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Auto Brake System Parts Brake Booster OE 31274809 Servo Cylinder for Volvo S80 V70
The Brake Booster (also referred to as Servo Cylinder, OE Number: 31274809) is a critical safety component in the hydraulic brake system of select Volvo models, including the S80 (07-) and V70 (08-). Mounted between the brake pedal and the master cylinder, it uses vacuum pressure from the engine (or an electric pump in some variants) to amplify the driver’s brake pedal force—reducing the effort required to slow or stop the vehicle while ensuring maximum braking efficiency.
This OE-grade brake booster features a robust metal housing (typically aluminum or steel for structural integrity), a precision-machined diaphragm (rubber or composite), and a one-way check valve (to maintain vacuum pressure). Unlike generic aftermarket boosters, it adheres to Volvo’s strict engineering standards: its vacuum capacity, force amplification ratio (typically 3:1 to 5:1), and mounting dimensions are calibrated to match the original brake system’s specifications. This eliminates issues like spongy brake pedals, insufficient braking force, or master cylinder damage—common with mismatched components. The booster’s sealed design also prevents vacuum leaks, which are the primary cause of brake assist failure.
Core Functions
Brake Force Amplification: Uses engine vacuum to multiply the driver’s pedal input force by 3–5 times. This reduces braking effort by 60–80% (e.g., applying 10 lbs of pedal force generates 30–50 lbs of force at the master cylinder), making it easier to stop the vehicle—especially critical in emergency braking or for drivers with limited leg strength.
Vacuum Pressure Maintenance: The built-in check valve traps vacuum inside the booster when the engine is off (e.g., during coasting or engine shutdown). This ensures 1–2 additional brake applications with full assist, preventing sudden loss of braking power if the engine stalls.
Master Cylinder Protection: Acts as a buffer between the brake pedal and master cylinder, distributing force evenly to the master cylinder’s pistons. This prevents uneven wear on the master cylinder seals and reduces the risk of internal leaks, extending the master cylinder’s lifespan.
Safety Compliance: Meets global automotive safety standards (e.g., ECE R13H, FMVSS 105) for brake assist reliability. It ensures consistent braking performance across all driving conditions (e.g., cold weather, high altitude) and fails gracefully—if the booster malfunctions, the brake system reverts to manual operation (without assist) rather than complete failure.
Compatible Vehicles
This Brake Booster (OE: 31274809) is specifically tailored for Volvo’s sedan and wagon models from the mid-2000s to mid-2010s. Below is a consolidated list of variants and applicable years:
Model
Applicable Years
Volvo S80 (07-)
2007–2011
Volvo V70 (08-)
2008–2015
Notes: “(07-)” / “(08-)” denote models launched from the specified year onward. For 100% fitment accuracy, confirm compatibility with your vehicle’s VIN (Vehicle Identification Number) or Volvo’s official service manual—this accounts for engine-specific vacuum system designs (e.g., turbocharged vs. naturally aspirated engines) and regional brake system variations.
Frequently Asked Questions
Q: How to determine if the bumper bracket needs replacement?
A: Signs of a failing bumper bracket include visible damage or deformation, misaligned bumper panels, unusual noises from the front end, or if the bumper appears loose or sagging on one side.
Q: What should be paid attention to when replacing the bumper bracket?
A: For optimal results, we recommend professional installation. Key considerations include ensuring proper alignment of all mounting points, checking for additional damaged components, and verifying all fasteners are properly torqued to specification.
Why Choose Our Products
Extensive Industry Experience: 13 years specializing in Volvo auto parts with precise product matching and technical solutions.
Quality Assurance: 10-stage quality inspection process including durability testing, surface roughness analysis, and dimensional verification.
Manufacturing Excellence: 15,000㎡ production base with 10,000+ SKUs in inventory for fast order fulfillment.
Strategic Partnerships: Collaborations with 50+ factories including suppliers to international brands like Bosch and Hella.
Company Profile
Established in Guangzhou China, Womala Auto parts as a comprehensive company with five branches has engaged in Volvo parts for more than 10 years.There are hundreds of professional staff working in our supply department, sales and logistic support departments.Thanks to the deep coop... Company Profile
Established in Guangzhou China, Womala Auto parts as a comprehensive company with five branches has engaged in Volvo parts for more than 10 years.There are hundreds of professional staff working in our supply department, sales and logistic support departments.Thanks to the deep coop...
