Classic Obsession: Rolls-Royce Corniche Restoration | Replacing Brake Pumps & Troubleshooting Leaks

Unlike conventional braking systems, the Rolls-Royce Corniche uses a hydraulically powered braking system driven by pumps mounted on the engine. These pumps pressurize the hydraulic fluid, which in turn powers the brake accumulators, providing consistent and powerful braking assistance.

When these pumps fail, the braking system loses pressure, leading to dangerously unreliable stopping power. Clearly, this was a repair that couldn’t wait.

Gary first inspects the undercarriage and finds three distinct drip points forming below the gearbox. The brake pumps sit directly above this area, making them the prime suspect for the leak.

• Initial Findings: The rear brake pump is completely soaked in LHM fluid.
• Potential Causes: A failed seal, a damaged pump housing, or a loose fitting.
• Unusual Factor: The system isn’t under pressure, meaning the leak is passive, likely due to worn-out seals.

✅ Gary’s Theory: The brake pump seals have degraded, allowing fluid to seep out even when the system is off.

Before replacing the entire brake pump assembly, Gary tries a cheaper and faster alternative:

• New brake pump housings
• Fresh O-rings
• Connector seals for hard pipes

Quick Fix Attempt:

1. Remove the feed pipe to inspect movement.
2. Install new seals and housings.
3. Check if this resolves the leak before moving to full replacement.

Result? The leak persists, meaning the brake pumps must be replaced.

With the diagnosis confirmed, Gary turns to IntroCar’s Prestige Parts for a new set of brake pumps. These units are brand-new, offering better durability than rebuilt alternatives.

Brake Pump Replacement Process:

1️⃣ Remove the intake pipes for better access.

2️⃣ Use a specialized castellated wrench to remove the old pumps.

3️⃣ Extract the brake rod and inspect for wear or damage.

4️⃣ Install the new brake pumps, ensuring seals are properly seated.

5️⃣ Reinsert the brake rod and reassemble the system.

✅ Key Discovery: The brake rod, which pressurizes the system, had started to flatten over time—a common issue that can lead to poor braking performance. Luckily, Gary caught it in time.

With the old pumps removed, Gary meticulously cleans the surrounding components:

• Red Rubber Grease is applied to new seals for optimal lubrication.

• A small magnet is used to check for debris in the pump cavity.

• Surrounding corrosion is cleared to prevent future leaks.

✅ Key Tip: If replacing both brake pumps and rods, clearance adjustments are required. Since Gary is reusing the original brake rods, no additional calibration is needed.

With the new brake pumps installed, Gary pressurizes the system and checks for leaks.

The result? SUCCESS!

• No fluid leaks—the new pumps hold pressure perfectly.

• The brake system is fully operational once again.

✅ This repair not only fixed the immediate leak but also extended the lifespan of the entire braking system.

A brake fluid leak in a Rolls-Royce Corniche is never a small issue—especially when dealing with LHM hydraulic systems. In this episode of Classic Obsession, Gary Mavers tackles a significant brake fluid leak, tracking its source to the brake pumps. But will replacing them fix the issue or lead to even bigger discoveries? Watch the full episode here:

Owning and maintaining a Rolls-Royce Corniche requires attention to detail, especially with its highly pressurized hydraulic system.

Key Takeaways from This Episode:

✔ Brake fluid leaks should never be ignored—they often signal larger system failures.

✔ Trying a simple fix first can sometimes work—but always be ready for a full replacement.

✔ Using high-quality parts from IntroCar ensures long-term reliability.

✔ Having the right tools (like a castellated wrench) makes complex jobs far easier.

✔ Cleaning the surrounding area before reassembly helps prevent future leaks.

With the brake system fully restored, Gary is one step closer to having this classic Corniche back in peak condition.

IntroCar is the leading international supplier of Rolls-Royce & Bentley parts, providing specialists and enthusiasts with expert knowledge and an unmatched range of original, aftermarket, recycled, and reconditioned components. We are proud to support Gary Mavers of the Classic Obsession YouTube channel, supplying the essential parts for his Rolls-Royce Corniche restoration projects. While Gary works on a variety of classic cars, his meticulous approach to maintaining and restoring Rolls-Royce models aligns with our commitment to keeping these iconic vehicles on the road.