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Pinpoint tests of the brake system (Freelander 2)

 
  • Main
  • Freelander
  • Freelander 2
  • Chassis
  • Brake system
  • Pinpoint tests of the brake system
 
        0  
Contents: Pinpoint Test A: Brake Noise ⇩ Pinpoint Test B: Vibration when…⇩ Pinpoint Test C: Pulling under…⇩ Pinpoint Test D: Soft pedal feel ⇩ Pinpoint test E: pedal drops too…⇩ Pinpoint test F: the pedal drops too…⇩ Pinpoint test G: increased force…⇩ Pinpoint test H: brake locking when…⇩ Pinpoint Test I: Brake Grabbing ⇩ Pinpoint Test J: Increased/erratic…⇩ Pinpoint Test K: Slow or incomplete…⇩

Pinpoint Test A: Brake Noise


A1: Inspection of brake pads


Inspect the condition of the front and rear brake pads. Check the pressure adjusting linings for damage. Are the brake pads OK?

Да - GO to A2.
No - If necessary, CLEAN or INSTALL new brake pads. For more information, refer to: Brake Pads (206-03 Front Disc Brake, Removal and Installation) / Brake Pads (206-04 Rear Disc Brake, Removal and Installation). Check that the system is working properly.

A2: Inspection of brake discs


Inspect the brake discs for excessive corrosion, wear, or excessive thickness variation. Is there excessive corrosion, wear, or excessive thickness variation?

Да - If necessary, INSTALL new brake discs and brake pads. For additional information, refer to: Brake Pads (206-03 Front Disc Brake, Removal and Installation) / Brake Disc (206-03 Front Disc Brake, Removal and Installation) / Brake Pads (206-04 Rear Disc Brake, Removal and Installation) / Brake Disc (206-04 Rear Disc Brake, Removal and Installation). CHECK that the system is operating correctly.


No - The car is in good working order.

Pinpoint Test B: Vibration when applying brakes


B1: Road test of the car


Road test the vehicle at speeds between 40-80 km/h without applying the brakes. Is there vibration?

Да - CHECK for NVH (noise, vibration and harshness) parameters (wheel/tyre imbalance, bushing/suspension component wear/damage, etc.). REPEAT road test if necessary.
No - GO to B2.

B2: Check for vibration in the brakes


Road test the vehicle at speeds between 40 and 80 km/h, applying light to medium force to the brake pedal. Is there vibration?

Да - CHECK the brake caliper mounting bolts and wheel hub nuts and TIGHTEN if necessary. CHECK the balance of all wheels and BALANCE if necessary. CHECK the brake discs for excessive wear, runout, excessive thickness variation or cracks. INSTALL new brake discs and brake pads if necessary. GO to B3.
No - The car is in good working order.

Q3: Does the vibration persist when the brakes are applied?


Road test the vehicle at speeds between 40 and 80 km/h, applying light to medium force to the brake pedal. Is there vibration?

Да - CHECK for wear or damage to the steering gear bushings. CHECK for wear or damage to the steering gear ball joints. CHECK for wear or damage to the front wheel bearings, suspension bushings and ball joints. CHECK for wear or damage to the rear wheel bearings, suspension bushings and ball joints. REFER to the appropriate section of the workshop manual and INSTALL new components if necessary.
No - The car is in good working order.



Pinpoint Test C: Pulling under braking


C1: Road test of the car


Road test the vehicle and apply the brakes. Is there any lateral movement/pull?

Да - GO to C2.
No - The car is in good working order.

C2: Checking the condition of the tires/tire pressure


Check your tires for excessive wear or incorrect pressure. Are your tires properly inflated and in good condition?

Да - GO to C3.
No - ADJUST the tire pressure or INSTALL new tires if they are too worn. CHECK that the system is working properly.

C3: Checking the calipers


Check the disc brake caliper pistons and guide pins for binding, leaking or sticking. Are the disc brake caliper pistons and guide pins binding, leaking or sticking?

Да - If necessary, REPAIR the pins or INSTALL new brake calipers. For additional information, refer to: Brake Caliper (206-03 Front Disc Brake, Removal and Installation) / Brake Caliper (206-04 Rear Disc Brake, Removal and Installation). CHECK that the system is operating correctly.
No - GO to C4.

C4: Inspection of brake discs


Check the brake discs for severe damage, excessive thickness variation, or excessive runout. Are there severe damage or excessive runout?

Да - If necessary, INSTALL new brake discs and brake pads. CHECK that the system is working properly.
No - GO to C5.

C5: Inspection of the front hub assembly with wheel bearing


Check the front hub assembly with the wheel bearing. Are the wheel bearings OK?

Да - GO to C6.
No - If necessary, INSTALL new wheel bearings. For additional information, refer to: Front Wheel Bearing (204-01 Front Suspension, Removal and Installation). CHECK that the system operates correctly.



C6: Checking suspension bushings and ball joints


Check all suspension bushings and ball joints. Are the suspension bushings and ball joints OK?

Да - Check and adjust steering geometry For additional information, refer to: Four-Wheel Alignment (204-00 Suspension System - General Information).
No - If necessary, INSTALL new suspension bushings and ball joints. REFER to the appropriate section in the workshop manual.

