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Cable or actuator force moves an operating lever and spreader between the shoes. The linings press against a cylindrical friction surface and convert vehicle roll force into reaction at the backplate anchors.
Unlike hydraulic service brakes, the parking brake must remain applied without fluid pressure. Springs retract the shoes when released, while an adjuster maintains a small running clearance as linings and drum wear.
| Arrangement | Service brake | Parking brake |
|---|---|---|
| Conventional rear drum | Hydraulic wheel cylinder expands shoes. | Mechanical lever expands the same shoes. |
| Disc with drum-in-hat | Caliper and pads clamp outer disc faces. | Separate small shoes act inside disc hat. |
| Caliper-integrated handbrake | Disc pads provide service braking. | Caliper screw/lever applies the pads; no shoes. |
| Electronic drum-in-hat | Outer disc/caliper. | Electric actuator pulls cables or an expander. |
| Transmission brake | Wheel brakes separate. | Drum/disc on driveline; specialist application. |
The curved web and table locate against pads, springs and anchors. Corrosion, distortion or grooved contact points prevent free movement.
A bonded lining provides stable friction cold and hot. Separation, cracking, glazing or contamination makes the shoe unsafe.
One shoe may carry a pivoting cable lever. Pivot position and left/right orientation determine leverage and release.
Holes and formed ends locate return springs, hold-downs and the star-wheel adjuster. Small differences make visually similar shoes incompatible.
| Check | Variation | Why it matters |
|---|---|---|
| Brake layout | Shared drum shoes or separate drum-in-hat set. | Determines whether shoes also provide service braking. |
| Nominal diameter | Arc matched to internal drum surface. | Wrong diameter cannot adjust correctly. |
| Shoe width | Friction-track and backplate clearance. | Controls contact area and location. |
| Axle/brake option | Different rear discs on one model. | Wheel size does not resolve hat diameter. |
| Lever arrangement | Left/right, fitted or transferable. | Cable actuation depends on it. |
| Adjuster thread | Left- and right-hand mechanisms. | Wrong side can de-adjust in use. |
| Hardware | Spring lengths, hold-down pins and clips. | Controls return and retention. |
| Actuation | Manual cable or electronic system. | Service mode and adjustment differ. |
Their enclosure sees road water and salt, but the shoes may move only when parked. Long inactivity lets pivots, adjusters and lining edges corrode. Because normal service braking does not clean the inner drum, rust can build unnoticed.
A small retaining lip inside the disc hat can trap expanded shoes during removal. Retract the adjuster rather than forcing the disc and pulling the lining from its platform.
First ensure shoes, springs, levers and drum surfaces are serviceable. Next set the star-wheel or eccentric to establish correct shoe-to-drum clearance. Operate the mechanism to centre components, then adjust cable or actuator travel only as specified.
Tightening the cable around widely retracted shoes reduces release margin and can cause dragging. Self-adjusting designs still need correct initial assembly and orientation.
| Symptom | Possible shoe-system cause | Other checks |
|---|---|---|
| High lever travel | Excess shoe clearance or worn lining. | Cable stretch, equaliser and lever mechanism. |
| Poor hold on slope | Glazed/contaminated shoes or oversize drum. | Cable force and adjustment. |
| One wheel hot | Dragging shoe, seized lever or wrong spring. | Wheel bearing and service-brake caliper. |
| Scrape while driving | Detached lining or broken hardware. | Disc shield and bearing play. |
| Brake will not release | Frozen cable, corroded pivot or actuator fault. | Control switch and electronic service mode. |
| Disc will not come off | Wear lip catches adjusted shoes. | Retaining screw and hub corrosion. |
| Uneven hold side-to-side | Different adjustment, contamination or cable force. | Test each wheel independently. |
Check lining thickness at the thinnest point and compare with limits. Reject shoes with cracks, missing chunks, heat damage, oil, fluid or grease. Inspect bonding along every edge.
Measure the drum or disc-hat internal diameter, taper and scoring. A worn surface beyond its maximum cannot be corrected by wider shoe adjustment. Check backplate pads, anchors and cable grommets.
Return springs control clearance and prevent shoes following the drum. Heat and corrosion reduce their force. Hold-down pins keep shoes seated against the backplate while allowing sliding.
Use the correct spring kit and positions. Similar-coloured springs can have different length or rate. Do not shorten, stretch or substitute general springs.
Shoe webs slide a small distance across raised pads as the brake applies and releases. Rust grooves at these points can hold a shoe against the drum or prevent it centring. Clean without thinning the backplate and replace a perforated or deeply worn plate.
Apply only the tiny amount of specified high-temperature brake lubricant to metal contact pads, never to lining, drum or rubber. Confirm the fixed anchor is secure and that shoe ends sit squarely; an offset shoe can wear one edge and distort spring loading.
Where an electric actuator pulls cables, use diagnostic service mode before dismantling. The controller may monitor travel, force and current. Forcing the mechanism can damage gears or lose calibration.
After assembly, perform basic setting, bedding or calibration exactly as directed. A warning lamp should be diagnosed rather than cleared repeatedly.
New shoes may contact only part of the drum until their surfaces conform. Follow the specific bedding routine, which may use several brief low-speed applications with cooling between them. Do not hold the brake applied when excessively hot.
Drum-in-hat systems are not emergency service brakes except where the vehicle explicitly provides that function. Aggressive bedding can overheat the small lining and distort the disc hat.
Axle oil, bearing grease and brake fluid soak into porous lining. Cleaning the surface does not restore reliable friction. Repair the seal or wheel cylinder and replace contaminated shoes on the required axle basis.
Keep aerosol lubricant away from the open assembly and clean the drum with approved brake cleaner before fitting.
The parking brake must achieve required efficiency, operate adequately at the wheels and remain secure. Excess travel, imbalance, binding, warning faults or inadequate hold can lead to MOT failure.
Test on suitable brake equipment and a controlled slope only after static checks. Never work beneath a vehicle relying on its parking brake or a jack alone.
Q: What do handbrake shoes do?
A: They expand against a drum surface to hold the stationary vehicle mechanically.
Q: Are they the same as rear brake shoes?
A: Sometimes in a drum brake; drum-in-hat systems use separate parking shoes.
Q: Why is handbrake lever travel high?
A: Shoe clearance, wear, cable stretch or adjustment can be responsible.
Q: Can I adjust only the cable?
A: Set the shoes first; cable adjustment must not hide excessive drum clearance.
Q: Why will the rear disc not come off?
A: A drum wear lip may catch shoes that need retracting through the adjuster.
Q: Should springs be replaced with the shoes?
A: Renew corroded, stretched or specified single-service hardware using the correct kit.
Q: Can contaminated shoes be cleaned?
A: No reliable cleaning restores soaked lining; repair the leak and replace them.
Q: Do electronic handbrakes still use shoes?
A: Some actuate drum-in-hat shoes; others operate the rear calipers directly.
Q: Do new shoes need bedding?
A: Yes, follow the vehicle-specific controlled bedding procedure.
Q: Why is one rear wheel hot?
A: Check dragging shoes, seized cable/lever, adjustment and service-brake faults.
Q: Should shoes be replaced on both sides?
A: Service the axle consistently to maintain balanced holding performance.
Q: Can I use the handbrake to stop the moving car?
A: Only for the emergency method described by the vehicle maker; normal use is stationary holding.
Q: Can worn handbrake shoes fail the MOT?
A: Yes, through inadequate efficiency, imbalance, excessive travel or binding.