Alfa Romeo GTV 916 2.0 Twin Spark RHD — Brake Servo Diagnosis & Sourcing Guide
Vehicle & Part Overview
Vehicle: Alfa Romeo GTV 916 series, 2.0 Twin Spark, Right Hand Drive
Component: Brake servo (vacuum booster unit)
Alfa Romeo OEM Part Number: 60626664
The 916 GTV was produced from 1994 to 2005, meaning even low-mileage examples are now at least 20 years old. Rubber components deteriorate with age regardless of mileage, making servo failure common on well-preserved, low-use cars.
RHD fitment note: Always confirm right hand drive configuration when contacting suppliers. The LHD servo unit will not fit correctly and some suppliers will default to offering the LHD version.
Symptoms & Diagnosis
Reported symptoms:
- Hissing sound audible from inside the cabin
- Soft brake pedal
- Slow/lack of pedal response
Likely causes in order of investigation:
- Vacuum check valve failure — the cheapest and easiest item to check first. Pull the vacuum hose off the check valve on the servo and inspect for cracks or loss of vacuum. Replacements are inexpensive and widely available.
- Failed or partially failed servo diaphragm — hardened or cracked rubber diaphragm can no longer maintain the vacuum differential needed to assist braking. The hiss is vacuum leaking past the damaged diaphragm or seal.
- Air in brake lines — a secondary cause of soft pedal, worth ruling out during inspection.
Safety warning: The combination of a hissing servo and a soft, slow-response pedal is a safety issue. Stopping distances will be significantly increased. Do not continue driving the vehicle until the braking system has been inspected by a brake specialist.
Master Cylinder Notes
If the master cylinder has already been replaced, this points more directly to the servo diaphragm as the cause of the soft pedal and hissing. The servo should be treated as the primary suspect.
On the 916, the master cylinder and servo sit together as a combined assembly. When replacing the servo, it is good practice to inspect the master cylinder at the same time even if recently replaced, to confirm no vacuum leak is affecting its operation.
Sourcing Recommendations
Use OEM part number 60626664 as the reference when contacting any supplier.
- Autodoc — frequently carries Alfa Romeo brake servo units and compatible aftermarket equivalents
- Rimmer Bros — have expanded beyond Triumph and Rover and now stock Alfa Romeo parts
- Euro Car Parts — can cross-reference original Alfa part numbers to aftermarket equivalents
- SNG Barratt — worth checking for any crossover parts applicable to this application
- Alfaowner.com forums — specialist Alfa Romeo community where members often have new old stock or reliable leads on correct RHD servo units
Rebuild vs. Replace
For a low-mileage, well-preserved 916, having the original servo unit professionally rebuilt is often the preferred route. Brake servo reconditioning specialists can rebuild the original unit, keeping the car correct and original. This is worth pursuing before committing to an outright replacement, particularly given the low mileage history.
Safety & Fitment Notes
- Always specify RHD when ordering — the LHD unit will not fit
- Do not delay repair — a failing servo on a performance car presents a genuine safety risk
- Start with the vacuum check valve before assuming the diaphragm has failed — it is a low-cost first step that can rule out a simple fix
- Have the full braking system inspected by a qualified brake specialist or trusted independent Alfa Romeo specialist before returning the vehicle to normal use