts
Subaru Legacy Vacuum Booster Assembly
Part Number: 26402FA061
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1995-1999 Subaru Legacy | Post | 2.2L H4 , 2.2L H4 (New EVAPO), 2.2L H4 Series
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Subaru Legacy Vacuum Booster Assembly
Part Number: 26402AE200
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2001 Subaru Legacy | Flat6 | 3.0L H6
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Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AE47A
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2003-2004 Subaru Legacy | Baja, Baja-B, Baja-S | 2.5L H4, 2.5L H4 Turbo
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Subaru Legacy Vacuum Booster Assembly
Part Number: 26402AC110
Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1999 Subaru Legacy | L | 2.2L H4 Series
View related parts
Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AE04A
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2000-2001 Subaru Legacy | Brighton | 2.5L H4
View related parts
Subaru Legacy Vacuum Booster Assembly
Part Number: 26402AE310
Product Specifications
- Other Name: Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2004 Subaru Legacy | Flat6, SUS Flat6 | 3.0L H6
View related parts
Subaru Legacy Vacuum BSTR Assembly LH
Part Number: 26402AG06A
Product Specifications
- Other Name: Vacuum Booster Assembly; Booster Assembly, Brake Booster
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005-2006 Subaru Legacy | 2.5i, 2.5i Limited, 3.0R, 3.0R Limited, 3.0R LL-Bean, GT, GT Limited | 2.5L H4, 2.5L H4 Turbo, 3.0L H6
View related parts
Subaru Legacy Vacuum Booster Assembly
Part Number: 26402FA071
Product Specifications
- Other Name: Brake Booster
- Replaces: 26402FA070
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1995-1999 Subaru Legacy | Base, Brighton, L | 2.2L H4 , 2.2L H4 (New EVAPO), 2.2L H4 Series
View related parts
Subaru Legacy Master Vacuum Assembly
Part Number: 26402AA264
Product Specifications
- Other Name: Vacuum Booster Assembly; Brake Booster
- Replaces: 26402AA260, 26402AA262, 26402AA261, 26402AA263
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1991-1994 Subaru Legacy | Turbo

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Subaru Legacy Brake Booster

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Subaru Legacy Brake Booster Parts Questions & Experts Answers

Vacuum BSTR Assembly LH
26402AE32A
Q: How to inspect and maintain Brake Booster and brake system, including disc brakes, drum brakes, and the parking brake on Subaru Legacy?
A: In addition to specified intervals, brakes should be inspected every time the wheels are removed or when a defect is suspected. Symptoms indicating potential brake system defects include the vehicle pulling to one side when the brake pedal is pressed, squealing or dragging noises when brakes are applied, excessive brake pedal travel, pedal pulsations, or brake fluid leaks, usually onto the inside of the tire or wheel. To inspect disc brakes, loosen wheel lug nuts, raise the vehicle on jackstands, remove the wheels, and check pad thickness by inspecting through the caliper's inspection window. Replace pads if lining material is too thin. If uncertain, remove the caliper for further inspection. Clean and re-measure pads with brake cleaner. Measure disc thickness with a micrometer and inspect for damage. Before reinstalling wheels, check brake lines and hoses for damage, wear, leakage, and proper routing. For drum brakes, ensure the parking brake is off, remove the drums, and clean the brake assembly. Note lining thickness on brake shoes, replace if necessary, and check for cracks or glazing. Examine components for fluid leakage, and check the wheel cylinders for signs of leakage. Wipe the inside of the drum, inspect it for imperfections, and repeat the procedure for the other wheel. For the brake booster, perform a series of tests as described while seated in the driver's seat. If the brakes do not operate as described, the brake booster has failed. To check the parking brake, park the vehicle on a steep hill with the parking brake set and the transaxle in Neutral to ensure it can prevent the vehicle from rolling. Adjust the parking brake if necessary.