Factory Mercedes-Benz Brake Calipers
Bleed Valve
Bleed Valve
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The Key to Making Brake Calipers Last
The brake caliper transforms the fluid pressure generated by your master cylinder into immense mechanical clamping force. This component straddles the spinning rotor and squeezes the friction material to stop your vehicle. Operating at high temperatures and under massive hydraulic pressures, the calipers must function flawlessly to maintain your vehicle's advanced PRE-SAFE® and Electronic Brake Force Distribution (EBD) capabilities.
Maintaining Your Hydraulic Braking System
Perform the following checks to ensure your Mercedes-Benz C-Class remains safe on the road:
1. Examine the Piston Dust Boots
Look closely at the rubber bellows surrounding the piston; any tearing or dry-rot allows moisture and grit to enter.
2. Inspect for Hydraulic Leaks
Check the bottom edge of the caliper housing and the brake line banjo bolt connection for any weeping fluid.
3. Evaluate the Slide Pins
On floating caliper designs, physically grab the housing and push it back and forth; it should slide smoothly without requiring excessive force.
4. Check the Bleeder Valve Integrity
Ensure the rubber dust cap is present on the bleeder screw.
5. Analyze Piston Retraction
After a hard drive, carefully use an infrared thermometer to check wheel temperatures.
Frequently Asked Questions
- How often do genuine Mercedes calipers need to be replaced?
- Under normal driving conditions, OEM calipers typically last between 75,000 and 100,000 miles.
- Can I rebuild my caliper instead of buying a new one?
- Yes, genuine Mercedes caliper overhaul kits containing fresh seals and dust boots are available.
- What kind of brake fluid should I use when replacing a caliper?
- Mercedes-Benz strictly requires the use of approved DOT 4 Plus (or DOT 4 LV) brake fluid to maintain proper ESP and ABS pump functionality.
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