Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take Part in the June Giveaway Coming Soon (June 18th)


Topping up my hydraulic brakes without bleeding them
#1
I recently bought a mountain bike with hydraulic brakes.

When the brake fluid gets low, more needs to be added. There are a number of tutorials on Youtube, and other places on the internet. They involve bleeding the brakes.. That is having brake fluid flow through the brakes lines, to remove the air. The process is a bit involved.

I did it an easier way. I put the funnel in the brake lever, and added brake fluid. When I squeezed the brake lever, fluid ran in. When I released the brake lever, bubbles came out. I continued this until there were no more bubbles. The brakes were full. It was a simple process.

Not all bikes are the same as mine. On my bike, the brake hoses run down to the calipers, both front and back. With many bikes, the brake hoses might run down, then up again, then down again. Air will accumulate in the high points. When the hoses run continuously down to the calipers, and continuously up to the levers, the air works its way up. All of the air finishes up in the brake levers. There is no air trapped elsewhere. So it is a simple process to top up the brake levers.

My first caliper failed after 3000 km. I don't expect the other one to last really long. So I don't care about replacing the brake fluid.

https://forums.bikeride.com/thread-8564.html

As the hydraulic brakes fail, I replace them with cable brakes. Right now, I am running one of each.

https://forums.bikeride.com/thread-8570.html
  Reply
#2
Here is a picture of a bike with a similar shape to mine. You can see how the brake hoses run continuously down to the calipers, and air can rise continuously up to the levers, on both front and back. There is no down and up and down again in the brake lines, where air could get trapped.

Because the hoses are thin, the air may take some time to get to the top. But the air eventually all rises to the levers.

When the brake fluid is low, it only needs to be topped up, not bled.

   
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
What are your best tips for long rides?
Yesterday 09:48 PM
Reasons to buy aluminium not carbon bike...
Yesterday 12:19 AM
hello
Yesterday 12:16 AM
What did your first bicycle mean to you?
Yesterday 12:14 AM
Happy Fathers Day
06-16-2024 12:47 AM
Great CHEAP winter gloves (AKA This one ...
06-15-2024 10:35 AM
YABD - vintage Bernard Carré frame, etc
06-15-2024 01:11 AM
Forgot to introduce myself!
06-14-2024 11:07 AM
Fat bikes for ever..
06-13-2024 01:12 PM
Adding brake to kids balance bike
06-12-2024 11:06 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
40 posts
no avatar 2. enkei
26 posts
no avatar 3. Dusan
15 posts
no avatar 4. Amanda_W
12 posts
no avatar 5. meamoantonio
9 posts