Replace the vacuum check valve for the brake booster

JACOBSCHIMETZ92

MEMBER
2007 HYUNDAI SONATA
3.3L
6 CYL
2WD
AUTOMATIC
140,000 MILES

I am trying to replace the vacuum check valve for the brake booster. I am having trouble locating the valve itself but from what I have researched it may be built into the vacuum line. However, the part I got from Hyundai is a fairly standard three way check valve with some rubber elbows on it? I cannot see anyplace where it my go so I assume I just got an incorrect part and have to order a new hose. There appears to be a union of some kind at a mount on the back of the plenum before the line goes into the manifold itself. This is what I assumed was the check valves location at first glance. Any clarification would be greatly appreciated.

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,867 POSTS

Hi,

Replacing the vacuum brake booster isn't too hard. The most difficult is getting under the dash to unbolt it. There isn't a lot of room.

Regardless, here are the directions for replacement. The attached pictures correlate with the directions.

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2007 Hyundai Sonata
Procedures
Vehicle Brakes and Traction Control Power Brake Assist Vacuum Brake Booster Service and Repair Procedures
PROCEDURES
BRAKE BOOSTER

COMPONENTS

pic 1

REMOVAL
1. Remove the master cylinder.

Pic 2

2. Disconnect the vacuum hose (A) from the brake booster (B).

Pic 3

3. Remove the snap pin (A) and clevis pin (B).
4. Remove the four booster mounting nuts (c).

Pic 4

5. Remove the brake booster (A).

INSTALLATION

pic 5

1. Adjust push rod length of the booster, and then install the seal on the booster assembly.
Standard length (A): 108± 0.5 mm (4.25 ± 0.019 inch)

pic 6

2. Insert the booster and tighten the nuts (c).
3. Connect the booster push rod and brake pedal with a pin (B) and install a snap clevis pin (A) to the clevis pin (B).

CAUTION: Grease the pin before installing the snap pin. Always use a new snap pin.

4. Install the master cylinder.
5. Connect the vacuum hose to the brake booster.
6. After filling the brake reservoir with brake fluid, bleed the system.
7. Check for fluid leakage.
8. Check and adjust the brake pedal for proper operation.

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I hope this helps. Let me know if you have other questions.

Take care and God Bless,

Joe

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