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What a brake caliper does
A disc-brake caliper changes hydraulic pressure into mechanical clamping force. Pressing the brake pedal moves fluid through the hydraulic circuit. The caliper piston then pushes a pad against the rotating disc; the caliper body and its mounting arrangement bring the opposite pad into contact. Friction slows the wheel and converts the vehicle's movement into heat.
The caliper is only one part of the corner. Pads, disc, carrier, slide hardware, hose, brake fluid, hub and wheel bearing all affect the result. Electronic systems can change hydraulic pressure, but they cannot compensate for a leaking seal, seized piston, loose mounting or badly damaged friction surface.
How braking force reaches the wheel
- The driver applies the pedal and the assisted hydraulic system builds pressure.
- Brake fluid carries that pressure through rigid pipes and the flexible hose.
- The piston moves out of its bore and loads the inner pad.
- On a sliding or floating arrangement, the caliper moves on its guides so the outer pad also contacts the disc.
- Pad-to-disc friction creates braking torque at the wheel.
- Releasing the pedal removes pressure; seal elasticity and free guide movement allow the pads to relax away from the disc.
- ABS or stability control may briefly alter pressure when wheel-speed and other sensor data show that intervention is needed.
Reliable release is as important as application. A piston or guide that does not return can leave the brake dragging, causing heat, uneven wear and extra fuel use. A hose can also fail internally and act like a one-way restriction, so a hot wheel does not prove the caliper alone is at fault.
Application details for this Freelander 2 Van
These listings relate to the Land Rover Freelander 2 Van (L359) 2.2 TD4 4x4 with 160 hp and 2,179 cc, recorded from October 2006 to October 2014. The live matching data contains rear-left and rear-right choices and includes a VIN split. Treat every dimension below as a confirmation point from the individual matching entries, not as permission to ignore the full restriction on the selected product.
| Application detail | What the matching entries show | What to verify on the vehicle and listing |
|---|---|---|
| Fitting position | Rear axle, left or right | Choose the correct side and confirm bleed-screw orientation. |
| Caliper description | Single-piston hydraulic caliper | Match the complete brake-system and mounting description. |
| Piston diameter | 36 mm is stated on the current matching entries | Do not use diameter alone; confirm reference and VIN restriction. |
| Rear disc | Solid disc; 12 mm thickness is stated | Measure the installed disc and assess wear against its own limits. |
| Later matching references | 302 mm disc diameter and 145 mm mounting-hole spacing are stated | These details accompany a later VIN split and are not universal shortcuts. |
| Material | Grey cast iron is stated | Check coating, condition, included hardware and handling instructions. |
The vehicle's 4x4 description does not replace the brake-system checks. VIN, side, disc size, production change, original reference and the hardware actually fitted should agree. A previous axle, hub or brake conversion can make the installed arrangement different from the original record.
Caliper designs and why they are not interchangeable
| Design | How it applies the pads | Service considerations |
|---|---|---|
| Sliding or floating caliper | Piston force on one side is balanced by movement across guide pins. | Guide freedom, boots, lubrication points and carrier condition are critical. |
| Fixed caliper | Opposed pistons act from a rigid body on both sides of the disc. | More pistons and seals increase the number of bores and bleed points to assess. |
| Rear caliper with integrated parking mechanism | A mechanical or motor-driven mechanism acts through the caliper. | Correct service mode and retraction method are essential where this design is fitted. |
| Separate parking-brake mechanism | The hydraulic caliper and parking brake act through separate hardware. | Do not assume a parking-brake fault proves the hydraulic caliper is defective. |
The exact matching product descriptions on this page identify single-piston rear hydraulic calipers. The Freelander 2 handbook also includes an electronic parking brake, but related parking-brake work must follow the vehicle-specific mechanism and procedure. Do not force a piston, cable or actuator using instructions for a different design.
Performance depends on the complete brake corner
Clamping force depends on hydraulic pressure, piston area, caliper stiffness and free movement. Actual stopping performance also depends on pad friction, disc condition, tyre grip, vehicle load, temperature and the balance between wheels. A sound replacement caliper cannot correct an oil-contaminated pad, badly corroded inner disc face, restricted hose or loose wheel bearing.
- Both pads must move and contact the disc evenly.
- The carrier and guide surfaces must be sound and correctly lubricated only where specified.
- The flexible hose must not be twisted, chafed or internally restricted.
