Pinpoint Tests

Pinpoint Tests

PINPOINT TEST G874174p1 : BRAKES NOISY

G874174t1 : INSPECT BRAKE PADS
1 Inspect the condition of the front and rear brake pads. Check for damage to any anti-squeal shims.
- Are the brake pads OK?

->Yes
GO to Pinpoint Test G874174t2.

->No
CLEAN or INSTALL new brake pads as required. For additional information, refer to Brake Pads Front Disc Brake Pads
For additional information, refer to Brake Pads Rear Disc Brake Pads Test the system for normal operation.

G874174t2 : INSPECT BRAKE DISCS
1 Inspect the brake discs for excessive corrosion, wear or disc thickness variation.
- Does excessive corrosion, wear or disc thickness variation exist?

->Yes
INSTALL new brake discs and brake pads as required. For additional information, refer to Brake Pads Front Disc Brake Pads
For additional information, refer to Brake Disc Front Disc Brake Disc
For additional information, refer to Brake Pads Rear Disc Brake Pads
For additional information, refer to Brake Disc Rear Brake Disc TEST the system for normal operation.

->No
Vehicle is OK.

PINPOINT TEST G874174p2 : VIBRATION WHEN BRAKES ARE APPLIED

G874174t3 : ROAD TEST VEHICLE
1 Road test the vehicle between 40-80 km/h (25-50 mph) without applying brakes.
- Is the vibration present?

->Yes
TEST for noise vibration and harshness (wheel/tire balance, worn/damaged suspension bushings/components, etc.). REPEAT road test if necessary.

->No
GO to Pinpoint Test G874174t4.

G874174t4 : CHECK FOR BRAKE VIBRATION
1 Road test the vehicle between 40-80 km/h (25-50 mph) with light and medium application on the brake pedal.
- Is a vibration present?

->Yes
CHECK the brake caliper mounting bolts and wheel hub nuts and TIGHTEN as necessary. CHECK the balance of all road wheels and tires and REPAIR as necessary. CHECK the brake discs for excessive wear, runout, thickness variation or cracks. INSTALL new brake discs and brake pads as required.
GO to Pinpoint Test G874174t5.

->No
Vehicle is OK.

G874174t5 : IS VIBRATION STILL PRESENT UNDER BRAKE APPLICATION?
1 Road test the vehicle between 40-80 km/h (25-50 mph) with light and medium application on the brake pedal.
- Is a vibration present?

->Yes
CHECK for wear or failure of steering gear bushings. CHECK for wear or failure of steering gear ball joints. CHECK for wear or failure of front wheel bearings, suspension bushings and ball joints. CHECK for wear or failure of rear wheel bearings, suspension bushings and ball joints. REFER to relevant section in this product and INSTALL new components as required.

->No
Vehicle is OK.

PINPOINT TEST G874174p3 : THE BRAKES PULL OR DRIFT

G874174t6 : ROAD TEST VEHICLE
1 Road test the vehicle and apply the brake pedal.
- Does the vehicle pull or drift?

->Yes
GO to Pinpoint Test G874174t7.

->No
Vehicle is OK.

G874174t7 : INSPECT TIRE CONDITION/PRESSURE
1 Check for excessive tire wear or incorrect pressures.
- Are the tires at the correct pressure and in good condition?

->Yes
GO to Pinpoint Test G874174t8.

->No
ADJUST the tire pressures or INSTALL new tires if excessively worn. TEST the system for normal operation.

G874174t8 : CHECK CALIPERS
1 Check the disc brake caliper pistons and pins for binding, leaking or sticking.
- Do the disc brake caliper pistons and pins bind, leak or stick?

->Yes
RECTIFY sticking pins and INSTALL new brake calipers as required. For additional information, refer to Brake Caliper
For additional information, refer to Brake Caliper Rear Disc Brake Caliper TEST the system for normal operation.

->No
GO to Pinpoint Test G874174t9.

G874174t9 : INSPECT BRAKE DISCS
1 Check the brake discs for excessive damage, thickness variation or runout.
- Does excessive damage or runout exist?

->Yes
INSTALL new brake discs and brake pads as required. TEST the system for normal operation.

->No
GO to Pinpoint Test G874174t10.

G874174t10 : INSPECT THE FRONT HUB AND WHEEL BEARING ASSEMBLY
1 Check the front hub and wheel bearing assembly.
- Are the wheel bearings OK?

->Yes
GO to Pinpoint Test G874174t11.

->No
INSTALL new wheel bearings as required. For additional information, refer to Front Wheel Bearing Front Wheel Bearing TEST the system for normal operation.

G874174t11 : CHECK SUSPENSION BUSHINGS AND BALL JOINTS
1 Check all suspension bushings and ball joints.
- Are the suspension bushings and ball joints OK?

->Yes
Check and adjust steering geometry For additional information, refer to Four-Wheel Alignment

->No
INSTALL new suspension bushings and ball joints as required. REFER to the relevant section in this product.

PINPOINT TEST G874174p4 : THE PEDAL FEELS SPONGY

G874174t13 : CHECK FOR SPONGY PEDAL (ENGINE OFF)
1 Check for a firm brake pedal.
- Is the brake pedal effort and brake pedal travel normal?

