Parts for your 2017 Haval H6-Brake booster

2017 Haval H6 brake booster — what it is, why it matters, and how to look after it

Yes, the 2017 Haval H6 is fitted with a vacuum-assisted brake booster (also called a brake servo). This is supported by Haval/GWM workshop literature for the H6 that details brake booster removal, vacuum hose and one‑way valve checks, and booster testing procedures, the H6 owner’s manual also describes vacuum-assisted braking characteristics (noting increased pedal effort if the engine stalls). For function and diagnosis principles, standard references such as the Bosch Automotive Handbook (vacuum brake booster chapter) align with the H6 system design and operation.

On this model, the brake booster’s job is to use engine vacuum (or a vacuum pump on the turbo-petrol variants) to multiply the driver’s pedal force before it reaches the master cylinder. That means shorter stopping distances with less leg effort, and a more progressive pedal feel around town and on the open road.

For owners, the booster isn’t a regular replacement item, but it does benefit from a few sensible checks during routine servicing:

• Listen for a constant hiss at idle near the pedal area — a sign of a leaking diaphragm or grommet.
• Check the vacuum hose and one-way (check) valve for splits, loose clamps, or internal blockage.
• Look for brake fluid tracking from the master cylinder into the booster — internal seal leaks can damage the booster.
• Do a quick function test: with the engine off, pump the pedal until it firms up, hold light pressure, then start the engine. The pedal should drop slightly as assist comes in.

If the pedal is consistently hard, stopping distances feel longer, or idle quality changes when the pedal is pressed, it’s time for diagnosis. On the H6, that typically starts with vacuum supply testing (especially on turbo engines with a vacuum pump), followed by check-valve verification and booster leak testing as set out in Haval’s workshop procedures.

Replacement usually involves unbolting the master cylinder from the booster and moving it aside, disconnecting the booster pushrod from the pedal, and removing the booster from the firewall. Many technicians keep the hydraulic lines attached to avoid bleeding, if the lines are opened, a proper bleed is required. After refit, the brake light switch and pedal free play should be adjusted to spec, and all fasteners torqued per the service manual. Given brakes are safety-critical, professional fitting is recommended.

Technical sources referenced: Haval/GWM H6 Workshop/Service Manual (Brakes – Brake Booster procedures, 2017 model year), Haval H6 Owner’s Manual (Braking System, vacuum assist notes, 2017), Bosch Automotive Handbook, vacuum brake booster fundamentals.

Popular questions about the 2017 Haval H6 brake booster

How can someone tell if the brake booster on a 2017 Haval H6 is failing?
Common clues include a hard brake pedal, longer stopping distances, a hissing noise under the dash, or a pedal that doesn’t sink slightly when the engine starts after being pumped firm with the engine off. If the engine idle stumbles when the brake is pressed, it can also indicate a vacuum leak. A workshop can confirm with vacuum supply and check‑valve tests as outlined in Haval’s service procedures.

Does replacing the H6 brake booster require bleeding the brakes?
Not always. Many technicians unbolt the master cylinder and carefully move it aside without cracking the brake lines, which avoids bleeding. If the lines are disconnected or disturbed, the system must be bled and the pedal feel verified. After any booster work, the brake light switch and pedal free play need checking.

Is the brake booster a scheduled service item on the 2017 H6?
No. It’s inspected rather than replaced at intervals. During regular servicing, a quick vacuum hose/check‑valve inspection and a simple booster function test are usually enough. Replacement is only required if the diaphragm leaks, the check valve fails, or there’s contamination from brake fluid.