Seems a bit strange, but both my Atlas and the wife's Omega have developed spongy rear brakes after 1000 miles. It's obvious that the rear pads are worn but not to an extreme level. Both bikes utilize the "Zoom HB875" hydraulic disk brakes. Do bicycle hydraulic brakes have a tendency to introduce air into the lines as the oil level drops in the tiny reservoirs? Anyone else experiencing this condition?
Spongy rear brakes
- Thread starter KnobbyGuy
- Start date
keithj69
Well-Known Member
- Region
- USA
- City
- Central Florida
Zoom bleeding instructions to get you started.
Time to get a bleed kit. My bike showed up with a spongy front brake. Finally braved it and got a kit and bleed both brakes. Was a nice difference when finally done.
Time to get a bleed kit. My bike showed up with a spongy front brake. Finally braved it and got a kit and bleed both brakes. Was a nice difference when finally done.
Gionnirocket
Well-Known Member
- Region
- USA
- City
- Y. O.
No need to do a full bleed.
Just do a top off of fluid thru the lever.
Just do a top off of fluid thru the lever.
Last edited:
PCeBiker
Well-Known Member
- Region
- Canada
That's what I did, and it worked.
I watched a video where the guy stood his mountain bike on the back wheel and bounced the bike up and down to get all the bubbles to rise up to the reservoir.
My ebike weighs 70 pounds without the battery and tool kit, so that wasn't going to happen.
I was worried that I had bubbles trapped in the arch of the brake line that wouldn't rise up to the reservoir,..
So I removed the brake caliper and set it on the floor and raised the front end of my bike so that the brake line was sloping upwards.
Then I flicked the line and pumped the lever to get the bubbles to rise.
Gionnirocket
Well-Known Member
- Region
- USA
- City
- Y. O.
Yup.... daś how you do it!
Gots to be smarter than an air bubble
Gots to be smarter than an air bubble
PCeBiker
Well-Known Member
- Region
- Canada
I ended up breaking the threaded part off the bottom of the funnel and got mineral oil all over everything.
Daś not how you do it!
PS,..
Be careful with the funnel.
They're pretty delicate.
Just an FYI,..
I was going to use regular mineral oil instead of buying the kit, (because I'm cheap.
) but I found out that regular mineral oil is WAY thicker than the treated stuff used for brakes.
Last edited:
fooferdoggie
Well-Known Member
our tandems bake caliper is fun to bleed with such a long hose.
Gionnirocket
Well-Known Member
- Region
- USA
- City
- Y. O.
Mine has a brass threaded adapter but yeah.. Be careful.I ended up breaking the threaded part off the bottom of the funnel and got mineral oil all over everything.
Daś not how you do it!
PS,..
Be careful with the funnel.
They're pretty delicate.
Just an FYI,..
I was going to use regular mineral oil instead of buying the kit, (because I'm cheap.
I was going to use Hawaiian Tropic Sun Tan Oil since it's mostly mineral oil and pretend I was @Rome
Easy... Just bleed while doing a wheelie
PCeBiker
Well-Known Member
- Region
- Canada
Rome
Well-Known Member
- Region
- USA
I no joke you in Hawaii certain tanning oils and sunscreens are banned.Mine has a brass threaded adapter but yeah.. Be careful.
I was going to use Hawaiian Tropic Sun Tan Oil since it's mostly mineral oil and pretend I was @Rome
Easy... Just bleed while doing a wheelie
There are additives and chemicals that destroys corrals and reel fishes too. If you come here with your own sunscreens it will be confiscated at the airport and treated as if you were smuggling meth. You have to buy State approved sunscreens and tanning oils locally.
Back to subject, I have my brakes serviced at the dealership once a year and new friction material they will recommend new rotors if need.
PCeBiker
Well-Known Member
- Region
- Canada
PCeBiker
Well-Known Member
- Region
- Canada
Rome
Well-Known Member
- Region
- USA
Yeah it's under @100 buck for front and rear, no headache if it gets spongy I just send it back.
I don't service my Bafang. I bought a plug and play motor already lubed with red Mobil grease all I need to do is install with correct tourqe and make sure it is loktite.
Chains and cassette I remove and replace them myself and tune it myself.
Setting up tubeless is done at the shop . I had a very difficult time with Eddy Current tires. I perform my own sealant refresh with parks tool syringe.
In fact I did that past weekend when I pulled thorns off of it.
I don't service my Bafang. I bought a plug and play motor already lubed with red Mobil grease all I need to do is install with correct tourqe and make sure it is loktite.
Chains and cassette I remove and replace them myself and tune it myself.
Setting up tubeless is done at the shop . I had a very difficult time with Eddy Current tires. I perform my own sealant refresh with parks tool syringe.
In fact I did that past weekend when I pulled thorns off of it.
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