Replacing the clutch master cylinder on a BMW 733i or 735i involves several steps. Click to explore details and download the manual……
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below is a detailed guide on how to perform this replacement, including descriptions of the components involved.
### Tools and Materials Needed:
1. **Tools:**
– Socket set (metric)
– Wrenches (metric)
– Screwdrivers (flathead and Phillips)
– Pliers
– brake line wrench (if applicable)
– Torque wrench
– Needle-nose pliers
– Shop towels
– Car jack and jack stands
2. **Materials:**
– New clutch master cylinder
– brake fluid (DOT 4 or as specified in your owner’s manual)
– New hydraulic line (if needed)
– brake cleaner
– Gasket or thread sealant (if necessary)
### Components Involved:
– **Clutch Master Cylinder:** The component that converts the force from the clutch pedal into hydraulic pressure to engage/disengage the clutch.
– **Clutch Pedal:** The pedal that the driver presses to operate the clutch.
– **Hydraulic Line:** The line that carries the hydraulic fluid from the master cylinder to the slave cylinder.
– **Clutch Slave Cylinder:** The component that receives hydraulic pressure from the master cylinder to operate the clutch mechanism.
### Steps for Replacement:
1. **Preparation:**
– **Safety First:** Park the car on a level surface and engage the parking brake. Disconnect the battery to avoid any electrical issues.
– **Lift the Vehicle:** Use a car jack to lift the front of the vehicle and secure it on jack stands.
2. **Access the Clutch Master Cylinder:**
– The clutch master cylinder is typically located on the driver’s side of the engine bay, near the brake booster. You may need to remove some coverings or components to gain access, depending on the setup.
3. **Remove the Clutch Pedal Assembly:**
– locate the retaining clip or bolt that holds the clutch master cylinder to the clutch pedal. Use pliers or a screwdriver to remove it.
– Carefully pull the clutch pedal away from the master cylinder. Be cautious not to damage any surrounding components.
4. **Disconnect the Hydraulic Line:**
– locate the hydraulic line connected to the master cylinder. Use a brake line wrench to carefully unscrew the line. Have a catch pan ready to collect any leaking brake fluid.
– If the line is corroded or damaged, consider replacing it.
5. **Remove the Old Clutch Master Cylinder:**
– Unbolt the clutch master cylinder from the firewall using the appropriate socket or wrench. There are usually two or three bolts securing it.
– Once the bolts are removed, carefully pull the master cylinder away from the firewall and remove it from the vehicle.
6. **Install the New Clutch Master Cylinder:**
– Before installation, compare the new master cylinder with the old one to ensure proper fit.
– Position the new master cylinder in place
and secure it to the firewall with the bolts. Torque to the manufacturer’s specifications.
– Reconnect the hydraulic line to the new master cylinder and ensure it is tightened properly to prevent leaks.
7. **Reattach the Clutch Pedal:**
– Position the clutch pedal back onto the master cylinder and secure it with the retaining clip or bolt.
– Ensure that the pedal moves smoothly and is properly aligned.
8. **Bleed the Clutch System:**
– With the new master cylinder installed, you need to bleed the hydraulic system to remove air. This can usually be done by using a partner to pump the clutch pedal while you open and close the bleed valve on the slave cylinder.
– Make sure to keep the reservoir filled with brake fluid during this process to prevent introducing more air into the system.
9. **Test the System:**
– Once bled, check for any leaks around the master cylinder and hydraulic line.
– Reconnect the battery and start the vehicle. Press the clutch pedal to ensure it feels firm and engages/disengages the transmission smoothly.
10. **Reassemble and Clean Up:**
– If any components were removed to gain access, reinstall them.
– Clean up any spilled brake fluid and make sure all tools are accounted for.
### Conclusion:
Replacing the clutch master cylinder on a BMW 733i or 735i is a manageable task if you follow these steps carefully. Always consult your vehicle’s service manual for specific torque specs and procedures related to your model year, as there may be slight variations. If you’re unsure about any part of the process, it’s advisable to seek help from a professional mechanic.
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