- The disc must be within its thickness and run-out limits.
- The hub, bearing, wheel and tyre must be secure and serviceable.
- Brake fluid must meet the stated specification and be kept free from dirt, oil and moisture.
Electronic systems related to caliper operation
ABS monitors wheel speed and can modulate pressure to help prevent lock-up. Electronic brake-force distribution adjusts how braking effort is managed, while emergency brake assist can support rapid pedal applications. Dynamic stability and hill-descent functions may request individual-wheel braking. These features depend on accurate sensor data and a healthy hydraulic system.
A brake, ABS, stability, hill-descent or parking-brake warning should be diagnosed from the whole vehicle. Save codes and operating data before clearing them. Low battery voltage, damaged wheel-speed wiring or a bearing encoder fault can create messages that do not require a caliper. Conversely, the absence of a warning does not make a seized or leaking caliper safe.
How caliper construction has developed
Early disc-brake calipers were mainly hydraulic mechanical assemblies. Modern vehicles retain the same pressure-to-clamp principle but integrate it with ABS, stability control, hill-descent functions, brake wear monitoring and electronic parking systems. Materials, protective coatings, seal design and manufacturing tolerances have also developed to reduce mass, corrosion and drag.
Remanufactured calipers can be a valid engineering route when the casing is suitable and the unit has been correctly stripped, inspected and rebuilt to a defined specification. New and remanufactured parts should still be checked for the same application, side, hydraulic connection, bleed position and included hardware. “New” or “remanufactured” is not a fitment specification.
Core components to inspect
Body, piston and bore
The body resists hydraulic and mounting loads. The piston must move smoothly without excessive corrosion or damage, while the bore and seal groove must retain pressure. Heavy corrosion, a cracked body or damage around the hose and bleed threads can make the unit unsuitable for repair.
Pressure seal and dust boot
The hydraulic seal contains fluid and helps the piston relax when pressure falls. The outer boot keeps water and grit away from the working surface. A torn boot can allow corrosion to start before a visible fluid leak appears. Fluid on the pad or disc requires the contamination source to be corrected and affected friction parts assessed.
Carrier, guides and boots
On a sliding arrangement, guide pins allow the caliper to centre its force. The correct pin, bush, boot and specified lubricant are important. General-purpose grease can attack rubber or migrate to friction surfaces; excess lubricant can also trap a pin hydraulically.
Bleed screw and hose connection
The bleed point must be at the top of the fluid chamber during bleeding. A caliper installed on the wrong side may place it too low and retain air. Hose threads, sealing faces, brackets and banjo hardware must match the unit. Do not let the caliper hang from the flexible hose.
Pads, shims and contact points
Pads must be the correct shape and move freely without being loose. Inspect abutment surfaces, clips, shims and any wear indicator. Lubricant belongs only on points identified by the repair procedure, never on the pad friction material or disc.
Wear and inspection guide
| Item | Check | What a problem can cause |
|---|---|---|
| Piston and boot | Leakage, corrosion, tears and smooth controlled movement | Fluid loss, sticking, drag or uneven pad wear |
| Guide pins and carrier | Free movement, play, boot condition and corrosion | One pad wearing faster, pull or poor release |
| Flexible hose | Cracks, bulges, twists, chafing and internal restriction | Leakage, delayed application or pressure trapped at the caliper |
| Disc | Both faces, thickness, scoring, cracks, corrosion and run-out | Vibration, noise, reduced friction or pad taper |
| Pads | Thickness, taper, glazing, cracking and contamination | Reduced performance, noise or imbalance |
| Hub and bearing | Play, roughness, run-out and encoder condition | Disc movement, noise and ABS faults |
| Mountings | Correct fasteners, threads, security and prescribed torque | Movement, noise or dangerous detachment |
Materials, coatings and replacement choices
| Choice | Useful property | Check before fitting |
|---|---|---|
| Grey cast-iron body | High stiffness and established wear and heat behaviour | Corrosion protection, mass, threads and exact application |
| Aluminium body | Lower mass in applications designed for it | Do not substitute for cast iron unless the vehicle application specifies it. |
| Protective coating | Can slow external corrosion | Coating must not obstruct sliding, sealing or mounting surfaces. |
| New caliper | New body and internal components | Side, references, included carrier, hose fitting and bleed position |
| Remanufactured caliper | Reuses a serviceable casing after controlled rebuilding | Rebuild standard, return conditions, application and supplied hardware |
| Repair kit | Can restore a suitable unit with serviceable hard parts | Do not rebuild a cracked, badly corroded or dimensionally damaged body. |
Brake fluid and workshop cleanliness
Use the brake-fluid specification stated for the vehicle and current repair information. Fluid grade, low-temperature behaviour and compatibility matter; colour is not an approval. Keep new fluid sealed until use, clean the reservoir area before opening it and prevent mineral oil, grease, water or dirt from entering the hydraulic circuit.
