Begin by locating the self-adjuster mechanism near the lower brake shoe–this component requires periodic tensioning to maintain optimal clearance. The star wheel, positioned between the shoes, must rotate freely; corrosion or dirt accumulation here causes uneven wear and reduced stopping power. Apply a light coating of silicone-based lubricant to the contact points, avoiding excess that could migrate onto friction surfaces.
Inspect the wheel cylinder for external leakage–brake fluid seepage indicates seal failure, mandating immediate replacement. Remove the brake drum cautiously; persistent rust may fuse it to the hub. Use a rust penetrant and tap evenly with a plastic mallet to avoid damaging the flange. Measure drum internal diameter; Ford specifies a maximum wear limit of 9.15 inches–exceeding this threshold compromises integrity and heat dissipation.
Evaluate shoe thickness–minimum acceptable material depth is 0.040 inches. Replace pairs even if one shoe remains marginally above spec; uneven friction leads to erratic braking. Note the parking brake linkage engagement: the cable should retract fully when released. Adjust cable tension at the equalizer if slack exists to prevent drag-induced premature wear.
Reassembly demands precise alignment of return springs–install the upper spring first, followed by lower and side springs. Verify the pivot points of the brake shoes; misalignment causes erratic self-adjustment or squealing. Torque the wheel lugs to 85 ft-lbs in a cross-pattern for uniform hub contact. Post-installation, pump the pedal three times before road testing to seat the shoes and restore hydraulic pressure.
Understanding the LX Coupe’s Hydraulic Stop Mechanism
Always begin servicing by releasing pressure in the hydraulic system: locate the bleed nipple on the wheel cylinder, attach a clear tube, and drain fluid until no air bubbles appear. Failure to purge air first risks spongy pedal feel and inconsistent stopping power.
Inspect the backing plate for corrosion or rust buildup–especially around rivet holes and shoe contact points. Use a wire brush and rust converter to treat affected areas; untreated corrosion causes premature shoe wear and potential brake drag.
Critical Component Specifications
| Part | Measurement | Wear Limit | Torque Spec |
|---|---|---|---|
| Brake Shoe Lining | 5.0 mm | 1.0 mm | N/A |
| Wheel Cylinder Bore | 22.22 mm | 22.30 mm | N/A |
| Brake Drum Diameter | 228.6 mm | 229.5 mm | N/A |
| Wheel Cylinder Bolts | N/A | N/A | 12-15 Nm |
| Hub Nut | N/A | N/A | 180-220 Nm |
Avoid using compressed air to clean components–fine dust particles contaminate wheel bearings and ABS sensors. Use a brake-safe cleaner and shop vacuum instead. Always replace brake hardware kits when installing new shoes; springs and retainers lose tension over time.
Adjust parking brake cables after shoe installation: tension should be set so the lever clicks 4-6 times before full engagement. Over-tightening causes premature cable stretch and reduced effectiveness, while loose cables fail to hold the vehicle on grades.
When measuring drum diameter, use a micrometer at four points around the circumference. Uneven wear indicates bearing issues or misaligned shoes–address these before proceeding. Surface scoring deeper than 0.5 mm requires drum resurfacing or replacement.
Apply high-temperature silicone-based lubricant sparingly to shoe contact points–never use petroleum-based products. Coat backing plate ledges, self-adjuster mechanisms, and anchor pins to prevent squeaking and ensure smooth operation. Avoid over-application, which attracts dust and debris.
Troubleshooting Common Issues
Pulsating pedal often stems from uneven drum thickness rather than rotor warpage–measure both drums and replace in pairs if variance exceeds 0.1 mm. Spongy pedal usually indicates air in the system; bleed starting from the farthest wheel and move inward. Grinding noises typically signal metal-to-metal contact–stop driving immediately and inspect for worn linings or damaged springs.
Critical Elements of the LX Coupe’s Hydraulic Stop Mechanism
Inspect the wheel cylinder every 12,000 miles–corrosion on the pistons (measured at 23.8 mm diameter) triggers uneven pad wear or hydraulic failure. Replace seals if leakage exceeds 3 drops per minute under 1,500 psi pressure testing. Match replacement cylinders to OEM part #E9ZY-2A202-BA for 1992-1995 models; aftermarket units often lack chromate coating, accelerating rust in humid climates.
- Brake shoes: Secondary lining (outer) should be 5 mm thick at minimum; primary (inner) 4 mm. Use ceramic compound pads (Girling C60) for 30% longer life in urban driving versus organic linings.
- Adjusting mechanism: Star wheel adjuster (thread pitch 0.8 mm) must turn smoothly–apply silicon-based grease sparingly; petroleum jelly swells rubber boots, causing drag.
