Onvehicle Inspection

1. INSPECT BRAKE BOOSTER

(a) Check the air tightness.

(1) Start the engine and stop it after 1 or 2 minutes. Depress the brake pedal several times slowly. HINT:

• If the pedal can be depressed to the floor on the 1st time, but cannot be depressed as far on the 2nd or 3rd times, the booster is airtight. If not, inspect the vacuum check valve.

• If the vacuum check valve is normal, replace the brake booster assembly.

(2) Depress the brake pedal while the engine is running, and stop the engine with the pedal depressed.

HINT:

• If there is no change in the pedal reserve distance after holding the pedal for 30 seconds, the booster is airtight. If not, inspect the vacuum check valve.

• If the vacuum check valve is normal, replace the brake booster assembly.

(b) Check the operation.

(1) Depress the brake pedal several times with the engine stopped and check that there is no change in the pedal reserve distance.

(2) Depress the brake pedal and start the engine. HINT:

• If the pedal goes down slightly, the operation is normal. If not, inspect the vacuum check valve.

• If the vacuum check valve is normal, replace the brake booster assembly.

2. INSPECT VACUUM CHECK VALVE

(a) Check the vacuum check valve.

(1) Slide the clip and disconnect the vacuum hose.

(2) Remove the vacuum check valve from the brake booster.

(3) Check that there is ventilation from the booster to the engine, and no ventilation from the engine to the booster.

If any fault is found, replace the vacuum hose assembly.

(4) Install the vacuum check valve onto the brake booster.

(5) Connect the vacuum hose with the clip.

3. INSPECT PROPORTIONING VALVE (w/o ABS)

(a) Remove the bleeder plug from the front brake caliper and rear wheel cylinder.

(b) for Hatchback:

Standard fluid pressure

(1) Install SST and the bleed the air. SST 09709-29018

(2) Raise the front brake caliper pressure and inspect the rear wheel cylinder pressure.

Standard fluid pressure

Front Brake Caliper Pressure

Rear Wheel Cylinder Pressure

1,500 kPa (15.3 kgf/cm2, 218 psi)

1,500 kPa (15.3 kgf/cm2, 218 psi)

5,000 kPa (51.0 kgf/cm2, 725 psi)

2,350 kPa (24.0 kgf/cm2, 341 psi)

Front Brake Caliper Pressure

Rear Wheel Cylinder Pressure

8,000 kPa (81.6 kgf/cm2, 1,160 psi)

3,100 kPa (31.6 kgf/cm2, 450 psi)

HINT:

When inspecting the fluid pressure, inspect the left front and right rear together, and the right front and left rear together. If the rear wheel cylinder pressure is incorrect, replace the proportioning valve. (3) Remove SST. (c) for Sedan:

Was this article helpful?

0 0
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment