why does my BMW 3 Series E90/E91 (2005-2012) have a hard clutch pedal?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Replace Clutch Master Cylinder

• Tools Required: Socket set, wrench set, brake fluid
• Sub-steps:
  1. Locate the clutch master cylinder, typically near the brake master cylinder.
  2. Disconnect the hydraulic line from the master cylinder using a wrench.
  3. Remove the mounting bolts securing the master cylinder to the firewall.
  4. Install the new clutch master cylinder by reversing the removal steps.
  5. Reconnect the hydraulic line and ensure it's tightly secured.
  6. Fill the clutch reservoir with the appropriate brake fluid.

3. Inspect and Replace Clutch Slave Cylinder

• Tools Required: Socket set, wrench set, brake fluid
• Sub-steps:
  1. Locate the clutch slave cylinder, which is mounted on the transmission.
  2. Remove the hydraulic line from the slave cylinder.
  3. Remove the mounting bolts securing the slave cylinder to the transmission.
  4. Install the new slave cylinder and secure it with bolts.
  5. Reconnect the hydraulic line to the slave cylinder.

4. Bleed the Clutch Hydraulic System

• Tools Required: Bleeding kit or clear tubing, catch container
• Sub-steps:
  1. Locate the bleeder valve on the clutch slave cylinder.
  2. Attach tubing to the bleeder valve and place the other end in a catch container.
  3. Open the bleeder valve and have an assistant press the clutch pedal several times.
  4. Close the bleeder valve while the pedal is held down.
  5. Release the pedal and repeat until no air bubbles are observed in the fluid.