Brake Servo Kit – Aftermarket (Single Line)

What is this brake servo kit?

This aftermarket brake servo kit is a remote-mounted vacuum assistance unit intended for Austin Healey Sprite and MG Midget models fitted with a single-line hydraulic brake circuit.

It reduces brake pedal effort using a 1.9:1 assistance ratio while keeping the original braking layout in place.

A/R (As Required) means suitability is determined by brake system configuration rather than a fixed chassis breakpoint. The key requirement is a single-line hydraulic circuit and a suitable vacuum source.

Key Benefits

• Reduces pedal effort with a 1.9:1 assistance ratio
• Remote mounted, so positioning can be chosen to suit the engine bay
• Designed for single-line hydraulic brake systems
• Can improve comfort in stop-start driving without altering calipers or wheel cylinders
• Works with a properly maintained standard braking system

Will this fit my Sprite or MG Midget?

Short answer: It fits cars with a single-line brake circuit and an appropriate vacuum take-off.

Which cars is it typically suitable for?

• Austin Healey Sprite models with single-circuit hydraulics (commonly MK1 Frogeye and many MK2–MK4 cars depending on year and specification)
• MG Midget models with single-circuit hydraulics (commonly early cars, depending on year and specification)
• Any Sprite/Midget that has been kept or converted to a single-line setup

When is it not suitable?

• Cars fitted with a factory-style dual-circuit (tandem) master cylinder system
• Installations where a safe vacuum supply cannot be provided
• Cars with known braking faults (servo assistance will not correct underlying hydraulic or friction issues)

If unsure, check whether there is one hydraulic outlet from the master cylinder (single-line) or two separate outlets (dual-circuit). Confirmation before ordering avoids mismatched parts.

What’s Included

• Remote vacuum servo unit (1.9:1 ratio)
• Mounting hardware
• Hydraulic and vacuum connection fittings

Brake pipe routing and mounting position will vary depending on model, engine, and prior restoration work.

Technical Details

• Aftermarket remote brake servo
• Assistance ratio: 1.9:1
• Single-line hydraulic circuit application
• Vacuum operated via inlet manifold supply (where suitable)
• Installed inline within the hydraulic system

Installation & Setup

This servo installs inline within the existing brake hydraulic line and connects to an appropriate manifold vacuum source.

• Competent mechanical knowledge required, braking systems must be treated as safety-critical
• Full bleeding is required after installation
• Brake fluid type must match the car’s existing system specification
• Vacuum hose condition and non-return valve operation should be verified
• Mount the unit away from exhaust heat and moving components, with secure hose routing

After fitting, check for vacuum leaks, hydraulic seepage, and consistent pedal feel before road use.

Why Choose This Servo Kit?

This kit provides a lighter pedal without changing the base braking hardware. The 1.9:1 ratio is intended to reduce effort while keeping progressive control, which suits regular road use and stop-start driving.

It is best viewed as an assistance add-on for a correctly serviced braking system, not a fix for worn cylinders, contaminated linings, or incorrect adjustment.

FAQs