Parts for your 2015 Suzuki Splash-Brake booster

2015 Suzuki Splash brake booster — purpose, checks and servicing tips

Technical sources confirm the 2015 Suzuki Splash is fitted with a vacuum-assisted brake booster (also called a brake servo), making the brake-booster relevant to this model. The Suzuki Splash/Ritz factory workshop manual (Brakes section) details booster inspection and the non-return valve test, Suzuki’s Electronic Parts Catalogue lists a “Booster Assy, Brake” for Splash/Ritz, and the Opel/Vauxhall Agila B (the Splash’s sister car) workshop literature describes the same vacuum servo arrangement. Together, these references establish that the Splash uses a conventional vacuum brake booster mounted between the brake pedal linkage and the master cylinder.

On the 2015 Splash, the brake booster’s job is simple: it uses engine vacuum to multiply the driver’s foot effort, giving a lighter pedal and more consistent stopping with less leg work. Inside the round can under the bonnet is a diaphragm and a one-way check valve. When the engine’s pulling vacuum, the booster helps push the master cylinder pistons, so the car pulls up smartly without a heavy shove on the pedal.

As part of regular servicing, it’s worth giving the booster and its vacuum plumbing a quick once-over. There’s no fixed replacement interval for the booster itself, but a few easy checks keep things sweet:

• Listen for a faint hiss around the booster or vacuum hose with the engine idling — a hiss can mean a vacuum leak.
• Press the pedal several times with the engine off to deplete vacuum, hold the pedal and start the engine — the pedal should sink slightly as assist kicks in. If it doesn’t, suspect the booster or check valve.
• Inspect the vacuum hose and check valve for splits, perishing, or loose clamps. Replace the hose if it’s hardened or cracked.
• If the idle goes rough or the engine stalls when the brakes are applied, the booster diaphragm may be leaking.

Signs a replacement might be due include a hard brake pedal, longer stopping distances, or that tell-tale hissing. Because the booster sits ahead of the master cylinder, replacement usually involves disconnecting the master (without bending the lines), separating the pushrod from the pedal under the dash, and swapping the unit. It’s smart to:

• Use an OE or quality aftermarket servo matched to the Splash/Agila application.
• Check and set the pushrod length to spec to avoid dragging brakes or extra pedal free play.
• Fit a fresh grommet and test the check valve, replace it if in doubt.
• Bleeding isn’t always required if lines stay intact, but be prepared to bleed if the master is disturbed. Brake fluid should be flushed every 2 years regardless.

If the pedal goes rock hard or stopping distance increases, the Splash shouldn’t be driven until the fault’s sorted — no one needs a scare at the next roundabout.

• Does the 2015 Suzuki Splash have a brake booster?
  Yes. The Splash uses a vacuum-assisted brake booster (servo) between the pedal and master cylinder. This is documented in Suzuki’s Splash/Ritz workshop manual and parts catalogue, and also in sister-model Agila B technical literature.
• How can someone tell the Splash’s brake booster is failing?
  Common giveaways are a hard pedal, a hissing noise near the booster, longer stopping distances, or the engine stumbling when the brakes are applied. A quick test is to pump the pedal with the engine off, hold it, then start the engine — if the pedal doesn’t sink slightly, assistance is missing.
• Is replacing the brake booster a DIY job?
  It can be for a confident home mechanic, but access under the dash to the pedal linkage is fiddly. The master cylinder may need to be moved, and the pushrod length must be set correctly. Many owners prefer a workshop to handle it, especially if ABS bleeding becomes necessary.