- Backing plate: Check anchor pins (torque to 30-35 Nm) and springs (replace if tension drops below 2.1 kg for return springs). Misalignment here reduces self-adjust efficiency by 40%.
- Parking brake cable: Inner cable diameter 1.8 mm; replace if fraying exceeds 10% circumference. Outer housing should slide freely–lubricate with dry PTFE spray only to avoid attracting road grit.
How to Decode Your Vehicle’s Wheel Assembly Blueprint
Begin by locating the adjuster mechanism on the left side of the illustration. It appears as a slotted wheel connected to a threaded shaft–this component extends when turned clockwise, tightening shoe-to-drum clearance. Identify its placement relative to the backing plate: it sits between the primary and secondary shoes, near the lower anchor pin. Verify its orientation; the slot should face outward for accessibility during maintenance.
Trace the hydraulic circuit next. Highlight the wheel cylinder–recognizable by its dual pistons–and follow the brake lines feeding into it. These lines split from a single feed pipe, which originates at the master cylinder. Check for color-coding in the blueprint: red typically denotes pressure lines, while blue or black indicate return or low-pressure paths. Cross-reference this with your vehicle’s service manual to confirm routing errors aren’t mislabeled.
- Primary Shoe: Positioned toward the front of the assembly, this lining contacts the drum first during braking. Measure its thickness against specifications–typically 5 mm minimum–before planning replacement.
- Secondary Shoe: Opposite the primary, it engages after the initial contact. Note the self-adjuster cable running from its upper anchor to the adjuster lever; this cable must sit tensioned but not taut to prevent premature wear.
- Return Springs: Two types–upper (hooked between shoes) and lower (secured to the anchor pin). The blueprint marks their exact coil count; deviations hint at incorrect spring rates.
Examine the anchor pin at the assembly’s base. It secures both shoes and serves as the pivot point for rotational movement. Confirm its diameter–the LX variant uses an 8 mm pin–and inspect the retaining clip’s placement. A missing or damaged clip allows shoes to shift, causing uneven braking or noise. Compare the pin’s position to the parking brake lever; they share a mounting point, so misalignment here affects both systems.
Finally, isolate the parking brake components. The lever extends through the backing plate, engaging the secondary shoe via a strut. Follow the cable from the lever to the equalizer; the blueprint details its route behind the axle housing. Ensure the cable’s outer sheath is continuous–frayed sections cause drag, preventing full release. Test adjustment by pulling the lever: shoes should snap into contact at 5–7 clicks; fewer suggests insufficient tension, more indicates over-adjustment or binding.
Key Friction Zones and Service Components in Rear Wheel Cylinder Assemblies
Inspect brake shoes every 12,000 miles or whenever uneven lining thickness exceeds 2mm–the rivet depth should never drop below 1.5mm. Primary wear occurs on the trailing edge of secondary shoes due to self-energizing force distribution during deceleration; replace pairs to prevent imbalance.
Wheel cylinders demand attention at the first sign of fluid seepage or piston seizure. Contaminated seals swell within 6 months of exposure to moisture-laden fluid; flush the system with DOT 4 every two years and install new seals (part #F3ZZ-2B200-A) during pad changes. Corrosion builds on bore surfaces beneath stuck pistons–polish with 600-grit wet paper or replace the unit if pitting exceeds 0.05mm.
Adjuster Mechanism Failures
Star-wheel adjusters freeze from rust accumulation after 30,000 miles; disassemble and lubricate threads with high-temperature ceramic paste (Lubriplate 3000). Worn ratchet teeth skip during adjustment–check engagement under load by rotating the adjuster backward until resistance meets 3-5 Nm torque. Replace if play exceeds 0.3mm at the engagement point.
Return springs lose tension predictably: the top spring weakens 20% by 40,000 miles, the shoe hold-down springs fatigue 15% sooner if exposed to salt. Measure free length against new specifications–175mm for the primary spring, 120mm for hold-down springs–and swap any with less than 90% of original tension. Use zinc-plated springs (Motorcraft BRB-11) to resist corrosion in humid climates.
Hardware kits (Motorcraft BRK-43) include critical torque specifications often ignored: backing plates require 35 Nm on anchor bolts, wheel cylinder fasteners 25 Nm. Over-torquing distorts the plate, causing shoe misalignment and accelerated lining wear. Check plate flatness with a straightedge–repair or replace if deflection exceeds 0.5mm.
Parking brake cables stretch 5% annually; adjust tension to maintain 5-7 clicks of engagement. The equalizer lever pivot rusts quickly–apply anti-seize to the pivot pin and lubricate inner cables with dry Teflon spray every 15,000 miles. Replace cables if the inner wire shows more than three frayed strands or if outer housing cracks expose the core.