How to service and repair the vacuum brake booster on Mercury Mariner?

When repairing the vacuum brake booster start by taking the stoplamp switch off only after positioning the brake pedal at the resting state because trying to remove it with the plunger expanded creates switch damage. Once you remove the stoplamp switch you should throw away the booster push rod clevis-locking pin because it is a single-use component that works by squeezing the locking tabs then pulling it forward. To install new brake booster nuts follow the torque sequence of 23 Nm (17 lb-ft) after you remove and discard the existing four nuts. Disconnect the brake booster vacuum hose/check valve assembly while hybrid vehicles require removal of vacuum pressure sensor together with booster solenoid and booster travel sensor electrical connectors. The two master cylinder nuts must be removed before reinstalling them while new nuts need to be tightened to 30 Nm (22 lb-ft). You should avoid disconnecting the brake tube fittings because you need to gently push forward the brake master cylinder assembly for removing the brake booster. The proper installation of the stoplamp switch requires the brake pedal to remain at the resting position with attached push rod of the booster to prevent any damage or misalignment. The Multi-Calibration Routine must be performed based on scan tool instructions when working on hybrid vehicles.

OEM Mercury Mariner Brake Booster

Brake Power Booster

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6 Brake Boosters found

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Mercury Mariner Brake Booster Part Number: 9M6Z-2005-A
$491.11 MSRP: $805.45
You Save: $314.34 (40%)
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Product Specifications
- Other Name: Booster Assembly - Brake; Power Brake Booster; Booster
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2009-2011 Mercury Mariner | Hybrid | 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV)
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Mercury Mariner Brake Booster Part Number: 6L8Z-2002-A
$109.90 MSRP: $152.03
You Save: $42.13 (28%)
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Product Specifications
- Other Name: Kit - Brake Booster Repair; Booster Assembly
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2008 Mercury Mariner | Base, Convenience, Luxury, Premier | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mercury Mariner Brake Booster Part Number: 5L8Z-2002-BA
Product Specifications
- Other Name: Kit - Brake Booster Repair; Power Brake Booster; Booster Assembly
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | Base, Convenience, Luxury, Premier | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mercury Mariner Brake Booster Part Number: 5L8Z-2002-AA
Product Specifications
- Other Name: Kit - Brake Booster Repair; Power Brake Booster; Booster Assembly
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2006 Mercury Mariner | Base, Convenience, Luxury, Premier | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mercury Mariner Brake Booster Part Number: 9L8Z-2005-A
$155.72 MSRP: $247.27
You Save: $91.55 (38%)
Product Specifications
- Other Name: Booster Assembly - Brake; Power Brake Booster; Booster Assembly
- Manufacturer Note: Service Kit
- Replaces: 8L8Z-2005-A, 8L8Z-2002-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011 Mercury Mariner | Base, Premier | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Mariner Brake Booster Part Number: 6L8Z-2002-B
Product Specifications
- Other Name: Kit - Brake Booster; Power Brake Booster; Booster Assembly; Kit - Brake Booster Repair
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mercury Mariner | Convenience, Luxury, Premier | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

Mercury Mariner Brake Booster

OEM Brake Booster boasts unmatched quality. Each part goes through full quality checks. They adhere to Mercury's official factory standards. These steps remove flaws and inconsistencies. So you can get Brake Booster with long life and a perfect fit. Come to our website and find genuine Mercury Mariner parts. We keep a wide inventory of OEM Mariner parts at the highly affordable prices. It's easy to search, compare, and pick what you need. You'll love the clear info and simple checkout. We offer top-rated customer service, and we reply fast. We also ship promptly to ensure your order arrives on time.

The Brake Booster found in Mercury Mariner is an optional system that works to improve the efficiency of the breaking system by minimizing the effort that the driver has to make. Its actions are mainly mechanical and involve, for instance, a vacuum operation that enhances the force used to engage the brake pedal and passes it by means of the master cylinder resulting in easy braking. The system uses engine vacuum or an auxiliary pump to make the required pressure difference. There are two main types of Brake Boosters used in Mariner vehicles: These are vacuum-operated and hydraulic boosters. There are vacuum boosters which use the pressure difference of the engine vacuum and atmospheric pressure and hydraulic boosters that use pressure from the power steering pump or an electric motor. As much as vacuum boosters are employed to auto start cars, they sometimes develop faults. There are various performances of air wet brake which based on various diaphragms and sizes being used in different versions, most suitable for bespoke cars or restoration projects.

Mercury Mariner Brake Booster Parts and Q&A

Brake Booster
9L8Z-2005-A
Q: How to service and repair the vacuum brake booster on Mercury Mariner?
A:
When repairing the vacuum brake booster start by taking the stoplamp switch off only after positioning the brake pedal at the resting state because trying to remove it with the plunger expanded creates switch damage. Once you remove the stoplamp switch you should throw away the booster push rod clevis-locking pin because it is a single-use component that works by squeezing the locking tabs then pulling it forward. To install new brake booster nuts follow the torque sequence of 23 Nm (17 lb-ft) after you remove and discard the existing four nuts. Disconnect the brake booster vacuum hose/check valve assembly while hybrid vehicles require removal of vacuum pressure sensor together with booster solenoid and booster travel sensor electrical connectors. The two master cylinder nuts must be removed before reinstalling them while new nuts need to be tightened to 30 Nm (22 lb-ft). You should avoid disconnecting the brake tube fittings because you need to gently push forward the Brake Master Cylinder assembly for removing the brake booster. The proper installation of the stoplamp switch requires the brake pedal to remain at the resting position with attached push rod of the booster to prevent any damage or misalignment. The Multi-Calibration Routine must be performed based on scan tool instructions when working on hybrid vehicles.