How to Cap Brake Lines? And How to Replace Brake Lines [Step by Step Guide]
How to Cap Brake Lines and How to Replace Brake Lines

How to Cap Brake Lines? And How to Replace Brake Lines [Step by Step Guide]

How to Cap Brake Lines? And How to Replace Brake Lines [Step by Step Guide]

How to Cap Brake Lines? Brake fluid is critical for your automobile, and it’s crucial to keep the system in excellent shape. Because of this, it is essential to know how to correctly cover brake lines to prevent fluid leakage.

By following our step-by-step instructions, you will quickly be able to cap brake lines like an expert.

What is Brake Line Cap?

The purpose of brake line caps is to prevent braking fluid from leaking from the system. Plastic and metal are the two types of caps available. Plastic caps are commonly seen on older cars, whereas metal caps are more popular on contemporary vehicles.

Typically constructed of brass or aluminum, metal brake line covers are put into place. Plastic caps, on the other hand, are often pressed in or kept in place by a retaining clip.

Why is it Important to Cap Brake Lines?

It is crucial to cap brake lines because it prevents fluid from seeping out. If the brake fluid spills, the brakes might fail. In certain instances, it can also contribute to corrosion and rust in the braking system.

Additionally, leaking brake fluid can cause damage to the brake lines and other components of the braking system.

How to Cap Brake Lines?

Cap Brake Lines in Straightforward Steps

how to cap brake lines-There are two options
how to cap brake lines-There are two options

Cap Brake Lines with Plastic Cap

Step 1: Locate the brake line that requires capping. It is often situated close to the braking caliper or master cylinder.

Step 2: Identify the kind of Cap that is on the brake line in Step 2. If it is a plastic cap, it will be held in place by a retaining clip.

Step 3: Using a Flathead screwdriver, remove the holding clip in Step 3. This will allow you to remove the Cap by releasing its pressure.

Fourth Step: Remove the Cap from the brake line. It should be simple to remove.

Step 5: Replace the brake line cover and press it into place. Ensure that the retaining clip is in place to prevent the Cap from falling off.

Step 6: Test the Cap to ensure its integrity. This is accomplished by gently pushing on the Cap. If it falls loose, the holding clip must be replaced.

Also Read: Bracketed Vs. Unbracketed Brake Calipers? Major Differences

Cap Brake Lines with Metal Cap.

Step 1: Purchase a metal cover with the same diameter as your brake line in Step 1. These are available at most auto parts stores.

Step 2: Place the metal cover over the end of the brake line in the second step. It should be a tight fit.

Step 3: Tap the metal cap with a hammer until it fits snugly against the brake line. Be cautious not to harm the brake line during this process.

Step 4: Using a tool knife, trim any extra metal off the Cap.

Step 5: Your brake line is now shielded from dirt and rust with a protective cover. If you need to remove the Cap, just tap it off with a hammer.

Capping brake lines is a simple task that may be performed by anybody. By following our step-by-step instructions, you will quickly be able to cap brake lines like an expert.

Also Read: Brake Pad Replacement Cost [Real Cost Estimate Near Me]

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How to Replace Brake Lines?

The majority of automobiles are equipped with a hydraulic braking system that enables the driver to stop the vehicle by depressing a brake pedal. The braking fluid in the system flows through a system of brake lines comprised of steel pipes positioned in a permanent position beneath the vehicle and flexible rubber hoses connecting the steel pipes to the wheels. If any of these pipes or hoses develop a leak, they must be replaced immediately. If you lack the knowledge and expertise to operate on the braking system, delegate this task to a professional; a mistake might result in catastrophic brake failure.

Flexible Brake Hoses Replacement

Step-1: Disconnect the hose from the braking system in Step 1. From the central brake line to the caliper piston in disc brakes or the wheel cylinder in drum brakes, the flexible hose will most often be a rubber hose (sometimes it may be braided steel). To detach the hose, the retention clip between the hose and the steel line must be removed. Next, loosen the connection with a wrench by turning it counterclockwise.

• Do not over tighten these connections. If you do so, you risk bending the metal brake lines and replacing them as well. Instead, empty the line by severing the brake hose and heating the connection using a torch. This will loosen it, allowing you to remove it.

Step-2: Remove any brackets or bolts along the flexible line in the second step. Between the central line and the wheel, the brake hose can be attached to the strut or another solid location. You will need to trace the line from end to end to identify any such connections. Loosen and remove any mounting connections that are present.

Step-3: Remove the hose from the brake calliper or wheel cylinder in step three. After disconnecting the hose from the pipes leading to the master cylinder, remove it from the brake itself. To accomplish this, loosen the bolt located at the end of the brake line (known as a banjo bolt). This is often accomplished with a 14mm socket or wrench, however the size might vary by manufacturer and model. Separating the brake line from the banjo bolt and the brake is a washer on either side of the brake line that must be removed.

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Step-4: Attach the replacement hose to the brake calliper or wheel cylinder in step four. To attach the replacement brake hose, you will just reverse the removal process. This requires first installing the washers, followed by tightening the banjo bolt at the end of the brake hose.

Step-5: Attach the new hose to the braking system as the fifth step. Attach the retention clip first. Typically attached by sliding it into the proper holder at the end of the brake line, this keeps the brake hose in position while the connection is being made. Next, connect the brake hose to the lines leading to the master cylinder by tightening the connection. This must be performed with a wrench or flare nut wrench. Additionally, you must rejoin any brackets that secure the line (often found on the struts or other steering components).

Also See: How Often to Change Brake Pads -25,000 or 65,000 Miles?