Pinpoint Test D: Soft pedal feel


D1: Check for a soft pedal feel (with the engine off)


Check for a "hard" feeling in the brake pedal. Is the brake pedal force and pedal travel normal?

Да - The car is in good working order.
No - GO to D2.

D2: Checking the brake pedal return (with the engine off)


Press the brake pedal 10 times and hold it down at the end. Does the brake pedal feel firm on the last press?

Да - GO to D3.
No - BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Pressurized Brake System (206-00 Brake System - General Information, General Procedures).

D3: Checking the brake pedal return (with the engine running)

  • Apply the parking brake and move the gear shift lever to the park/neutral position.
  • Start the engine and allow it to idle.
  • Lightly depress the brake pedal three to four times.
  • Allow 15 seconds for the vacuum to re-establish.
  • Press the brake pedal until it stops moving downward or you feel an increase in resistance to pedal movement.
  • Keep the brake pedal depressed while increasing the engine speed to approximately 2000 rpm.
  • Release the accelerator pedal.

Does the brake pedal move down as the engine speed returns to idle?



Да - GO to D4.
No - MAKE SURE that vacuum is supplied to the brake booster.

D4: Checking the brake fluid level


Check the brake fluid level in the brake hydraulic reservoir. Is the level normal?

Да - BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Pressurized Brake System (206-00 Brake System - General Information, General Procedures). CHECK that the system is operating correctly.
No - CHECK the brake system for leaks and MAKE repairs as necessary. ADD brake fluid and BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Brake System Under Pressure (206-00 Brake System - General Information, General Procedures). CHECK for proper system operation. REPEAT road test if necessary.

Pinpoint test E: pedal drops too quickly


E1: Road test of the car


Road test the vehicle and press the brake pedal. Is the brake pedal force and pedal travel normal?

Да - The car is in good working order.
No - GO to E2.

E2: Create pressure in the system and check the brake pedal travel


With the vehicle stationary, quickly depress the brake pedal (five times). Does the brake pedal travel increase and then remain at the new level?

Да - BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Pressurized Brake System (206-00 Brake System - General Information, General Procedures). CHECK that the system is operating correctly.


No - GO to E3.

E3: Checking the brake system for leaks


Check the brake system for external leaks. For more information, see Checking the Brake Master Cylinder in this section. Are there any leaks?

Да - MAKE the necessary repairs, ADD brake fluid and BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Brake System Under Pressure (206-00 Brake System - General Information, General Procedures). CHECK that the system is operating correctly.
No - The system is fine.

Pinpoint test F: the pedal drops too slowly


F1: Checking the brake system for leaks


Check the brake system for external leaks. For more information, see Checking the Brake Master Cylinder in this section. Are there external leaks in the brake system?

Да - MAKE the necessary repairs. ADD brake fluid and BLEED the brake system. For additional information, refer to: Bleeding the Brake System (206-00 Brake System - General Information, General Procedures) / Bleeding the Brake System Under Pressure (206-00 Brake System - General Information, General Procedures). CHECK that the system is operating correctly.
No - Check for internal leaks in the brake master cylinder, refer to the brake master cylinder component inspection in this section and make the necessary repairs.

Pinpoint test G: increased force when pressing the brake pedal


G1: Checking brake pads


Check the brake pads for wear, dirt, proper installation, damage, and pad type. Any faults found?



Да - INSTALL the brake pads correctly or INSTALL new brake pads if necessary. For additional information, refer to: Brake Pads (206-03 Front Disc Brake, Removal and Installation) / Brake Pads (206-04 Rear Disc Brake, Removal and Installation). CHECK that the system operates correctly. REPEAT the road test.
No - GO to G2.

G2: vacuum check


  • Disconnect the vacuum hose from the brake booster.
  • Connect the vacuum gauge/pressure gauge to the vacuum hose.
  • Warm up the engine to normal operating temperature.
  • Record the vacuum reading.
Is the reading 90 kPa or higher?

Да - GO to G3.
No - FIND and ELIMINATE the cause of insufficient vacuum. CHECK the correct operation of the system.

G3: System inspection

  • Turn off the engine.
  • Disconnect the vacuum hose.
  • Inspect the brake booster, rubber grommet and all vacuum lines for cracks, holes, damaged connections or missing clamps.
  • Press the brake pedal several times to relieve the vacuum in the system. Press the brake pedal and hold it down.
Does the brake pedal move down when the engine starts?

Да - The vacuum system is OK.
No - GO to G4.

G4: Checking the brake booster valve


Check the brake booster valve. For more information, see Checking the Brake Booster in this section. Is the Brake Booster Valve OK?

Да - CHECK the brake booster. For more information, refer to Checking the Brake Booster in this section. If necessary, INSTALL a new brake booster. For more information, refer to: Brake Booster (206-07 Brake Booster, Removal and Installation). CHECK that the system is operating correctly.


No - INSTALL a new brake booster valve. CHECK that the system is operating correctly.

Pinpoint test H: brake locking when the brake pedal is pressed lightly


H1: Checking the brake lock


Road test the car and lightly press the brake pedal. Do the brakes lock up?

