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What size socket is a bleeder screw?

A bleeder screw, also known as a brake bleeder screw, is a small valve used in automotive brake systems to release air bubbles and bleed the brake lines. The size of the socket needed to remove a bleeder screw is typically 3/8 inch or 10 millimeters.


Understanding Bleeder Screws


Bleeder screws are an essential component of a vehicle's brake system. They allow mechanics and DIY enthusiasts to remove air bubbles that can accumulate in the brake lines, which can reduce the effectiveness of the brakes. Bleeding the brakes is a crucial maintenance task that should be performed periodically to ensure the brakes are functioning properly.


Identifying the Bleeder Screw Size


The size of the bleeder screw is typically determined by the make and model of the vehicle. Most modern passenger vehicles use either a 3/8-inch or 10-millimeter bleeder screw. Some older vehicles or specialty applications may use a different size, but these are less common.



  • 3/8-inch bleeder screws are the most common size, used in a wide range of vehicles.

  • 10-millimeter bleeder screws are also very common, especially in European and Asian-made vehicles.

  • Other sizes, such as 1/4-inch or 5/16-inch, are less common but may be found in some applications.


It's important to use the correct size socket when working with bleeder screws to avoid stripping or damaging the screw.


Checking the Bleeder Screw Size


If you're unsure of the size of the bleeder screw on your vehicle, there are a few ways to determine it:



  • Consult your vehicle's owner's manual or service manual, which should specify the bleeder screw size.

  • Visually inspect the bleeder screw and measure it with a caliper or micrometer to determine the diameter.

  • Try different socket sizes until you find one that fits snugly on the bleeder screw.


Knowing the correct bleeder screw size is essential for properly bleeding the brakes and maintaining your vehicle's brake system.

What diameter is a bleed tube?


I think 1/4" ID is good. Whatever will fit tight over the bleeder valve. You don't want to bleed it to the ground you want to put the other end of the bleeder hose into a container and submerge it with brake fluid. This way you can sees the bubbles and it won't get drawn back into the system.



What size tool do you need to bleed brakes?


A tool to open the bleed valve – usually an appropriate size wrench or line wrench is best for the job. The most common bleeder valve size is 10mm. A catch pan to collect the drained brake fluid.



What size socket is a brake bleeder screw?


Use a 6-point 7mm wrench...even better than flared wrenches.



What size are bleeder screws?


Re: Brake bleeder screw size??
IIRC, the bleeder screws are 8mm/5/16".



What size hose fits over a bleeder valve?


The tubing needs to be able to fit securely over the bleeder opening. The container should be clear so you can see the quality and volume of the fluid going into it. It also needs a small opening in the top for the vinyl tube to fit through, about 3/16 inches to 5/16 inches in diameter.



What size tube fits?


The size is almost always written somewhere on the sidewall of the tyre. Inner tubes typically state a wheel diameter and width range for which they will work, e.g. 26 x 1.95-2.125", indicating that the tube is intended to fit a 26 inch tyre with a width of between 1.95 inches and 2.125 inches.



What size tube fits on bleeder screw?


1/4" ID tube fits nice and snug.



How do you loosen a bleeder screw?


And we'll just tap it. In. And then whenever you tap it on what that does is it break some of the loop rust loose. And it'll put the socket. On so you can break it loose.



What size socket do I need to change my brakes?


The rotor is held in place by the tire/wheel assembly so you need a 19mm to remove the wheel nuts and a 14mm to remove the caliper bolts then the caliper support is 18mm.



What size wrench are bleeder valves?


Break it loose with a 6 point socket. You can use an ordinary 12 point end wrench to open and close during the bleeding process.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.