Parts for your 2014 Holden Commodore-Brake booster

2014 Holden Commodore Brake Booster — What it Does and How to Look After It

Based on technical sources including the Holden VF Commodore Service Manual (GM Global Service Information, Brake System section) and GM Holden parts catalogues for the 2013–2017 VF platform, the 2014 Holden Commodore is fitted with a vacuum-operated power brake booster (servo) across V6 and V8 variants. The Bosch ABS/ESC architecture used on VF models is designed to work with a conventional vacuum booster rather than an electric or hydroboost unit, so a brake booster is absolutely relevant on this vehicle.

The brake booster on a 2014 Holden Commodore takes engine vacuum and uses it to amplify pedal force, so drivers get strong braking with far less leg effort. It sits between the brake pedal linkage and the master cylinder, typically as a tandem-diaphragm vacuum servo for solid assistance at everyday pedal pressures. When it’s healthy, pedal feel is consistent, stops are confident, and the ABS/ESC system can do its best work.

While the booster itself isn’t a regular “consumable,” it does benefit from sensible servicing checks. Workshops looking after a VF Commodore will usually inspect the vacuum hose from the intake manifold, the one-way check valve, and the grommet at the booster for age-related cracking or leaks. Any hissing under the bonnet when pressing the pedal, a suddenly hard pedal, longer stopping distances, or a rough idle when braking can point to a vacuum leak or a failing booster diaphragm. If brake fluid has wept from the master cylinder into the booster, the internal diaphragm can be damaged over time, so any fluid leak at the rear of the master needs attention straight away.

Replacement is straightforward for a pro but involves care: the master cylinder is unbolted and moved aside, the booster is detached from the pedal clevis under the dash, and the vacuum line and check valve are swapped over. After refitting, the brake hydraulic system must be bled correctly (DOT 4 fluid is typical for VF), and a pressure or scan-tool-assisted bleed may be needed if air enters the ABS modulator. A road test to verify pedal feel and booster assist is essential. As part of routine servicing, owners are well served by:

• Flushing brake fluid every 2 years or 40,000 km.
• Inspecting the vacuum hose, check valve, and booster grommet at each service.
• Addressing any pedal hardness, hissing, or idle change under braking promptly.

Kept in good nick, the VF Commodore’s brake booster delivers the light, confidence-inspiring pedal the car is known for around Australia and New Zealand.

Popular questions about 2014 Holden Commodore brake boosters

Does the 2014 VF Commodore use a vacuum or an electric brake booster?
It uses a vacuum-operated booster. The VF platform pairs its Bosch ABS/ESC with a conventional vacuum servo sourced from engine manifold vacuum, including on V6 and V8 models. There’s no electric or hydroboost unit on standard 2014 VF trims.

What are the common signs a VF Commodore brake booster or check valve is failing?
Classic symptoms include a hard brake pedal, longer stopping distances, a hissing noise near the firewall when the pedal is pressed, or a rough/low idle during braking. If the one-way check valve sticks or the hose splits, assist can drop away after a few pedal presses with the engine off.

Is bleeding the ABS module required after a booster replacement?
If the hydraulic circuit is opened or air enters the ABS modulator while moving the master cylinder, a scan-tool-assisted bleed is recommended. If the master remains sealed and lines aren’t cracked, a standard wheel-end bleed usually suffices, but a firm, even pedal should always be confirmed on a road test.