If you own a Nissan GU Patrol, you likely know how essential keeping everything in top shape is for off-roading and daily driving alike. One of the key components in the vehicle’s drivetrain system is the clutch master cylinder gu patrol clutch master cylinder. When this part begins to fail, you may experience a soft or spongy clutch pedal, difficulty shifting gears, or even a complete failure of the clutch. Fortunately, replacing the clutch master cylinder is a relatively straightforward task that you can tackle yourself with a bit of mechanical know-how.
In this guide, we’ll walk you through the step-by-step process to replace the clutch master cylinder on your GU Patrol. With the right tools and some patience, you’ll have your Patrol back in action and ready for more adventures.
Tools and Materials You’ll Need
Before you get started, make sure you have all the necessary tools and materials:
- Replacement clutch master cylinder (specific to GU Patrol)
- Socket set
- Ratchet wrench
- Wrenches (various sizes, including 10mm, 12mm, and 14mm)
- Screwdrivers (flathead and Phillips)
- Brake fluid (DOT 3 or 4, check your manual)
- Clear plastic tubing (for bleeding)
- Brake fluid catch container
- Jack and jack stands (if needed for additional clearance)
- Rags and gloves (for cleanliness and safety)
- Bungee cord or rope (to hold the clutch pedal down)
Step 1: Preparation and Safety
- Park the Vehicle on a Flat Surface
Make sure your GU Patrol is on a flat, stable surface to ensure safety while you work. Engage the parking brake to prevent the vehicle from rolling. - Disconnect the Battery
Always disconnect the negative terminal of the battery before working on any components related to the electrical system. This prevents accidental shocks and short circuits. - Lift the Hood and Locate the Clutch Master Cylinder
Open the hood and locate the clutch master cylinder. It is usually located on the driver’s side of the engine bay, near the firewall, connected to the clutch pedal via a pushrod.
Step 2: Drain the Brake Fluid
- Locate the Fluid Reservoir
The clutch master cylinder shares a fluid reservoir with the brake system, usually located on the driver’s side near the windshield. This is where you will drain the brake fluid from. - Drain the Fluid
Use a syringe or brake fluid pump to suck the fluid out of the reservoir. Be careful not to spill any brake fluid on the paint, as it can damage the finish. - Cover the Reservoir
Once the fluid has been drained, cover the reservoir with a clean rag to prevent dust and debris from entering.
Step 3: Remove the Old Clutch Master Cylinder
- Disconnect the Clutch Line
Using a 12mm or 14mm wrench, loosen and disconnect the clutch fluid line from the master cylinder. Have a rag ready to catch any residual brake fluid that may leak out. Be cautious when handling brake fluid as it is corrosive and can damage paint and plastic. - Remove the Mounting Bolts
Use your socket set to remove the two or three bolts that hold the master cylinder in place. These bolts typically secure the master cylinder to the firewall and to the pedal assembly. Keep these bolts, as you’ll need them to mount the new cylinder. - Disconnect the Clutch Pedal Pushrod
Depending on your model, the clutch master cylinder will be connected to the clutch pedal by a pushrod or clevis pin. Use a small screwdriver or pliers to remove any clips and then pull the pushrod out. - Remove the Old Master Cylinder
Once everything is disconnected, carefully remove the old master cylinder from the engine bay. It might take a little wiggling to get it out, especially if it’s been in place for years.
Step 4: Install the New Clutch Master Cylinder
- Prepare the New Master Cylinder
Before installation, compare the old and new master cylinders to ensure they match. Check that the pushrod, fluid inlet, and mounting holes align correctly. - Position the New Master Cylinder
Position the new master cylinder in place and secure it by inserting the mounting bolts back into place. Tighten the bolts snugly, but be cautious not to overtighten them. - Reconnect the Pushrod
Attach the new master cylinder’s pushrod to the clutch pedal assembly. Ensure the connection is secure and the pushrod moves smoothly. - Reattach the Fluid Line
Reconnect the clutch fluid line to the master cylinder and tighten the connection with a wrench. Make sure the line is seated properly to prevent leaks.
Step 5: Bleed the Clutch System
Once the new master cylinder is installed, the next crucial step is bleeding the clutch system to remove air from the hydraulic lines.
- Fill the Reservoir
Fill the fluid reservoir with fresh brake fluid (DOT 3 or 4, depending on your Patrol’s specifications). Keep the reservoir filled throughout the bleeding process. - Bleed the Clutch System
You’ll need a helper for this part. Have them pump the clutch pedal a few times and hold it down while you open the bleeder valve on the slave cylinder. Use a small piece of clear plastic tubing attached to the valve to direct fluid into a container. Tighten the valve while your helper releases the clutch pedal.Repeat this process until the fluid coming out of the bleeder valve runs clear and free of air bubbles. You may need to top off the fluid in the reservoir during this process. - Check for Leaks
Once the clutch system is properly bled, inspect all connections for leaks. Tighten any connections as necessary, and double-check that the fluid level is at the correct level.
Step 6: Final Steps
- Test the Clutch Pedal
With the system bled and the fluid topped off, press the clutch pedal several times. It should feel firm and responsive. If it still feels soft or spongy, you may need to bleed the system again. - Recheck Fluid Level
After a short test drive, stop and check the fluid level in the reservoir again. If the level is low, top it up and continue to check for leaks over the next few days. - Reconnect the Battery
Finally, reconnect the negative terminal of the battery, close the hood, and take your Patrol for a test drive.
Conclusion
Replacing the clutch master cylinder on your GU Patrol is a manageable task if you have the right tools and a bit of patience. By following these steps carefully, you can save yourself time and money while ensuring that your clutch system operates smoothly for years to come. Always remember to handle brake fluid with care and double-check for leaks after the job is done.
