Expert Tips: How to Remove Brake Booster BMW E36 Like a Pro!

Are you looking to replace your brake booster on your BMW E36? This essential component helps amplify the force you apply to the brake pedal, making it easier to stop your car. While it may seem daunting, removing the brake booster on a BMW E36 is a relatively straightforward task that can be tackled by any DIY enthusiast with basic mechanical skills. This comprehensive guide will walk you through the entire process, step by step, ensuring a smooth and successful removal.

Gather Your Tools and Materials

Before you begin, make sure you have the following tools and materials on hand:

• A set of metric wrenches and sockets (including 10mm, 13mm, 17mm, and 19mm)
• A flathead screwdriver
• A Phillips head screwdriver
• A torque wrench (optional, but highly recommended)
• A brake booster removal tool (optional, but highly recommended for easier removal)
• A new brake booster (ensure it’s the correct part for your E36 model)
• Brake fluid
• Shop towels
• Safety glasses
• Gloves

Prepare Your BMW E36 for the Removal

1. Park your BMW E36 on a level surface and engage the parking brake.
2. Disconnect the negative battery terminal to prevent any electrical hazards.
3. Open the hood and locate the brake booster. It’s usually positioned on the firewall, behind the engine, and connected to the master cylinder.

Disconnect the Brake Booster

1. Locate the vacuum hose connected to the brake booster. It’s typically a black rubber hose with a clamp.
2. Remove the vacuum hose clamp using a flathead screwdriver.
3. Carefully disconnect the vacuum hose from the brake booster.

Disconnect the Master Cylinder

1. Locate the brake lines connected to the master cylinder. These are usually metal lines with a flared end.
2. Using a wrench, loosen the brake line nuts at the master cylinder.
3. Carefully disconnect the brake lines from the master cylinder. Be sure to hold the lines to prevent fluid spillage.

Remove the Brake Booster

1. Identify the mounting bolts holding the brake booster to the firewall. There are typically two or three bolts.
2. Using a wrench or socket, loosen the mounting bolts.
3. If using a brake booster removal tool, insert it into the booster and gently pry it away from the firewall.
4. Carefully remove the brake booster by pulling it forward and away from the firewall.

Install the New Brake Booster

1. Position the new brake booster in place on the firewall, ensuring it’s properly aligned with the master cylinder.
2. Connect the vacuum hose to the new brake booster.
3. Connect the brake lines to the new master cylinder, ensuring they are tight.
4. Using a torque wrench, tighten the mounting bolts to the specified torque.
5. Reconnect the negative battery terminal.

Bleed the Brakes

1. With the engine off, depress the brake pedal several times to ensure the brake lines are filled with fluid.
2. Locate the bleeder valve on each brake caliper. It’s usually a small nipple on the top of the caliper.
3. Open the bleeder valve slightly and have a helper depress the brake pedal.
4. Continue pumping the brake pedal while keeping the bleeder valve open until new fluid flows out.
5. Close the bleeder valve and repeat the process for each brake caliper.
6. Once all the calipers have been bled, check the brake fluid level in the master cylinder and top off as needed.

Final Checks and Test Drive

1. Start the engine and check for any leaks in the brake system.
2. Test the brakes by gently applying the pedal. If the brakes feel soft or spongy, bleed the system again.
3. Take your BMW E36 for a test drive to ensure the brakes are functioning properly.

Beyond the Basics: Additional Tips

• Wear safety glasses and gloves when working with brake fluid, as it can irritate skin and eyes.
• Use a clean container to collect brake fluid during the bleeding process.
• Be careful not to overtighten the mounting bolts or brake line nuts.
• If you’re unsure about any step, consult a professional mechanic.

What People Want to Know

Q: What are the signs of a failing brake booster?

A: Common signs include a spongy brake pedal, a hard pedal that requires excessive effort, a hissing sound when applying the brakes, or a loss of brake pressure.

Q: Can I reuse the old brake lines when replacing the brake booster?

A: It’s recommended to replace the brake lines as well, especially if they show signs of wear or corrosion.

Q: How often should I replace the brake booster?

A: There’s no specific time frame for replacement. However, it’s a good idea to inspect the brake booster regularly for signs of wear and tear.

Q: Can I remove the brake booster without bleeding the brakes?

A: It’s not recommended. Bleeding the brakes is crucial to ensure proper brake function after replacing the booster.

Q: What should I do if I encounter problems during the removal process?

A: If you encounter any difficulties, consult a professional mechanic. They have the experience and tools to handle any issues that may arise.

By following these steps and taking your time, you can confidently remove the brake booster on your BMW E36 and install a new one. Remember to always prioritize safety and seek professional help if you encounter any difficulties. With a little effort and patience, you’ll be back on the road in no time, enjoying a smooth and safe ride.