🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Rear drum brake wheel cylinder leak
💰 Estimated Repair Cost
$40 – $120 USD
Parts and labour estimate
🔧 Tools Required
Drum brake tools, brake fluid
📋 Overview
The rear drum brake wheel cylinders corrode internally and begin leaking brake fluid into the drum. Contaminated brake linings cause pulling to one side and loss of braking efficiency.
🩺 Symptoms
- Brake fluid inside rear drums
- pulling to one side under braking
- rear linings contaminated
- fluid level dropping
🔍 Possible Causes
- Corroded wheel cylinder bore
- failed cup seals
- fluid contaminating linings
🛠️ Diagnosis Steps
Remove rear drums. Inspect inside for brake fluid wetness around wheel cylinder.
✅ Most Confirmed Fix
Replace wheel cylinders. Replace contaminated brake linings. Bleed brakes.
79% of users confirm this fix worked (21 reports)
🏷️ Parts Needed
Rear wheel cylinder set; brake linings
🔗 Other Mercedes-Benz W115 Faults
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