Parts for your 2009 Honda Elysion-Brake booster

2009 Honda Elysion Brake Booster

Technical references confirm the 2009 Honda Elysion is fitted with a vacuum-assisted brake booster (servo). The Honda Elysion Service Manual for RR1–RR6 models includes “Power Brake Booster” inspection and removal/installation procedures, and the Honda EPC parts catalogue lists a “Booster Assy., Brake” with the master cylinder and vacuum check valve. So, yes—this model uses a brake booster.

On the 2009 Elysion, the brake booster multiplies pedal force using engine vacuum from the K24A or J-series V6, giving confident stops without needing a heavy stomp on the pedal. It sits on the firewall, directly behind the master cylinder, and works alongside ABS/VSA. A one-way check valve keeps vacuum stored so there’s assist even if engine vacuum briefly drops.

There isn’t a set replacement interval for the booster itself. As part of regular servicing, it’s smart to:

• Inspect the vacuum hose, clamps and the one-way check valve for cracking, looseness or leaks.
• Listen for hissing at the firewall or inside near the pedal.
• Check pedal feel and run the basic booster test: with the engine off, pump the pedal a few times, hold it, then start the engine—the pedal should drop slightly if the booster’s healthy.

Common clues the booster or its plumbing needs attention include a hard brake pedal, longer stopping distances, a hissing noise, or a rough idle when braking (from a vacuum leak). A sinking pedal is usually the master cylinder, but a failed booster diaphragm can also affect feel.

When replacement is required, a technician will typically:

1. Confirm the fault with vacuum and functional tests.
2. Unbolt the master cylinder from the booster (often without opening brake lines), cap lines if disconnected, and protect paint from fluid.
3. Remove the vacuum hose and check valve, detach the pedal clevis pin, and undo the booster mounting nuts.
4. Install the new booster with a fresh gasket, set the pushrod-to-master clearance to Honda spec, refit everything, and bleed the brakes if lines were opened.

Expect about 1.5–3 hours depending on access. Using a quality OEM or reputable remanufactured unit is recommended. After installation, a road test and scan for ABS/VSA faults ensure everything’s spot on. If the pedal’s suddenly hard or the car won’t idle properly when braking, don’t push your luck—book it in or arrange a tow.

Popular questions about 2009 Honda Elysion brake boosters

Does the 2009 Elysion actually have a brake booster?
Yes. Honda’s service literature for RR1–RR6 Elysion models documents power brake booster testing and replacement, and the official parts catalogue lists the booster assembly, check valve and grommet for 2009 vehicles.

How often should the brake booster be replaced?
There’s no fixed interval. It’s replaced on condition—when tests show it’s not holding vacuum or assist is weak. During routine servicing, a quick booster function test and inspection of the vacuum hose and check valve every 10,000–15,000 km is a good habit.

Is it safe to drive with a failed booster?
A failed booster leaves a very hard pedal and much longer stopping distances, which isn’t safe in city or motorway traffic. A bad vacuum leak can also cause rough running. If the pedal is suddenly hard or the car idles poorly when braking, get it checked and consider a tow.