Brakes don’t work

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SCree88

New Member
Hello I’m new to this. Have purchased a used Carrera bike for my son. 18” frame mechanical brakes. Brakes don’t work. Have changed pads, rubbed to new coating off them and adjusted everything and the disc just spins and the when brakes applied you hear rubbing and not stopping them. Contacted a local bike specialist who said I should swap to hydraulic brakes as mechanical are useless. Is this true or are they just telling me this to get business and my money?
Thanks
 

C R

Guru
Location
Worcester
Hello I’m new to this. Have purchased a used Carrera bike for my son. 18” frame mechanical brakes. Brakes don’t work. Have changed pads, rubbed to new coating off them and adjusted everything and the disc just spins and the when brakes applied you hear rubbing and not stopping them. Contacted a local bike specialist who said I should swap to hydraulic brakes as mechanical are useless. Is this true or are they just telling me this to get business and my money?
Thanks

What type of bike is it? Flat bar or drop bar? What make and model are the calipers? Could you post some photos?

Many people, including me, ride bikes with mechanical disk brakes, and they definitely stop the bike.
 

EckyH

It wasn't me!
Brakes don’t work. Have changed pads, rubbed to new coating off them and adjusted everything and the disc just spins and the when brakes applied you hear rubbing and not stopping them.
Properly set up and adjusted mechanical disc brakes work. Some of them can work nearly as good as decent hydraulic brakes.
I assume that neither the disc rotor nor the brake pads are contaminated with grease or other lubricants.
Even fairly price optimised mechanical disc brakes will stop the bike.
This video is fairly good in my opinion:

View: https://www.youtube.com/watch?v=t9AONtEy7V8


Contacted a local bike specialist who said I should swap to hydraulic brakes as mechanical are useless. Is this true [...]?
No.

E.
 

DaveReading

Don't suffer fools gladly (must try harder!)
Location
Reading, obvs
The two most likely reasons for the brakes not working are

(a) not enough pressure being applied to the pads (i.e. binding or poor adjustment), or

(b) insufficient friction between the pads and disc (sub-standard pads or contamination).
 

Ming the Merciless

There is no mercy
Location
Inside my skull
Another shoot and run new member.
 

C R

Guru
Location
Worcester
The two most likely reasons for the brakes not working are

(a) not enough pressure being applied to the pads (i.e. binding or poor adjustment), or

(b) insufficient friction between the pads and disc (sub-standard pads or contamination).

There's another possibility. The calipers are MTB calipers, so require V brake levers, but the bike has can canti/road levers, which don't pull enough cable.
 

Pat "5mph"

A kilogrammicaly challenged woman
Moderator
Location
Glasgow
Nope could not be further from the truth. Just a frustration with people who sign up, ask a question, then disappear without engaging with the responses. It would be a bit like someone asking you for directions, then walking off without saying anything further, when you are mid response.
Imo, folks have stuff to do, sometimes a minor project like this goes to the back burner till the weekend.
On top of that, the forum has not been showing alerts to members, so maybe the OP thinks there aren't any responses yet.

Back on topic, many years ago I bought my Genesis Tour de Fer from a well known independent bike shop here in Glasgow.
He let me do a test ride round the park, I told him I liked the bike but it didn't brake properly - mechanical disk brakes.
He told me I needed to embed the pads. Many miles later of embedding the bike still would not stop properly.
I had another bike with hydraulics, so I knew what disk brakes can do.
Anyway, I got fed up, got another mechanic to change them for a new set of hydraulic brakes, perfect braking ever since.
I gave the old set away for free to someone on here, a member from Glasgow.
A couple of weeks later he told me that the brakes my bike was sold with were indeed pants, he could not get them to work either, ended up putting them in the recycling bin of a bike charity.
 
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