BrownhillsBob's #365daysofbiking

On a bike, riding somewhere. Every day, rain or shine.

Posts tagged ‘pads’

#365daysofbiking Don’t stop me now

March 4th – The front brake was feeling funny again, it had some initial resistance – like a click – when applied. I’d had it before but couldn’t recall the cause.

Turned out I discovered it riding to work when I lost braking power on the same brake. The pads were so worn, the return leaf spring was being pushed out of place by the disc surface.causing the click.

The pistons were opened back out with a wedge tool for the purpose and new pads dropped in. Braking harmony restored!

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#365daysofbiking Groovy, man

June 26th – Weeks of commuting in rain and grim weather are taking their toll on my brakes. Thinking I’d be in for a decent spell, I replaced the brake discs and pads on this bike in early spring.

Now it’s the end of June and they’re groovier than a 1970s Parisian jazz club.

The bikes are suffering: Corrosion, road grime, grit. This weather is eating my bikes.

A bit of sun and dryness isn’t too much to ask, is it?

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#365daysofbiking Feeling groovy

March 27th – The front brake has been quite noisy in recent days, and is juddering a little, yet the pads are fine.

A quick inspection in the bike shed at my destination showed the reason: The front disc it now severely worn and is starting top ripple on hard barking. The wear surface itself is about 60% of its original width.

A new disc will be about £25. Time to get one ordered I think. It’s seen some life, that one.

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#365daysofbiking Brake spring broke

February 5th – I have absolutely no idea at all what’s happened here at all.

It started at the weekend – a rubbing on the front disc brake on my current bike of choice. A light rub, no more that a tickle.

As the days progressed it got worse, and defied my attempts to adjust it away.

In exasperation, I removed the brake pads, which were OK at about 60% remaining.

The leaf spring that keeps them off the disc however, was broken. This was allowing on pad to rub.

An easy, 30 second replacement. But I’ve never had a spring fail like that that hasn’t been worn on the disc as the pad ran down.

This is most peculiar. I shall keep my eye on things in case it’s something significant.

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February 13th – I wore out a set of front brake pads, and still have a fair few part worn ones glazed out from the problems with the rear brake, which I wouldn’t throw away in case I found a way to reclaim them.

I’ve been thinking about it idly, and I’ve managed to recover a set. I filed off the surface a little with a clean flat file surface. Filing alone doesn’t work, so working on the basis whatever has destroyed them must be oil based, I took the pads, placed them on an aluminium sheet, and gently heated them with a very hot plumber’s blowtorch for ten minutes, until they stopped smoking when I removed the flame.

I then cleaned off the oxidisation with a scotchbrite pad and finally degreased them with a zero residue spray cleaner.

They are as good as new. Without the heat, none of these steps have worked before. 

I guess you could stove the pads in a normal kitchen oven if you don’t have a blowtorch.

It’s saved a few bob, I guess. Be interesting to see if they wear any quicker or glaze again.

September 3rd – It’s been a while since I bored you with disc brake pads, so it’s your lucky day – or maybe not.

I favour a hydraulic disc brake on all my bikes, road or off-road. On road bikes, I think the Shimano 785 based callipers are the bees knees; combined with a decent disc and pads, they control my resplendent girth down the steepest of inclines and without snatching.

The only issue I have – and I’ve covered this before – is the mystery of what exactly happens to rear pads in particular when they overheat. Sometimes, despite the best care, pads will develop a sheen, lose the nice grip and squeal horridly. I’ve been trialling aftermarket alternatives all summer to see if other manufacturer’s inserts are better.

I tried Kool Stop, an expensive brand. They were nothing special, and glazed out. Clarks performance was tepid, but lasted well. My best results have been with Uberbike sintered and semi-metallic. These are an interesting design – 785 road pads normally have a backplate with cooling heatsink fins. Uberbike have separated the two, so you can re-use the cooling fins on a slightly thinner pad, which are only £6 a set instead of the £20 for a set from Shimano. And they work a dream.I had one set glaze out near the end of life, but other than that, great.

I thought the front set had taken the same dive while winding down from the Roaches the day before, becoming squeaky and losing friction, so swapped them in the workshop the next day, to find the pads had worn to the spring, and that was the wail.

I really do recommend Uberbike pads.

February 23rd – Back to brakes. This has really caught my attention, sorry.

Following the brake trouble I’ve talked about where pads suddenly lose effectiveness in my hydraulic disc brakes, I’ve decided to try alternatives to the stock Shimano pads. 

I wasn’t expecting them to be any good – I was wrong.

I’ve tried the Kool-Stop first. This company makes a very highly regarded road brake block, and I was interested to see how that translated. After initial disappointment, I’m actually quite impressed.

These resin pads are described as having a ‘rotor saving compound’, which usually means they’re soft and not too effective. My fears seemed to be confirmed on the first two or three days of use, when stopping power was poor and the brakes noisy. 

I then rode in the rain. This appeared to bed the pads in and they’re now every bit as good as manufacturer originals in use. They aren’t quite as snatchy, which is good, to be honest, but they do bite when demanded.

The question is, how long will they last? We shall see. But my initial feeling is that although they took an age to bed in, they’re great pads.

February 18th – Brakes. Can’t keep stopping like this…

Thanks for all the suggestions for answers to the sudden loss of braking power issue. The disc is not greasy, the pads are dry and the disc is only 0.06mm down from new thickness – although that one really did make me think, so cheers for the suggestion.

I put in a set of Shimano pads. They worked fine once bedded in, without cleaning the disc. The old ones look glazed, and seems to be a grumble in online bike forums. 

I’ve decided to trial some aftermarket alternative pads to see how they fare in comparison – the red ones are Kool Stop, who are famed for old-style brake blocks, and the other set, with separate heatsinks are from Uberbike. The Kool Stops are at the pricey end of the market, the others, cheap. The interesting thing about the Uberbike ones is they come in synthetic, metal and semi-metal flavours, and you can buy the pad separate to the sink, so they’re cheaper.

Got the Kool Stops in for now. I’ll report back. Again, thanks for all the advice.

January 25th – It perhaps hasn’t become apparent yet to most folk, but to cyclists and those bound to the outdoors, this has been quite a grim winter. 

We’ve had far more frosts this year than last, and consequently, there’s been a lot more salt on the roads. The damp but not terribly rainy conditions have led to a corrosive, goopy, sticky road grime that coats the bike and is taking a steady toll, particularly on the wheels and brakes. 

Investigating a rub tonight, I noticed the corrosion on the disc pads, and the badly grooved disc. Aluminium parts are developing a familiar white bloom. There is surface rust on the exposed bare steel surfaces of pedals and bottom bracket.

When the weather clears, all this will need attending to. 

April 9th – Whoops. The bike I’ve been riding over the past few days has been having an issue with the front brake pats just lightly touching the disc. The noise was irritating me, so before I set out today, I got down to realigning the caliber, and then noticed the pads were a bit worn. Having spares on the bench, I whipped the old ones out.

Oh dear. The bad set, for those not in the know, are on the left, the replacements on the right. The pad on the one side is so worn, it’s to the metal, and the spring is mashed, too.

I also had an issue with the piston sticking. Hopefully that’s sorted.

Hydraulic brakes wear pads quicker. I must remember that.