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Home / DTC / C001E — Right Rear Hydraulic Release Too Long

C001E — Right Rear Hydraulic Release Too Long

Detailed page for trouble code C001E.

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Code

C001E

Generic C — Chassis

Right Rear Hydraulic Release Too Long

Brand: Generic
Type: C — Chassis
Views: UK: 23 EN: 24 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Sticking or seized right rear caliper, wheel cylinder or mechanical brake components
  • Air in the right rear brake hydraulic circuit or partial blockage in line
  • Faulty ABS/ESC hydraulic modulator valve or solenoid (right rear release)
  • Low or contaminated brake fluid, internal master cylinder problem
  • High resistance/faulty wiring or connector to the modulator valve (open, short, corrosion)
  • Defective ABS/ESC control module or internal driver

Symptoms

  • ABS, traction control or ESC warning lamp illuminated
  • Longer than normal stopping distance or delayed brake release feel at the right rear
  • Brake drag, noise or uneven pad wear at right rear wheel
  • Brake pedal pulsation during ABS activation or unusual pedal feel
  • Possible pulling to one side under braking

What to check

  • Read and record freeze frame data and all stored ABS/ESC faults with a capable scan tool
  • Verify wheel speed sensor signals and compare right rear to other wheels while rotating wheel
  • Command right rear release valve with scan tool and observe response (time and current)
  • Visually inspect right rear caliper, pads, parking brake components and hub for binding
  • Inspect hydraulic lines, fittings and right rear hose for kinks, blockages or damage
  • Check brake fluid level and condition; look for contamination or signs of internal master cylinder leakage

Signal parameters

  • Commanded valve/solenoid state (ON/OFF)
  • Valve/solenoid duty cycle or current draw during actuation (mA or A)
  • Measured hydraulic release time (ms) vs commanded
  • Wheel speed sensors: right rear speed vs other corners during activation
  • Brake line/modulator pressure (if pressure sensor available) before/during/after release

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data with a diagnostic tool. Record and clear codes, then attempt to reproduce.
  2. Visually inspect right rear brake hardware (caliper, pads, parking brake) for mechanical binding or seizure. Free moving parts manually where safe.
  3. Check brake fluid level and condition. Top-up if low and inspect for contamination. If contamination suspected, plan fluid flush.
  4. With vehicle safely lifted and wheel off, rotate the wheel to detect drag or binding. Compare to other wheels.
  5. Monitor live data: wheel speed, commanded valve state and solenoid current while commanding right rear release from scan tool. Note response time and current profile.
  6. Measure electrical continuity and resistance of wiring to the right rear solenoid/valve; inspect connectors for corrosion, bent pins or water intrusion.
  7. If electrical looks good but response is slow, bench-test or replace the right rear modulator valve/solenoid or have the ABS hydraulic unit tested/rebuilt per procedure.
  8. If a mechanical restriction or contaminated fluid is found, repair/replace the affected brake hardware and perform a complete bleed of the hydraulic system following manufacturer procedure (pressure or vacuum bleed as specified).
  9. After repairs, clear codes and perform a road test under safe conditions to verify proper operation and that C001E does not return.
  10. If problem persists after hydraulic and mechanical checks, evaluate the ABS/ESC control module for internal fault or program updates; consult manufacturer service information.

Likely causes

  • Sticking caliper or mechanical restriction at the right rear brake
  • Hydraulic modulator solenoid for right rear is not opening/closing within spec
  • Contaminated fluid or air causing sluggish hydraulic response
  • Electrical fault to the valve (open circuit, high resistance, corroded connector)

Fault status

⚠️ Status
Right rear hydraulic release time exceeded expected threshold — possible stuck valve/circuit or slow hydraulic response.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

C0010 C001F C0020 C0040 C0100
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Code

C001E

HYUNDAI C — Chassis

Right Rear Hydraulic Release Too Long (Subfault)

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 11 EN: 15 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Sticking or seized right rear caliper, wheel cylinder or mechanical brake components
  • Air in the right rear brake hydraulic circuit or partial blockage in line
  • Faulty ABS/ESC hydraulic modulator valve or solenoid (right rear release)
  • Low or contaminated brake fluid, internal master cylinder problem
  • High resistance/faulty wiring or connector to the modulator valve (open, short, corrosion)
  • Defective ABS/ESC control module or internal driver

Symptoms

  • ABS, traction control or ESC warning lamp illuminated
  • Longer than normal stopping distance or delayed brake release feel at the right rear
  • Brake drag, noise or uneven pad wear at right rear wheel
  • Brake pedal pulsation during ABS activation or unusual pedal feel
  • Possible pulling to one side under braking

What to check

  • Read and record freeze frame data and all stored ABS/ESC faults with a capable scan tool
  • Verify wheel speed sensor signals and compare right rear to other wheels while rotating wheel
  • Command right rear release valve with scan tool and observe response (time and current)
  • Visually inspect right rear caliper, pads, parking brake components and hub for binding
  • Inspect hydraulic lines, fittings and right rear hose for kinks, blockages or damage
  • Check brake fluid level and condition; look for contamination or signs of internal master cylinder leakage

Signal parameters

  • Commanded valve/solenoid state (ON/OFF)
  • Valve/solenoid duty cycle or current draw during actuation (mA or A)
  • Measured hydraulic release time (ms) vs commanded
  • Wheel speed sensors: right rear speed vs other corners during activation
  • Brake line/modulator pressure (if pressure sensor available) before/during/after release

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame data with a diagnostic tool. Record and clear codes, then attempt to reproduce.
  2. Visually inspect right rear brake hardware (caliper, pads, parking brake) for mechanical binding or seizure. Free moving parts manually where safe.
  3. Check brake fluid level and condition. Top-up if low and inspect for contamination. If contamination suspected, plan fluid flush.
  4. With vehicle safely lifted and wheel off, rotate the wheel to detect drag or binding. Compare to other wheels.
  5. Monitor live data: wheel speed, commanded valve state and solenoid current while commanding right rear release from scan tool. Note response time and current profile.
  6. Measure electrical continuity and resistance of wiring to the right rear solenoid/valve; inspect connectors for corrosion, bent pins or water intrusion.
  7. If electrical looks good but response is slow, bench-test or replace the right rear modulator valve/solenoid or have the ABS hydraulic unit tested/rebuilt per procedure.
  8. If a mechanical restriction or contaminated fluid is found, repair/replace the affected brake hardware and perform a complete bleed of the hydraulic system following manufacturer procedure (pressure or vacuum bleed as specified).
  9. After repairs, clear codes and perform a road test under safe conditions to verify proper operation and that C001E does not return.
  10. If problem persists after hydraulic and mechanical checks, evaluate the ABS/ESC control module for internal fault or program updates; consult manufacturer service information.

Likely causes

  • Sticking caliper or mechanical restriction at the right rear brake
  • Hydraulic modulator solenoid for right rear is not opening/closing within spec
  • Contaminated fluid or air causing sluggish hydraulic response
  • Electrical fault to the valve (open circuit, high resistance, corroded connector)

Fault status

⚠️ Status
Right rear hydraulic release time exceeded expected threshold — possible stuck valve/circuit or slow hydraulic response.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

C0010 C001F C0020 C0040 C0100
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