How to Adjust Hydraulic Disc Brakes on an Ebike?

How to Adjust Hydraulic Disc Brakes on an Ebike?


Initially, setting the brakes on a bicycle may be a challenging operation, but after you are familiar with the ins and outs of the sort of brakes you have and how they function, adjusting the brakes becomes second nature. We will go through the process of changing the front brakes on your bike in this in-depth discussion. First and foremost, you need to be aware of the many kinds of brakes available to you.

Adjusting the Ebike Brakes: The Fundamentals

To get things started, let's look at a couple of the components that make up the brakes. You've got the lever for the brakes upon the bike's handlebar. A brake wire runs through it for the mechanical disc brakes, and there is a brake caliper, which is the mechanism that squeezes the brake rotor, which is the disc affixed to the wheel. Both of these components are located on the hub.

To ensure that your mechanical disc brakes continue to function as efficiently as possible, you need to take the following preventative measures: (1) adjust the position of the inner pad so that it is flush against the inside of the rotor; (2) adjust the cable stretch adjustment so that it is set as low as possible so that the brake is engaged as soon as the lever is pulled. There shouldn't be much wiggle room or deflection in the rotor as you move your lever. When we talk about "deflection," we mean that the rotor is rocking back and forth, and when we talk about "play," we mean the movement of the lever or the amount of cable adjustment that was dialed in or out.


Fundamental Skills and Knowledge of Adjustments

 As soon as you let go of the lever, the brake pads slide back out to the same distance away from the rotor, allowing the rotor to slide freely between the pads and the caliper without dragging. This would be your fundamental strategy for making adjustments. Check with your eyes to observe which pad seems significantly closer or farther away from the rotor. After that, you will need to make adjustments so that the brake pads are seated in the correct position, at an equal distance away from the rotor.



The most obvious sign of a caliper out of alignment is pad/rotor friction. Nevertheless, pad/rotor rub may also be caused by a wheel not being seated correctly.

Check to ensure that your wheel is positioned correctly. This step applies to bicycles with through axles and those with open dropouts. Turn the quick-release lever counterclockwise while your bike is still on the floor (or axle nut if no QR is present). Put some downward pressure on the bike to check if the frame and the axle are in touch with each other. Adjust the lever for the quick-release again.

Make sure there is no pad or rotor rub. Raise the bicycle off the ground, turn the wheel, and look for spaces between the rotor and the pads. Illuminating the caliper from behind will make it much simpler to read.



  • Suppose you want to adjust the brakes on a mechanical disc brake yourself. In that case, you'll need a wrench with a five-millimeter opening and some knowledge of the fundamentals of how the automatic braking system works. Altering the inner pad and adjusting the amount of slack on the cable wire are necessary steps in this process.
  • After you have checked that your wheels are correctly mounted and eliminated any other potential causes of pad/rotor rub, you are ready to start the alignment process. Both the front and the back brakes are adjusted using the same method.
  • Loosen both of the mounting nuts until the caliper body may quickly move left to right and right to left. Note that the mounting bolts for certain bicycles are either on a bracket or below the chainstay.
  • Squeeze the brake lever. This positions the body of the caliper so that it is centered above the rotor.
  • Adjust the mounting bolts while maintaining your grip on the lever.
  • Take your foot off the brake lever.
  • Turn the wheel to see if there is any pad rub.
  • If there is no rubbing, then the pads are in the correct position. The procedure is finished after the mounting bolts have been torqued to their maximum, typically between 6 and 8 Nm.
  • Proceed to step 7 for some fine-tuning if there is still rubbing after completing step 6.
  • Take another spin with the wheel. While the wheel is turning, unscrew one of the bolts, and make the necessary adjustments by pressing the caliper in the direction of the rub until there is a space on each side of the rotor. When working near a spinning wheel, use extreme care with your fingers and instruments. If you cannot locate a satisfactory alignment, you should repeat the operation on the opposite bolt. As soon as the pads are no longer rubbing against one another, firmly tighten each mounting bolt to a torque of between 6 and 8 Nm, and the operation will be finished.


Adjustments to Brakes at the Suggested Intervals

Now, how often should you adjust the brakes on your bicycle? That is somewhat up to interpretation. You need to make sure that you do this consistently, but the frequency of your maintenance relies on how frequently you ride your bike. If you drive to work every day, you should inspect your brakes at least once a week at the absolute least if you don't have a particularly long commute, perhaps once or twice a month. On the other hand, if you don't ride your bike all that frequently, you probably don't need to do it quite as often. We advise adjusting your brakes at least three times a year for optimal performance.

Now, if you own an electric bike, you should anticipate having to make adjustments to your brakes at least twice or thrice every month on average. The strain placed on the brakes of electric bikes is significantly greater than that put on the brakes of standard geared bicycles. This is because electric bikes are capable of reaching higher speeds. Because of this, the brake pads on electric bicycles wear down more quickly due to the increased number of stops and starts that occur at more incredible speeds.

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