->Yes
Vehicle is OK.

->No
GO to Pinpoint Test G874174t14.

G874174t14 : CHECK BRAKE PEDAL RESERVE (ENGINE OFF)
1 Pump the brake pedal 10 times and hold on the final application.
- Does the brake pedal feel firm on final application?

->Yes
GO to Pinpoint Test G874174t15.

->No
BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding

G874174t15 : CHECK BRAKE PEDAL RESERVE (ENGINE ON)
1 Apply Parking Brake and ensure transmission is in park/neutral.
2 Start engine and allow to idle.
3 Apply the brake pedal lightly three or four times.
4 Wait 15 seconds for the vacuum to recover.
5 Push down on the brake pedal until it stops moving downward or an increased resistance to the brake pedal travel occurs.
6 Hold the brake pedal in the applied position while increasing the engine speed to 2000 rpm.
7 Release the accelerator pedal.
- Does the brake pedal move downward as the engine speed returns to idle?

->Yes
GO to Pinpoint Test G874174t16.

->No
CHECK the vacuum to brake booster.

G874174t16 : CHECK BRAKE FLUID LEVEL
1 Check the brake master cylinder reservoir fluid level.
- Is the fluid level OK?

->Yes
BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation.

->No
CHECK for leaking brake system and RECTIFY as necessary. ADD fluid and BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation. REPEAT road test if required.

PINPOINT TEST G874174p5 : THE PEDAL GOES DOWN FAST

G874174t17 : ROAD TEST VEHICLE
1 Road test the vehicle and apply the brake pedal.
- Is the brake pedal effort and brake pedal travel normal?

->Yes
Vehicle is OK.

->No
GO to Pinpoint Test G874174t18.

G874174t18 : PRESSURIZE SYSTEM AND CHECK BRAKE PEDAL TRAVEL
1 With the vehicle stationary pump the brake pedal rapidly (five times).
- Does the brake pedal travel build up and then hold?

->Yes
BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation.

->No
GO to Pinpoint Test G874174t19.

G874174t19 : CHECK FOR BRAKE SYSTEM LEAKS
1 Check for external brake system leaks. For additional information, refer to brake master cylinder component test Component Tests and General Diagnostics.
- Are leaks found?

->Yes
REPAIR as necessary, ADD fluid and BLEED brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation.

->No
System is OK.

PINPOINT TEST G874174p6 : THE PEDAL GOES DOWN SLOWLY

G874174t21 : CHECK FOR BRAKE SYSTEM LEAKS
1 Check for external brake system leaks. For additional information, refer to brake master cylinder component test Component Tests and General Diagnostics.
- Are there any external brake system leaks?

->Yes
REPAIR as necessary. ADD fluid and BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation.

->No
Check for brake master cylinder internal leaks, refer to brake master cylinder component test Component Tests and General Diagnostics, and repair as necessary.

PINPOINT TEST G874174p7 : EXCESSIVE BRAKE PEDAL EFFORT

G874174t23 : CHECK BRAKE PADS
1 Check the brake pads for wear, contamination, correct installation, damage and type.
- Are any concerns found?

->Yes
INSTALL brake pads correctly or INSTALL new brake pads as required. For additional information, refer to Brake Pads Front Disc Brake Pads
For additional information, refer to Brake Pads Rear Disc Brake Pads TEST the system for normal operation. REPEAT road test.

->No
GO to Pinpoint Test G874174t24.

G874174t24 : CHECK VACUUM
1 Disconnect the vacuum hose from the brake booster.
2 Connect a vacuum/pressure tester to the vacuum hose.
3 Run the engine at normal operating temperature.
4 Record the vacuum reading.
- Is the reading 90 kPa (26.5 in-Hg) or greater

->Yes
GO to Pinpoint Test G874174t25.

->No
LOCATE and REPAIR the source of low vacuum. TEST the system for normal operation.

G874174t25 : INSPECT SYSTEM
1 Switch the engine off.
2 Reconnect the vacuum hose.
3 Inspect the brake booster, rubber grommet, and all vacuum plumbing for cracks, holes, damaged connections, or missing clamps.
4 Pump the brake pedal several times to exhaust the vacuum. Push down on the brake pedal and hold.
- Does the brake pedal move down when the engine is started?

->Yes
Vacuum system is OK.

->No
GO to Pinpoint Test G874174t26.

G874174t26 : CHECK POWER BRAKE BOOSTER VALVE
1 Check the brake booster valve. For additional information, refer to Brake Booster component test Component Tests and General Diagnostics.
- Is the power brake booster valve OK?

->Yes
CHECK the brake booster. For additional information, refer to Brake Booster component test Component Tests and General Diagnostics. INSTALL a new brake booster as required. For additional information, refer to Brake Booster Service and Repair TEST the system for normal operation.

->No
INSTALL a new brake booster valve. TEST the system for normal operation.

PINPOINT TEST G874174p8 : BRAKE LOCKUP DURING LIGHT BRAKE PEDAL FORCE

G874174t27 : TEST BRAKE LOCKUP
1 Road test the vehicle and apply the brake pedal lightly.
- Do the brakes lockup?

