Parts for your 1999 Daihatsu Gran move-Brake booster

1999 Daihatsu Gran Move brake booster: what it does and how to look after it

Based on the Daihatsu factory workshop manual for the Gran Move/Pyzar (Brake System section – Vacuum Booster inspection) and the Daihatsu Electronic Parts Catalogue listing for “Booster Assy, Brake” on 1997–2002 models, the 1999 Daihatsu Gran Move is fitted with a vacuum brake booster mounted on the firewall behind the master cylinder. It’s a standard vacuum-assisted setup using manifold vacuum and a one-way check valve.

The brake booster (often called a servo) is there to multiply pedal effort so the car pulls up smartly without the driver needing to stand on the pedal. Inside the booster, engine vacuum helps a diaphragm push the master cylinder harder than a foot alone could manage, giving a firmer, more confidence-inspiring stop — ideal for everyday Aussie and Kiwi driving, from school runs to open-road cruising.

As part of routine servicing on a 1999 Gran Move, it’s worth giving the booster and its vacuum supply a quick once-over. A tech will check the large vacuum hose for cracks, make sure the one-way check valve holds vacuum, and listen for any tell-tale hissing around the booster while the pedal’s pressed. They’ll also look for brake fluid seeping from the rear of the master cylinder into the booster — a sign the master’s rear seal is on the way out.

A simple home test helps too: with the engine off, pump the brake pedal several times until it goes firm, hold steady pressure, then start the engine. If the booster’s healthy and getting vacuum, the pedal should drop slightly. No drop means a vacuum or booster issue that needs attention before it gets unsafe.

Booster units aren’t typically rebuilt onsite, they’re replaced as an assembly. Replacement involves isolating or carefully moving the master cylinder, swapping the booster, renewing the gasket and grommet, confirming the check valve orientation, and torquing fasteners to the workshop manual spec. If lines are opened, the system must be bled and brake fluid renewed. For best results, brake fluid should be flushed every two years, and the booster/vacuum hose checked at regular services (about every 10,000–15,000 km). Any hard pedal, longer stopping distances, engine idle change when braking, or persistent hissing is grounds to park it and book a repair — it’ll also help avoid WOF/roadworthy headaches.

• Common signs of booster trouble: hard pedal, hissing noise, longer stopping distance, engine stumbling when brakes are applied.
• Service tips: inspect vacuum hose and check valve, check for fluid at master/booster join, confirm pedal drop test, renew fluid every 2 years.

FAQs

Does a 1999 Daihatsu Gran Move have a brake booster?
Yes. The Gran Move (also known as Pyzar) uses a vacuum brake booster on the firewall. This is shown in the factory workshop manual’s brake system section and in the Daihatsu parts catalogue under “Booster Assy, Brake”.

How can someone check the brake booster at home?
With the engine off, pump the brake pedal a few times until it’s firm. Keep pressure on the pedal and start the engine. A healthy booster will let the pedal sink slightly as vacuum assist kicks in. If there’s no change, there may be a vacuum leak, a faulty check valve, or an internal booster fault.

What brake fluid should be used and how often should it be changed?
Use the DOT grade shown on the reservoir cap or in the owner’s manual (commonly DOT 3 on late-90s Daihatsu, with many being compatible with DOT 4). Brake fluid is hygroscopic, so it should be flushed every two years to keep pedal feel consistent and protect internal components, including the master cylinder and ABS parts.