This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

08 Rear Brake Bleed

Joined Feb 2012
81 Posts | 2+
Townsville Australia
I feel really stupid for having to make this thread, I checked the owners doc and all it says is it is "difficult". I did the front brake with no problems at all, I reverse bled it with a syringe with some clear tube on the end, I could physically see that no air bubbles went in but when I finished I now have no brake at all. They worked fine before, I only changed the fluid because it was really discolored.

My only idea I have at the moment is there is air in the line at the high point before the master cylinder?? I have locked the pedal down overnight in a hope that the air can escape, but given there is a high point in the system I guess this is unlikely. I was going to keep playing with it but I ran out of brake fluid, there's not much in those small motorex containers. Is it easier to bleed from the reservoir by forcing it through with a syringe rather then reverse bleeding?

Thanks in advance,

Chris
 
I have never used a syringe to bleed brakes. You should be able to just pump it with the brake levers and push the air out through the bleed nipples. Im guessing you are familiar with the bleeding process? If not, never let the lever return with the bleed open or it will suck air back in.
 
Bleeding the brakes in the traditional way of pumping the brake lever and opening the bleeder valve is a 'thankless task' as what you are attempting to do is to force air bubbles against gravity.

Don't bleed brakes this way.

Reverse (back) bleeding is by far the best way to bleed brakes. It can be done simply with a syringe filled with brake fluid with a tube attached to the bleeder valve.
 
I just bled a new LHRB System on my berg this afternoon. Normally I do the pump it up and release the pressure method after I get the fluid running out the bleeder with just gravity. I tried the syringe method before the gravity bleed and had no luck pushing in the fluid. After the gravity bleed was established the syringe worked great.
 
Working against gravity? Im pretty sure thats why it's called "pumping" the fluid through with the lever. You are using the pressure to push the fluid, not relying on gravity to drain it.
All of these ways obviously work, each to their own. Im keen to try one of those vac type bleeders!
 
Far out I'm a dunce. Got some more fluid after work and had a look at it. This rear brake is possibly the easiest one ever to bleed. I stuck a tube on the end of the bleed nipple and ran it into a catch can, I lockwired it there so it wouldn't leak. I looked in the reservoir and a syringe fits snugly in the hole in the bottom. You can just pump it through the system with a syringe no worries at all, got all the air out (was alot more then I expected) and it works like a charm. Saves all the pumping, you can just lean over and crack the nipple and push the syringe, locking it off while you still have positive pressure.
 
akshun said:
Working against gravity? Im pretty sure thats why it's called "pumping" the fluid through with the lever. You are using the pressure to push the fluid, not relying on gravity to drain it.

Working against gravity - - meaning air bubbles rise to the top, therefore it is more efficient to force brake fluid in from the bottom to push air bubbles out at the top.
 

Register CTA

Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.

Recent Discussions