Parts for your 1999 Daihatsu Gran move-Brake master cylinder

1999 Daihatsu Gran Move brake master cylinder: purpose, upkeep, and when to replace

Yes, the 1999 Daihatsu Gran Move (also known as the M100/M101 Pyzar) uses a conventional hydraulic brake master cylinder mounted to a vacuum booster on the firewall. This setup is confirmed in Daihatsu M100/M101 service literature and the Daihatsu Electronic Parts Catalogue, and it’s mirrored across major aftermarket catalogues from brands like Aisin and TRW. So the brake master cylinder is absolutely relevant to this model’s braking system.

On this Gran Move, the brake master cylinder is the heart of the hydraulics. When the driver presses the pedal, the master cylinder converts that effort into hydraulic pressure, sending brake fluid to the front callipers and rear wheel cylinders. Paired with the booster, it provides firm, predictable pedal feel and straight-line stopping. If the master cylinder is tired or leaking internally, the pedal can sink, feel spongy, or the car can take longer to pull up—none of which anyone wants on Aussie or Kiwi roads.

For routine servicing of a 1999 Daihatsu Gran Move brake master cylinder, a few basics go a long way:

• Flush the brake fluid every 2 years or around 40,000 km. Glycol-based fluids attract moisture, which corrodes internals and lowers boiling point.
• Use the specified fluid (DOT 3 is typical for this era, DOT 4 is often acceptable). Never use DOT 5 silicone fluid or mix incompatible types.
• Inspect for dampness around the master cylinder and booster, a low/dirty fluid level, or peeling paint near the reservoir (a tell-tale of leaks).

Considering a replacement? It’s a straightforward job for a competent home mechanic with the right tools, but care is key. Bench-bleed the new unit before fitment to purge air from the internal circuits. Keep the reservoir topped up during bleeding and follow a sensible bleed order (usually the longest line first, often right-rear, left-rear, right-front, left-front). If the vehicle has ABS, avoid running the system dry—some variants bleed conventionally, but check the workshop manual for the correct procedure. Always use new sealing washers where required, tighten fasteners to the manual’s torque specs, and clean any spilled fluid immediately to protect paint. If the pedal still feels soft after bleeding, recheck for trapped air or leaks at unions.

With those boxes ticked, a quality master cylinder will deliver years of safe, consistent braking performance on the Gran Move.

What brake fluid should be used in a 1999 Daihatsu Gran Move master cylinder?

Daihatsu specified DOT 3 glycol-based brake fluid for the Gran Move in this era, and DOT 4 is also commonly acceptable. Avoid DOT 5 silicone fluid. Always check the reservoir cap or the owner’s/service manual for the exact spec and don’t mix incompatible fluids.

How can someone tell if the Gran Move’s master cylinder is failing?

Look for a sinking brake pedal under steady pressure, a spongy feel after repeated stops, a fluid warning light, or visible dampness at the back of the reservoir/booster. If there are no external leaks but the pedal sinks, internal bypassing in the master cylinder is a strong suspect.

Does ABS change the bleeding process on this model?

Some Gran Move variants were offered with ABS. Many can be bled conventionally if the system hasn’t run dry, but it’s important not to let the reservoir empty and to follow the service manual’s steps. If air has entered the ABS modulator, a specific procedure may be needed.