->Yes
GO to Pinpoint Test G874174t28.

->No
Vehicle is OK.

G874174t28 : INSPECT BRAKE PADS
1 Inspect brake pads for contamination, correct installation, damage and type.
- Are any concerns found?

->Yes
INSTALL the brake pads correctly or INSTALL new brake pads as required. For additional information, refer to Brake Pads Front Disc Brake Pads
For additional information, refer to Brake Pads Rear Disc Brake Pads TEST the system for correct operation.

->No
GO to Pinpoint Test G874174t29.

G874174t29 : INSPECT BRAKE CALIPERS
1 Inspect brake calipers for binding, leaking or sticking.
- Are any concerns found?

->Yes
INSTALL the brake calipers correctly or INSTALL new brake calipers as required. For additional information, refer to Brake Caliper
For additional information, refer to Brake Caliper Rear Disc Brake Caliper TEST the system for normal operation.

->No
Vehicle is OK.

PINPOINT TEST G874174p9 : BRAKES DRAG

G874174t30 : ROAD TEST VEHICLE
1 Road test the vehicle and apply the brakes.
- Are the brakes functioning correctly?

->Yes
Vehicle is OK.

->No
GO to Pinpoint Test G874174t31.

G874174t31 : CHECK BRAKE CALIPERS AND PARKING BRAKE CABLES
1 Check the front and rear caliper pistons and pins for binding, leaking or sticking and parking brake cables for sticking/binding.
- Do the disc brake caliper pistons and pins bind, leak or stick, or the parking brake cables stick/bind?

->Yes
REPAIR or INSTALL new components as required. Test the system for normal operation. Road test vehicle if necessary.

->No
GO to Pinpoint Test G874174t32.

G874174t32 : CHECK BRAKE BOOSTER
1 Check the brake booster connecting rod alignment and travel.
- Is the connecting rod OK?

->Yes
Vehicle is OK.

->No
INSTALL a new brake booster. For additional information, refer to Brake Booster Service and Repair TEST the system for normal operation.

PINPOINT TEST G874174p10 : EXCESSIVE/ERRATIC BRAKE PEDAL TRAVEL

G874174t33 : TEST ON ROUGH ROAD
1 Road test the vehicle on rough road conditions.
2 Apply the brakes slowly.
- Is the brake pedal effort and brake pedal travel normal?

->Yes
Vehicle is OK.

->No
GO to Pinpoint Test G874174t34.

G874174t34 : CHECK BRAKE FLUID LEVEL
1 Check the brake master cylinder reservoir fluid level.
- Is the fluid level OK?

->Yes
GO to Pinpoint Test G874174t35.

->No
CHECK brake master cylinder reservoir sealing points. For additional information, refer to Brake master cylinder component test Component Tests and General Diagnostics. ADD brake fluid and BLEED the brake system. For additional information, refer to Brake System Bleeding Service and Repair
For additional information, refer to Brake System Pressure Bleeding TEST the system for normal operation. REPEAT road test if necessary.

G874174t35 : CHECK BRAKE PEDAL RESERVE
1 Run engine at idle speed.
2 Apply the brake pedal lightly three or four times.
3 Wait 15 seconds for the vacuum to replenish.
4 Push down on the brake pedal until it stops moving downward or an increased resistance to the brake pedal travel occurs.
5 Hold the brake pedal in the applied position while increasing the engine speed to 2000 rpm.
6 Release the accelerator pedal.
- Does the brake pedal move downward as the engine speed returns to idle?

->Yes
GO to Pinpoint Test G874174t36.

->No
CHECK the vacuum to the brake booster.

G874174t36 : CHECK THE FRONT WHEEL BEARING ASSEMBLY
1 Check the front wheel bearing assembly.
- Are the front wheel bearings loose?

->Yes
INSTALL a new front wheel bearing if damaged. For additional information, refer to Front Wheel Bearing Front Wheel Bearing TEST the system for normal operation.

->No
CHECK the front brake discs for thickness variances.

PINPOINT TEST G874174p11 : SLOW OR INCOMPLETE BRAKE PEDAL RETURN

G874174t37 : CHECK FOR BRAKE PEDAL RETURN
1 Run the engine at idle while making several brake applications.
2 Pull the brake pedal rearward with approximately 44.5 N (10lb) force.
3 Release the brake pedal and measure the distance to the toe board.
4 Make a hard brake application.
5 Release the brake pedal and measure the brake pedal to toe board distance. The brake pedal should return to its original position.
- Does the brake pedal return to its original position?

->Yes
Vehicle is OK.

->No
GO to Pinpoint Test G874174t38.

G874174t38 : CHECK FOR BRAKE PEDAL BINDING
1 Disconnect the brake booster from the brake pedal. Check the brake pedal to ensure free operation.
- Is the brake pedal operating freely?

->Yes
INSTALL a new brake booster. For additional information, refer to Brake Booster Service and Repair TEST the system for normal operation.

->No
REPAIR or INSTALL new brake pedal. TEST the system for normal operation.