Is it possible to adjust hydraulic brakes?

Modern hydraulic brakes automatically compensate for pad wear. That means routine adjustment is usually limited to centering the brake caliper. To align the caliper, you typically only need an Allen key and a bit of patience. When replacing brake pads, you can reset the pistons. Many systems also allow you to adjust the lever reach without tools. Bleeding the brake system is more involved and requires the correct bleed kit. If you’re unsure, it’s best handled by a professional workshop.

How often do mechanical brakes need adjustment?

With mechanical brakes, pad clearance needs regular adjustment depending on mileage and braking habits. Cable tension should also be checked, as cables can stretch over time. For adjustment, you’ll usually need an Allen key. Depending on the model, a Phillips screwdriver or Torx key may also be required. Adjusting a mechanical brake works the same way on both the front and rear wheel.

ADVICE / REPAIR & MAINTENANCE

How to adjust bike brakes

If you like working on your bike yourself, adjusting your brakes is an essential part of regular maintenance. In this guide, you’ll learn how to check your braking performance, determine the most common brake systems, and identify when and how to make adjustments.

> When do you need to adjust the brakes on your bike?
> Adjusting mechanical vs. hydraulic brakes

Common types of bike brakes

Not all bike brakes work the same way. Before making any adjustments, identify which system is installed on your bike.

Disc brakes are now the most common type. They deliver strong, consistent braking performance in all weather conditions. The brake pads inside the caliper press against a rotor mounted to the hub to create braking force.
Rim brakes are still common on older bikes and many city bikes. They provide solid braking in dry conditions but can lose power in wet weather. Here, the brake pads press directly against the rim’s braking surface via the brake arms.

Less common systems include drum brakes, roller brakes, and coaster brakes. In this guide, we focus on rim and disc brakes.

When do you need to adjust your bike brakes?

You should always be able to rely on your brakes. As a rule of thumb, braking power should engage after about one third of the lever travel. If the lever pulls too far or braking feels weak or inconsistent, it’s time to make an adjustment. The reasons differ depending on whether you’re running rim or disc brakes.

Close-up of adjusting a rim brake with an Allen key

Rim brakes:

Brake pads are worn. The gap between the pad and the rim should usually be around 2–3 mm.
Cables and housing show signs of wear such as rust, cracks, or kinks and may need replacement.
Corrosion at the brake mounts causes friction and uneven alignment.
Bolts have loosened due to vibration.
You’re installing a new brake.

For step-by-step instructions, see our guide on how to adjust rim brakes.

Disc brakes:

The disc brake is rubbing because the brake caliper has shifted.
The brake disc is warped, for example due to heat.
You've replaced the brake pads
You've upgraded to a new disc brake

You can find out how easy it is to adjust your disc brake here: How to adjust disc brakes

Mechanical vs. hydraulic brakes

Besides the brake type, the way the brake is actuated also matters. Braking force is transmitted either mechanically via a bowden cable or hydraulically via brake fluid.