Parts for your 2000 Toyota Crown-Brake booster

2000 Toyota Crown brake booster — purpose, care and when to replace

Yes, a brake booster is fitted to the 2000 Toyota Crown (S170 series, e.g., JZS171/JZS173/JZS175/GS171/UZS171). Toyota’s service literature for the S170 Crown Brake System and the Toyota Electronic Parts Catalog both specify a vacuum brake booster (firewall-mounted, behind the master cylinder, listed as “Brake Booster Assy”). These technical sources confirm the booster is a standard part of the Crown’s braking hardware, working with ABS/VSC where fitted.

The booster’s job is to use engine vacuum to multiply the driver’s pedal effort, so the sedan delivers strong, progressive braking with a light, confident pedal. Inside, a diaphragm and control valve translate manifold vacuum into assist, while a one-way check valve holds reserve vacuum for a couple of pedal presses if the engine stalls. It’s a quiet workhorse that helps the big Crown pull up smoothly around town and on the motorway.

As these cars age, looking after the booster is smart. During routine servicing, it’s worth a quick check under the bonnet:

• Inspect the vacuum hose and grommet at the booster for splits, oil softening, or loose clamps.
• Listen for a faint hiss at the firewall when the pedal’s pressed (vacuum leak).
• Check the rear of the master cylinder for fluid seepage—brake fluid can damage the booster’s internal diaphragm over time.
• Pedal feel test: with the engine off, pump the pedal until hard, hold light pressure and start the engine—the pedal should drop slightly as vacuum assist kicks in.

Replacement is straightforward for a workshop familiar with Toyotas: disconnect the battery, move the master cylinder forward without kinking lines, pull the clevis pin at the pedal, swap the booster, set the push-rod length to spec, reassemble, then bleed the brakes using the factory sequence (and follow ABS/VSC procedures as applicable). If a check valve or hose is suspect, replace them at the same time—they’re inexpensive and often the root cause of a hard pedal.

Common signs a Crown’s booster needs attention include a consistently hard pedal, longer stopping distances despite good pads/rotors, a hissing noise at the firewall, or a pedal that doesn’t “sink” slightly at start-up. On a healthy car, the booster should last many years and kilometres, preventative checks each service keep it that way.

Technical sources: Toyota S170 Crown Brake System section (Toyota service manual), Toyota Electronic Parts Catalog listing “Brake Booster Assy” for S170 series.

Popular questions about 2000 Toyota Crown brake boosters

How can someone tell if the booster is failing on a 2000 Crown?
A rock-hard brake pedal, a faint hiss from the firewall when pressing the brakes, longer stopping distances, or no pedal drop when starting the engine are the big giveaways. If there’s brake fluid at the rear of the master cylinder, the booster may also be at risk from internal diaphragm damage.

Does the 2000 Crown use a vacuum or hydraulic booster?
It uses a vacuum brake booster. Petrol S170 Crowns rely on manifold vacuum with a one-way check valve. There’s no hydraulic “hydroboost” unit on this model per Toyota’s brake system documentation and parts cataloguing.

Should the booster be replaced proactively?
Not typically. It’s condition-based. If the pedal feel is normal and there are no leaks or hissing noises, it can be left in service. Replace it when symptoms show, or when related parts (failed check valve, perished hose, leaking master cylinder) suggest the booster has been compromised.