Parts for your 2007 Toyota Highlander-Brake booster

2007 Toyota Highlander (Kluger) Brake Booster

Yes, the 2007 Toyota Highlander (XU20, sold as Kluger in AU/NZ) is fitted with a vacuum brake booster. This is documented in Toyota’s Repair Manual for the Brake System (BR section) for the 2007 Highlander and shown in the Toyota Electronic Parts Catalogue as a “Booster Assy, Brake.” For clarity, the 2007 Highlander Hybrid uses an electronically controlled brake actuator rather than a conventional vacuum booster, as described in Toyota’s New Car Features for the hybrid brake system.

On the petrol Highlander, the brake booster sits on the firewall behind the master cylinder and uses engine vacuum to multiply pedal force. The idea is simple: lighter pedal effort, stronger clamping at the wheels, and better confidence in everyday commuting or a quick stop on a wet Kiwi back road. If the booster or its vacuum supply isn’t up to scratch, the pedal goes hard, stopping distances blow out, and it all feels a bit ordinary.

As part of routine servicing, it’s worth giving the booster and its plumbing a once-over. Quick checks pay off:

• Listen for a faint hiss around the booster after the engine’s shut off, a constant hiss can point to a leaking diaphragm or check valve.
• Test pedal feel with the engine off, then on — the pedal should drop slightly when the engine starts, showing vacuum assist is working.
• Inspect the vacuum hose and one-way valve for splits or oil-softening, and make sure the grommet into the booster is tight.

Replacement is straightforward for a competent tech: disconnect the vacuum line, unbolt the master (leave lines attached and carefully set it aside if possible), remove the booster nuts inside under the dash, and swap the unit. Always set the pushrod-to-master cylinder clearance to spec (from the Toyota BR section) and bleed the brakes if the hydraulic lines were opened. Torque the mounting hardware correctly and verify there’s no vacuum leak at idle.

There’s no fixed replacement interval — boosters generally last many years — but they don’t like contaminated brake fluid or chronic vacuum leaks. If there’s a hard pedal, longer stops, or the engine stumbles when the brakes are applied, don’t muck about, get it diagnosed. A healthy booster keeps pedal effort low, braking strong, and road trips across Oz or Aotearoa that bit less stressful.

Popular questions about 2007 Toyota Highlander brake boosters

How can someone tell if the brake booster is failing on a 2007 Highlander?
Common signs include a hard brake pedal, longer stopping distances, a hissing noise near the firewall, or the engine stumbling when the brakes are pressed at idle. If the pedal drops normally when the engine starts, the booster is usually doing its job. No drop suggests no assist.

Does the 2007 Highlander Hybrid use the same type of brake booster?
No. The 2007 Highlander Hybrid uses an electronically controlled brake system with a hydraulic brake actuator and accumulator rather than a conventional vacuum booster. The petrol (non-hybrid) model uses the traditional vacuum brake booster described above.

Is there any routine maintenance for the brake booster?
The booster itself is largely maintenance-free, but it relies on a sound vacuum supply. During regular services, check the vacuum hose, one-way valve, and booster grommet, and keep brake fluid fresh to protect the master cylinder and seals that work closely with the booster.