Да - GO to H2.
No - The car is in good working order.

H2: Inspection of brake pads


Inspect the brake pads for contamination, proper installation, damage, and pad type. Any faults found?

Да - INSTALL the brake pads correctly or INSTALL new brake pads if necessary. For more information, refer to: Brake Pads (206-03 Front Disc Brake, Removal and Installation) / Brake Pads (206-04 Rear Disc Brake, Removal and Installation). CHECK that the system is operating correctly.
No - GO to H3.

H3: Inspection of brake calipers


Inspect the brake calipers for binding, leaking or seizing. Any problems found?

Да - INSTALL the brake calipers correctly or INSTALL new brake calipers if necessary. For additional information, refer to: Brake Caliper (206-03 Front Disc Brake, Removal and Installation) / Brake Caliper (206-04 Rear Disc Brake, Removal and Installation). CHECK that the system is operating correctly.
No - The car is in good working order.

Pinpoint Test I: Brake Grabbing


I1: Road test of the car


Road test the vehicle and apply the brakes. Do the brakes function properly?

Да - The car is in good working order.
No - GO to I2.

I2: Checking the brake calipers and parking brake cables


Check the front and rear caliper pistons and guide pins for binding, leaking or sticking, and the parking brake cables for binding/sticking. Are the disc brake caliper pistons and guide pins binding, leaking or sticking, or are the parking brake cables sticking/sticking?

Да - REPAIR or, if necessary, INSTALL new components. Check the correct operation of the system. If necessary, road test the vehicle.
No - GO to I3.

I3: Checking the brake booster


Check the alignment and stroke of the brake booster pushrod. Is the pushrod normal?

Да - The car is in good working order.
No - INSTALL a new brake booster. For more information, refer to: Brake Booster (206-07 Brake Booster, Removal and Installation). CHECK that the system is operating correctly.

Pinpoint Test J: Increased/erratic brake pedal travel


J1: Rough road test

  • Perform a road test under rough road conditions.
  • Slowly depress the brake pedal.
Is the brake pedal force and pedal travel normal?

Да - The car is in good working order.
No - GO to J2.

J2: Checking the brake fluid level


Check the brake fluid level in the brake hydraulic reservoir. Is the level normal?

Да - GO to J3.
No - CHECK the brake fluid reservoir seals. For additional information, refer to Checking the Brake Master Cylinder in this section. ADD brake fluid and BLEED the brake system. For additional information, refer to: Brake System Bleeding (206-00 Brake System - General Information, General Procedures) / Bleeding the Brake System Under Pressure (206-00 Brake System - General Information, General Procedures). CHECK for proper system operation. REPEAT road test if necessary.

J3: Brake pedal return test

  • Allow the engine to run in idle mode.
  • Lightly depress the brake pedal three to four times.
  • Allow 15 seconds for the vacuum to re-establish.
  • Press the brake pedal until it stops moving downward or you feel an increase in resistance to pedal movement.
  • Keep the brake pedal depressed while increasing the engine speed to approximately 2000 rpm.
  • Release the accelerator pedal.
Does the brake pedal move down as the engine speed returns to idle?

Да - GO to J4.
No - MAKE SURE that vacuum is supplied to the brake booster.

J4: Checking the front wheel bearings


Check the front wheel bearings as a whole. Do the front wheel bearings have any play?

Да - INSTALL a new front wheel bearing if damaged. For more information, refer to: Front Wheel Bearing (204-01 Front Suspension, Removal and Installation). CHECK that the system operates correctly.
No - CHECK the difference in thickness of the front brake discs.

Pinpoint Test K: Slow or incomplete brake pedal return


K1: Brake pedal return test

  • Allow the engine to idle while applying the brake pedal several times.
  • Pull the brake pedal back with a force of approximately 44.5 N.
  • Release the brake pedal and measure the distance to the floor.
  • Press the brake pedal firmly.
  • Release the brake pedal and measure the distance to the floor. The brake pedal should return to its original position.
Does the brake pedal return to its original position?

Да - The car is in good working order.
No - GO to K2.

K2: Check the brake pedal for sticking


Disconnect the brake booster from the brake pedal. Check the brake pedal for freedom of movement. Does the brake pedal move freely?

Да - INSTALL a new brake booster. For more information, refer to: Brake Booster (206-07 Brake Booster, Removal and Installation). CHECK that the system is operating correctly.
No - REPAIR or INSTALL a new brake pedal. CHECK the system for proper operation.


This article is available at russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian
Article review: Roman Mitrofanov


 

Previous articles
Brake system specifications
Description and operating principle of the brake system
Diagnostics and testing of the brake system
Road test of the brake system

Current article
Pinpoint tests of the brake system

Next articles
Element checks
Bleeding the brake system
Front Disc Brake Specification
Front Disc Brake Description
Operating principle of the front disc brake
Front brake pads
Front brake disc
Front Brake Caliper Support Plate

 
 

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• Brake system — description Discovery 1 (1989-1998)
• Brake system Range Rover 3 (2001-2012)
• Description and operating principle of the brake system Defender 2007+ (2007-2016)

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