Honda HR-V: Description, Testing

DESCRIPTION

BRAKE SYSTEM DESCRIPTION - OVERVIEW

TESTING

BRAKE BOOSTER TEST

Test

1. Brake Booster Functional - Test

1. Turn the vehicle to the OFF (LOCK) mode, press the brake pedal several times to deplete the vacuum reservoir, then press the brake pedal hard and hold it for 15 seconds. If the brake pedal sinks, either the master cylinder is bypassing internally or the brake system is leaking. Inspect the brake hoses and lines.
2. Start the engine with the brake pedal pressed. If the brake pedal sinks slightly, the vacuum booster is operating normally. If the brake pedal height does not change, do the brake system test.

2. Brake Booster Leak - Test

1. Press the brake pedal with the engine running, then turn the vehicle to the OFF (LOCK) mode. The brake pedal height should not change while pressed for 30 seconds.
   • If the pedal height rises, go to step 6.
   • If it does not rise, go to step 2.
2. Start the engine, and let it idle for 30 seconds. Turn the vehicle to the OFF (LOCK) mode, and wait 30 seconds. Press the brake pedal several times using normal pressure.

   When the pedal is first pressed, it should be low. On consecutive applications, the pedal height should gradually rise.

   • If it rises, the booster is OK.
   • If it does not rise, go to step 3.
3. Disconnect the brake booster vacuum hose (A) at the booster. The check valve (B) is built into the hose.

   NOTE : If the check valve is faulty, replace the brake booster vacuum hose and the check valve as an assembly

4. Start the engine, and let it idle. There should be vacuum available.
   • If no vacuum is available, the check valve is not working properly. Replace the brake booster vacuum hose and the check valve as an assembly, and retest.
   • If vacuum is found, go to step 5.
5. Turn the vehicle to the OFF (LOCK) mode, reconnect the vacuum hose to the brake booster
6. Start the engine, and then pinch the brake booster vacuum hose between the check valve and the booster
7. Turn the vehicle to the OFF (LOCK) mode, and wait 30 seconds. Press the brake pedal several times using normal pressure. When the pedal is first pressed, it should be low. On consecutive applications, the pedal height should gradually rise.
   • If the pedal position does not change, inspect the seal between the master cylinder and the booster. If the seal is OK, replace the brake booster.
   • If the pedal position changes, replace the brake booster vacuum hose and the check valve as an assembly.

BRAKE FLUID LEVEL SWITCH TEST

Test

NOTE: If both the ABS/VSA indicator and the brake system indicator (red) come on at the same time, check the VSA system for DTCs first.

1. Brake Fluid Level Switch - Test

1. Disconnect the brake fluid level switch connector
2. Check for continuity between the terminals (1) and (2) with the float in the down position and in the up position.
   • Remove the brake fluid completely from the reservoir. With the float down, there should be continuity.
   • Fill the reservoir with brake fluid to the MAX (upper) level (A). With the float up, there should be no continuity.

   NOTE: If the parking brake switch and the brake fluid level switch are OK, but the brake system indicator (red) does not function, do the gauge control module self-diagnostic function.

3. Connect the brake fluid level switch connector.

BRAKE SYSTEM INSPECTION AND TEST

Inspection

1. Brake System - Inspect

Inspect the brake system components listed. Repair or replace any parts that are leaking or damaged.

Component Inspections:

1. Brake System - Test

Brake pedal sinks/fades when braking

1. Set the parking brake, and start the engine, then turn off the A/C. Allow the engine to warm up to normal operating temperature (radiator fan comes on twice)
2. Make sure the steering column lock lever is in the locked position. Attach a 50 mm (1.97 in) piece of masking tape along the bottom of the steering wheel, and draw a horizontal reference mark across it
3. With the transmission in neutral (M/T) or P or N (CVT), press and hold the brake pedal lightly (about the same pressure needed to keep an A/T-equipped vehicle from creeping), then release the parking brake
4. While still holding the brake pedal, hook the end of the tape measure behind the brake pedal, then pull the tape up to the steering wheel. Note the measurement between the brake pedal and the reference mark on the steering wheel
5. Apply steady pressure to the brake pedal for 3 minutes
6. Watch the tape measure.
   • If the measurement increases 10 mm (0.39 in) or less, the master cylinder is OK.
   • If the measurement increases more than 10 mm (0.39 in), replace the master cylinder.

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