CKFCar Known Faults
ModerateAffected: 2012-201740,000–100,000 miles

Ford Fiesta Mk7 1.0 EcoBoost 100bhp — Sticking Brake Calipers (Slider Pins Seized)

The floating brake caliper design relies on sliding pins. In the UK climate, salt and water ingress cause these pins to rust and seize solid.

Severity

Moderate

DIY Difficulty

Moderate

Est. Cost

£80–£150

OBD Codes

None

Component Diagram

Brakes

Typical layout and location for the Brakes assembly.

Brakes diagram
Reference Illustration

Symptoms

  • Car pulls to one side when driving
  • Burning smell coming from one wheel after driving
  • One alloy wheel feels extremely hot to the touch
  • Severe, uneven brake pad wear

Root Cause

The rubber dust boots around the caliper slider pins perish or split. Water and road salt enter the cavity, rusting the steel pin into the aluminum caliper bracket.

How To Fix

  1. Remove the caliper and attempt to extract the seized pin using heat and vice grips.
  2. Clean the bore thoroughly with a wire brush.
  3. Fit new slider pins with high-temperature silicone grease.
  4. If the pin snaps, a new caliper carrier is required.
  5. Cost: £80-150

Estimated Repair Costs

Repair OptionEst. Cost (GBP)
DIY (parts only)£32–£60
Independent Garage£80–£150
Main Dealership£128–£240

Other Faults on This Variant

Timing Chain Stretch and Tensioner Failure

Critical
2012-201540,000–100,000 miles£600–£1200

Pre-2016 Ford 1.0 EcoBoost engines suffer from premature timing chain stretch. The plastic tensioner can fail, causing catastrophic engine damage with little warning.

Coolant Loss from Cylinder Head

Severe
2012-201860,000–120,000 miles£500–£900

The 1.0 EcoBoost has an integrated exhaust manifold cast into the cylinder head. This design causes head gasket stress and coolant loss, sometimes causing overheating.

Thermostat Failure and Overheating Risk

Moderate
2012-201850,000–100,000 miles£80–£180

The plastic thermostat housing on the 1.0 EcoBoost is prone to cracking. A stuck-open thermostat causes the engine to run cold and burn more fuel; a stuck-closed thermostat causes rapid overheating.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.