Step-6: Step six is to bleed the brakes. Bleeding the brakes is required to remove air from the brake line once it has been injected. Open the bleeder cap found on the brake caliper or wheel cylinder and have someone pump the brake to expel the air. Wait until fluid is expelled from the bleeder cap before closing it.

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• For bleeding brakes, there are both pressure and gravity bleeders available.

• If you have any problems throughout this process, see a qualified mechanic for assistance. If this is done wrong, your brakes will not function, posing a grave safety risk. This is best left to a professional.

Identification of Brake Line Problems

• Inspect the brake fluid. In the engine compartment, locate the master cylinder or brake fluid reservoir by lifting the hood. It should be located near the driver’s side firewall. If you are uncertain about the exact position, consult the owner’s handbook. Insufficient brake fluid indicates a leak in the braking system.

• Eliminate the wheels. You must loosen the lug nuts with the vehicle still on the ground. Then, jack your vehicle up and secure it using jack stands. Once the vehicle is in the air, you may remove the lug nuts and tires. Be certain to slip the tires beneath the vehicle. This gives additional protection in the event that your jack stands fail.

• Inspect visually the brake lines. Look for any evidence of brake line damage. Rust on the steel lines may indicate an issue, and rubber lines that are dry or cracked must be replaced. Look for dripping or damp spots on the lines. Additionally, you should pay attention to the ground between the lines. The fluid will be visible on the ground if it drips.

• Examine the brake lines Occasionally, it is impossible to see the braking fluid beneath the vehicle. If you believe that your brake lines are leaking or have been broken, you should always feel the length of the lines with your hands. This will guarantee that no leaks are missed.

• Have a professional examine your braking system. If you are not a trained mechanic with a thorough grasp of your car’s braking system, you should avoid tampering with it. Request the assistance of a trained technician to ensure that the job is completed correctly and your car is safe to drive.

Also Read: How Long Does it take to Change Brakes?

Tips for Keeping Your Brakes and Brake Fluid in Good Condition.

brake lines maintenance
brake lines maintenance

Here are a few suggestions for keeping your brakes in excellent condition:

Suggestions for Maintaining Your Brakes and Brake Fluid
Regularly inspect your brake fluid level and replenish it off if required.
Every two years or so, flush your brake fluid to remove any moisture that may have collected.
Regularly bleed your brakes to remove any air that may have entered the system.
Regularly inspect your brake pads and discs for wear and tear.
If you detect any unusual noises or vibrations coming from your brakes, have them inspected immediately by a professional.
Don't forget to maintain your suspension on a regular basis, since this will keep your tires in good touch with the road and enhance your vehicle's braking performance.
If you will be doing severe braking (e.g., on a long downhill stretch), gradually increase your speed so that your brakes do not overheat and become ineffective.
By according to these easy guidelines, you should be able to keep your brakes in good condition and prevent severe issues from arising.

By according to these easy guidelines, you should be able to keep your brakes in good condition and prevent severe issues from arising.

Common Errors in Brake Installation

When installing brakes, it is essential to avoid frequent errors. Some of the most frequent errors include:

1. Insufficient tightness can cause the brake pads to become loose and rattle, which is both unpleasant and hazardous.

2. Over tightening: This can damage the threads on the brake caliper, making future removal of the brake pads difficult.

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3. Improper alignment of the brake pads might cause the brakes to screech or grind when engaged.

4. This can make it harder to remove the brake pads in the future and may cause damage to the threads on the brake caliper.

5. Failing to bleed the brakes: This might result in mushy brakes and a longer stopping distance.

6. It might cause harm to the parts and make the process more difficult than it has to be.

7. This might lead to errors and make the task more challenging than necessary.

8. Attempting to save money by utilizing substandard components: This might lead to difficulties in the future and may even void your warranty.

It is crucial to take your time and install brakes correctly.

Also Read: My Brake Pedal is Stiff and Car Won’t Start (Causes & Quick Fix)

Often Asked Questions on how to cap brake lines

Q) How does one cap a brake line temporarily?

A: If it is the rubber line, just clamp it with a pair of vice grips. After blocking the rubber line, connect the rear steel line and then rotate the caliper to join it. For the front, just reconnect the rubber line by turning the caliper and re-clamping the line.

Q) Is clamping the brake line safe?

A: This is not a wise decision. The brake fluid closest to the calliper is the dirtier brake fluid. Since this is the lowest position in the braking system, grime and debris accumulate here. If the brake hose is not disconnected, contaminated brake fluid might be pushed back into the ABS system.

Q) Can I drive with a brake line that is leaking?

A: Braking systems in modern vehicles are actuated by brake fluid, thus maintaining sufficient brake fluid in your vehicle is crucial for your safety and the safety of your family – brake fluid leaks are the most common cause of total brake failure, and you should not drive a leaking vehicle.

Q) Can braided brake lines be clamped?

A: Can braided hoses be clamped, or is it necessary to utilize a blank connection or plug? No, do not squeeze them.

Q) How much would it cost to replace every brake line?

A: Complete brake line replacement involves removing and replacing all four current brake lines. Depending on the type and model of the car, replacing all brake lines costs between $1,000 and $2,000.


A simple and efficient technique to preserve your brake lines from dirt and rust is to cap them. By following our step-by-step tutorial, you’ll soon be able to do the task with ease. Use the proper equipment and carefully adhere to the instructions to avoid frequent errors. We hope that this tutorial proved useful.

Also Read:

How Long Does It Take to Bleed Brakes? [In-Depth Guide]

Back Brakes Squeaking When Reversing [SOLVED!]


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