Vehicle price comparison
Mercedes S Class vs Audi Q3 Master Cylinder prices
Saurabh Kumar
Co-Founder & CTO, Part Price Guide
Built the pricing pipeline that collects and normalizes used OEM part listings from salvage yards and online marketplaces across the US.
Ambika Sharma
Co-Founder & COO, Part Price Guide
12 years of project management and technical operations experience. Reviews price guides for sample size, fitment accuracy, and data freshness.
Price face-off
Median price comparison
Condition comparison
How does the price differ by part grade?
Market analysis
Why does the Mercedes S Class master cylinder cost more?
A used Mercedes S Class master cylinder carries a median asking price of $87, which is 14% higher than the Audi Q3 at $76. Supply also plays a role: Mercedes S Class has 1,219 priced listings versus 331 for Audi Q3, and more listings generally mean more choices and more competitive pricing.
Our guide covers 11 model years for the Audi Q3 (2015–2025) but only 9 for the Mercedes S Class (2015–2024), so the Audi Q3 data reflects a broader range of generations.
Only 65% of Mercedes S Class master cylinder listings include a posted price (1,219 of 1,881 observed) — the rest are "call for price," which usually signals negotiable or higher-than-average pricing.
The Audi Q3 master cylinder is interchangeable across 20 model years versus just 15 for the Mercedes S Class — that wider compatibility window means more donor vehicles in salvage yards and tends to push prices lower.
At Grade A (excellent) condition, the Audi Q3 is 23% cheaper ($76 vs $99) — the gap narrows compared to the overall median difference.
Buyer's checklist
What to check before buying a used brake master cylinder
- Verify reservoir port style, fluid level sensor connector pin count, and brake line flare port sizes and locations (metric vs imperial threads).
- Check bore size specifications, as vehicles equipped with heavy-duty tow packages or larger brake calipers use larger diameter master cylinder bores.
- Inspect primary and secondary piston bore seals for internal bypass leaks, fluid weeping at the brake booster mounting flange, or dark sludge build-up.
- Confirm whether the unit is designed for vacuum-assisted, hydro-boost, or electro-hydraulic brake systems.
Full price guide
Mercedes S Class Master Cylinder
$45 – $175 · 1,219 listings
Full price guide
Audi Q3 Master Cylinder
$51 – $150 · 331 listings
Common questions
Mercedes S Class vs Audi Q3 master cylinder FAQ
Is a used Mercedes S Class master cylinder cheaper than a Audi Q3?
Audi Q3 has the lower median by $11 (14%). The Audi Q3 master cylinder ranges from $51 to $150 across 331 listings, while the Mercedes S Class ranges from $45 to $175 across 1,219 listings.
Can I use a Mercedes S Class master cylinder in a Audi Q3?
This comparison describes pricing, not interchangeability. Even when two parts share similar prices, they may require different engines, trims, electronics, or mounting points. Always match the seller's part number against your VIN before purchasing.
How many listings does this comparison cover?
This comparison draws from 1,219 priced Mercedes S Class listings and 331 priced Audi Q3 listings — 1,550 in total.
How does condition grade affect the price?
Part condition significantly impacts price. Grade A (Excellent): Mercedes S Class $99 vs Audi Q3 $76. Grade B (Good): Mercedes S Class $100 vs Audi Q3 $99. Grade A parts are in excellent condition, B is good, and C is fair — always confirm grading criteria with the seller.
Are there different trim variants to choose from?
Yes. The Mercedes S Class master cylinder has 1 trim variant and the Audi Q3 has 2. Variants differ by engine size, drivetrain, or part number — matching the right variant is critical for proper fitment.
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