Brakes - Drum Brake Wheel Cylinder Leakage Inspection

SOURCE: Hyundai Tech Net Times Volume 15 Issue 1 2005

TITLE: Drum Brakes Wheel Cylinder

APPLIES TO: All Hyundai vehicle drum brakes.

SERVICE TIP:

This is the procedure to inspect drum brake wheel cylinders for brake fluid leakage while inspecting the rear brakes.

NOTE: This procedure applies to all Hyundai vehicle drum brakes.

SERVICE PROCEDURE:

1. Check the brake fluid level and condition in the master cylinder.

NOTE: Low brake fluid level or dirty brake fluid indicates a need to perform a thorough inspection of the entire brake system.

2. Start the engine and depress the brake pedal a few times.

3. Shut the engine off and pump the brake pedal a few times, holding it applied for 5 seconds each time.

NOTE: Observe the brake pedal effort and if the pedal continues to travel after being pushed and held down.

4. Raise and support the vehicle on a hoist.

5. Remove the rear wheels.

6. Remove the brake drum retaining screw from each brake drum.

7. Remove the brake drums.

8. Inspect the drum brake wheel cylinders for brake fluid leak as follows:

A. Brake fluid dripping: If the brake shoes, brake hardware, brake drum, backing plate, etc. are soaked with brake fluid, and if the brake pedal was observed to continue to travel slowly in step 3, the brake system is leaking and appropriate repair procedures must be applied to restore the brake system.

B. Brake fluid build-up on and around the wheel cylinders: If dampness and/or a light sheen is observed on and around the brake wheel cylinders, this condition must be inspected further as follows:

a. Check the wheel cylinder piston for free movement by rocking the shoes or pushing each piston with a screwdriver or a similar tool.

NOTE: A seized wheel cylinder piston must be replaced using the appropriate repair procedures provided in the Shop Manuals.

b. Remove the wheel cylinder dust covers using a dull pick or a small screwdriver. If one or more brake fluid drops are observed, it is a leaking wheel cylinder condition, and must be replaced using the appropriate repair procedures provided in the Shop Manuals.

c. If no brake fluid leak is observed, reinstall the dust covers and all removed components.

NOTE: Inspect the other drum brake using the above procedure.