| Task | Good practice | Risk if ignored |
|---|---|---|
| Opening the circuit | Clean first, protect paint and cap open connections | Contamination, moisture entry and fluid damage |
| Hose removal | Use the correct tool and support the hose without twisting | Damaged union, internal hose failure or leakage |
| Bleeding | Follow the stated sequence and diagnostic procedure where required | Retained air, long pedal or hydraulic-control faults |
| Fluid selection | Match the exact stated specification | Seal incompatibility or unsuitable boiling and cold-flow performance |
| Final level | Set correctly after pads and pistons are in their normal positions | Low level, overfill or misleading warning |
Never reuse bled fluid. Do not allow the reservoir to run dry. If air has entered an ABS hydraulic unit, the repair procedure may require diagnostic actuation as well as conventional bleeding. A firm pedal in the workshop is not the only check; inspect every opened connection under pressure and confirm balanced operation.
Heat, operating conditions and brake drag
Every stop turns energy into heat. Vehicle load, speed, repeated braking and hill-descent use raise the thermal demand. A dragging rear caliper continues producing heat after the pedal is released and can damage the pad, disc, seal, bearing and tyre. Heat can also boil degraded or moisture-contaminated fluid, reducing pedal effectiveness.
| Condition | Effect | Response |
|---|---|---|
| Normal urban braking | Repeated moderate heat cycles | Inspect wear and free movement at service intervals. |
| Heavy load or long descent | Higher disc, pad and fluid temperatures | Use appropriate driving technique and investigate fade or warning messages. |
| Seized piston or guide | Continuous heat at one wheel | Stop if temperature is rising; diagnose before further driving. |
| Mud, water or road salt | Corrosion, trapped debris and reduced movement | Inspect hidden surfaces, boots, guides and parking-brake hardware. |
| Contaminated friction surface | Lower or unpredictable friction | Correct the leak and assess pads and disc; cleaning alone may be insufficient. |
Fault symptoms and urgency
| Symptom | Possible causes | Urgency |
|---|---|---|
| Fluid around the caliper or hose joint | Seal, body, bleed screw, hose or union leak | Do not drive with an active hydraulic leak. |
| Vehicle pulls under braking | Caliper, hose, pad, disc, tyre, suspension or hydraulic imbalance | Prompt diagnosis; stop if control or braking is materially affected. |
| One wheel unusually hot | Sticking piston, guide, hose restriction, parking brake or bearing | Stop before heat damages the tyre, bearing or friction parts. |
| Long or soft pedal | Air, leak, fluid problem, flexible hose or hydraulic fault | Do not continue if normal braking cannot be assured. |
| Tapered or unequal pad wear | Guide, carrier, piston, disc or mounting problem | Repair the cause before fitting another pad set. |
| ABS or parking-brake warning | Sensor, wiring, voltage, control or related mechanical fault | Read fault information promptly; do not assume the caliper is the cause. |
| Grinding or metal contact | Worn pad, damaged disc or loose component | Stop and inspect; continued use can sharply reduce braking. |
Replacement and repair workflow
- Confirm the exact vehicle, VIN, axle and side.
- Measure the fitted disc and compare the original caliper and reference.
- Record the pedal complaint, temperatures, pad wear and diagnostic faults.
- Secure the vehicle on rated supports and prevent unexpected movement.
- Protect the hydraulic circuit from dirt and do not strain the flexible hose.
- Inspect the carrier, disc, pads, hose, hub and opposite side of the axle.
- Fit the correct seals, fasteners and hardware using the stated torque procedure.
- Bleed with the approved fluid and carry out any required diagnostic routine.
- Apply the brake pedal before moving the vehicle and check every connection for leaks.
- Verify free rotation, warning lamps, balanced braking and parking-brake operation in controlled conditions.
