If your patio door or window no longer stays open, it is usually the window brake that has worn out. The window brake is the mechanical brake that allows the door or window to remain open without blowing back.

When the brake breaks, you often notice that the door slides back or that it no longer stays in the ventilation position. Fortunately, it is usually quite easy to replace the window brake yourself.

In this guide, we go through how to identify the correct brake and how to replace it step by step.

Signs that the window brake needs to be replaced

There are some clear signs that a window brake is starting to wear out or break.

• The balcony door does not stay in the open position
• The door blows again when there is wind
• The window slides back after opening
• There is no resistance when you open the door

If you experience any of these problems, it is usually time to replace the brake.

Which window brake is in my door?

Before ordering a new brake, you need to identify which model you have. The most common models in Swedish homes are, for example:

• Assa Fix 150
• Assa Fix 160
• Assa 750
• Assa 760

You can often identify the model by:

• check the marking on the brake
• measure the length of the brake box
• compare with pictures of new brakes

Here you can see all models:

See all window brakes at Secureus

Step 1 – Open the door or window fully

Start by opening the patio door or window completely so that you can easily access the brake. The window brake is normally located at the top of the door or window.

Step 2 – Loosen the bracket in the frame

The brake arm is attached to the frame with a small plate or bracket.

Pull the sheet metal downwards or loosen the bracket so that the brake arm comes off the frame.

Step 3 – Unscrew the old brake

The next step is to unscrew the brake itself from the door leaf.

• Locate the screws at the top of the door
• Unscrew them with the right tool (often Torx)
• Lift out the old brake

Step 4 – Install the new window brake

Once the old brake is removed, you can install the new one.

1. Place the brake in the same position as the old one
2. Screw it into the door leaf
3. Attach the brake arm to the frame

Make sure the screws are tight, but do not overtighten.

Step 5 – Check that the brake is working

Once the brake is installed, you should test its function.

• Open the door in different positions
• Check that the door stops
• Make sure the brake provides adequate resistance

If everything is working correctly, the door should now be able to stay open without moving.

Frequently asked questions about window brakes

Can you replace the window brake yourself?

Yes, in most cases it is a simple job that takes less than 30 minutes.

Do you need special tools?

Usually, a screwdriver or Torx screwdriver is sufficient, depending on the model installed in the door.

Which window brake is suitable for patio doors?

The most common models are Assa Fix 150 and Assa Fix 160, but there are also other variants depending on the door type.

Summary

Replacing a window brake is often a simple project that can solve the problem of doors or windows that won't stay open.

• Identify the correct brake model
• Dismantle the old brake
• Install the new one
• Test the function

If you need a new brake, you can see the full range here:

See all window brakes