Brakes

[ian emmerson]

Hi all,

I have mechanical disc brakes and the rear one is not as effective as it used to be and seems to slip , even under load.
All adjustments are ok and I have fitted and bedded in new pads as well as ensuring the discs are not contaminated.
I have also fitted a new cable on the off chance it was sticking .

At a loss to see what could happening.

 

[festival]

Have you adjusted the caliper and any adjustment screws to ensure a close fit to the rotor. On some budget models you sometimes have to accept a bit of rub to get a decent bite, but as you say it was fine before, have you bashed it out of line?

 

[Pauluk]

Have the rotors gone smooth/polished? How have you made sure the rotors are uncontaminated? What was your bedding in process?

 

[ian emmerson]

Looking at the rotor it appears more smooth than normal now that you mention it.

I cleaned them the other day with disc brake cleaner.

Bedded the pads in using harsh braking several times and gently braking whilst descending a hill.

 

[Pauluk]

There are some youtube videos showing how to use abrasive paper on your rotors to improve the braking surface. Over time the rotor surface will become smooth almost polished. This greatly reduces braking efficiency. Don't know how old or well used yours are but just an idea:

View: http://www.youtube.com/watch?v=NsJGvP--3UI

 

[ian emmerson]

That's a great help and thank you.
Earlier I gave the rotor a quick rub down with fine wire wool which improved things slightly and in the morning I will follow your advice.

Thank you again