Whether both calipers should be renewed depends on condition and diagnosis; there is no automatic rule that a sound opposite caliper must always be replaced. Pads and discs, however, must maintain suitable axle balance and are commonly serviced as axle sets. If one side has overheated, inspect the corresponding parts on both sides before deciding the repair scope.
Common mistakes to avoid
- Ordering by model name or photograph without checking the VIN split.
- Confusing rear left with rear right or placing the bleed screw too low.
- Using piston diameter or disc size as the only fitment check.
- Assuming the caliper is faulty when a hose or parking-brake mechanism is holding pressure.
- Letting the caliper hang from the hose.
- Using general grease on seals, pins or friction surfaces.
- Forcing a piston without confirming the correct retraction procedure.
- Reusing contaminated pads after a fluid leak.
- Skipping the inner disc face, carrier and wheel-bearing inspection.
- Driving before the pedal has been restored and leak checks are complete.
Upgrades, modifications and UK road use
A larger or visually different caliper is not automatically an upgrade. Piston area, master-cylinder relationship, disc diameter and thickness, wheel clearance, front-to-rear balance, ABS calibration, hose routing and thermal capacity all have to work together. Cosmetic coatings must be heat suitable and kept away from seals, sliding surfaces, threads and bleed points.
For UK road use, modifications must remain safe, securely mounted and compatible with the complete braking system. Check wheel clearance through the full range of steering and suspension movement, retain suitable hoses and approved friction parts, and notify the insurer where required. Competition hardware is not automatically legal or appropriate for road use.
MOT and safety notes
The MOT assesses defined aspects of brake condition, operation and performance. Significant binding, inadequate effort, serious imbalance, an insecure component, unsafe modification, relevant warning-lamp fault or hydraulic leak can result in failure; the most serious loss of braking can be classed as dangerous. The electronic parking brake and ABS warning functions are also within the inspection where applicable.
An MOT pass is not a brake service or a fitment certificate. It does not prove that a caliper reference is correct, that the fluid is within the intended maintenance condition or that hidden inner surfaces will remain sound until the next test. Keep the vehicle roadworthy between tests and arrange immediate recovery rather than driving when an active leak, severe drag or materially reduced braking is present.
Freelander 2 Van brake caliper FAQs
Q: Are these calipers for the exact 160 hp Freelander 2 Van?
A: Yes, the page is scoped to the Van (L359) 2.2 TD4 4x4 160 hp application, but every VIN and product restriction must still be checked.
Q: Does left or right matter for a rear brake caliper?
A: Yes. Choose the stated side and make sure the bleed screw will sit at the top of the fluid chamber.
Q: Why is there a VIN split in the matching calipers?
A: The brake application changed during production, so compare the full VIN restriction and installed hardware.
Q: Is a 36 mm piston enough to confirm fitment?
A: No. Also confirm side, brake-system details, disc dimensions, mounting spacing, references and VIN range.
Q: Can a hot rear wheel be caused by something other than the caliper?
A: Yes. A restricted hose, parking-brake fault, wheel bearing or friction problem can produce similar heat.
Q: Should brake calipers always be replaced in pairs?
A: Not automatically. Diagnose both sides, but keep pads, discs and braking performance balanced across the axle.
Q: Can old pads be reused after a caliper leak?
A: Pads contaminated by brake fluid should not be returned to service; inspect the disc and opposite side as well.
Q: Does the electronic parking brake mean the hydraulic caliper has a motor?
A: Not necessarily. Follow the Freelander 2 procedure for the fitted parking-brake mechanism instead of assuming its design.
Q: Why is the pedal soft after caliper replacement?
A: Possible causes include retained air, a leak, an incorrect bleed sequence or a hydraulic-control unit that needs a diagnostic routine.
Q: Which brake fluid should be used?
A: Use new sealed fluid that meets the exact vehicle specification; colour or broad universal wording is not enough.
Q: Can I drive with a sticking caliper for a short distance?
A: No if braking is reduced or heat is building. Drag can damage the disc, bearing and tyre and may worsen quickly.
Q: Will a seized caliper always switch on a warning light?
A: No. Mechanical drag or uneven wear can exist without an electronic warning.
Q: Does an MOT pass confirm the calipers are correctly matched?
A: No. The MOT checks roadworthiness items and brake performance, not every part reference or maintenance detail.
Q: What should be checked before the vehicle moves after repair?
A: Restore a firm pedal, inspect for leaks, confirm free rotation and warning-lamp status, then test braking safely in controlled conditions.