Improving Cable Disc Brakes

[Beyond Rational]

If the budget is £50, pop a hydro on the front and leave the back.

[The Walrus]

Cheers again for all the advice, I gave the brakes a check over at the weekend and found that the pads where pretty worn, I thought they would have been ok as up to now I had not used the bike much and had only started to pile the miles on over the last 2 months so chucked a new set on the front and cleaned the discs to see if that would help and hey presto good as new.

Still squeal like a pig which is doing my nut in so may invest in a hydro front and rear now that I have a bit of extra cash spare this month.

[rhinochopig]

The Walrus said:

Cheers again for all the advice, I gave the brakes a check over at the weekend and found that the pads where pretty worn, I thought they would have been ok as up to now I had not used the bike much and had only started to pile the miles on over the last 2 months so chucked a new set on the front and cleaned the discs to see if that would help and hey presto good as new.

Still squeal like a pig which is doing my nut in so may invest in a hydro front and rear now that I have a bit of extra cash spare this month.

Did you copper slip the back of the pad check the pad alignment. Did you check the disc bolts? Both of these can cause squeal.

[The Walrus]

I took apart front and rear and checked for any gunk but both operated fine and only had a minor amount of build up which I cleaned out, the calipers are very basic and only push from one side and look like they have warped the disc's very slightly.

As for copper slipping I did not have any to hand but will pick something up over the weekend, on the adjustment I could not find anything on line or in the shimano website on how to do this or if it is even possible with the set up I have.

See link below for the details I can find.

http://techdocs.shimano.com/media/techdocs/content...

[rhinochopig]

Item 3 on your instructions.

[The Walrus]

Meant to say already adjusted those two at either the pad or at the cable. front is fully out and still rubs so will just have to wear the pads down a bit.

[rhinochopig]

The Walrus said:

Meant to say already adjusted those two at either the pad or at the cable. front is fully out and still rubs so will just have to wear the pads down a bit.

That's maybe your problem then. Is the calliper clamp shimmed at all (section 1)? What may be happening is that pad pressure is not balanced, which is causing the squeal. Some disc set-ups use shims to centre the calliper onto the disc - Hopes for example. Ideally, like V brakes, the distance between the pad and the braking surface should be as equal as possible on both sides

I've never used these types of disc before, so it's difficult to help without actually seeing them in the flesh.

One other thing, if your disc is warped, you can use a set of mole grips on the braking surface to true them. (you can get truing tools, but mole grips will do TBH)

Instructions how - here http://www.utahmountainbiking.com/fix/diskrotortru...

I tend to do it by eye rather than faff around with a DTI.

Edited by rhinochopig on Friday 30th April 13:35

[The Walrus]

There may be a shim on the caliper if that is what you mean will have to look and let you know.

Is this the diagram you mean



Or this one ?

[rhinochopig]

Both - the components labelled calliper clamp bolt *may* have shims between the calliper clamp and the frame/forks. The number of shims fitted allows you to centre the calliper.

[The Walrus]

That makes sense I will check an adjust if I can.

Thanks for all your help you have been a fountain of knowledge.