I didn’t think about types of pads between the two, but I’m sure it is contamination. I just don’t know how each time I replace them they keep getting contaminated.
Have you considered the organic Swisstop Disc 34RS? Just bought a set for my DA callipers, reviews look great for mixed conditions and rotor wear. Yet to test them out but will report back once fitted and bedded in
Interested to see how these work.
Last year, I did, but it took my old bike shops too long to have them delivered. How do they feel compared to Shimano’s brake pads?
Old MTB trick is to cook your pads - take them out and hold them with pliers over a gas hob. It can, but not always, burn off the impurities. Take care though. Then a quick wipe with clean glass paper, clean your rotors and maybe roughen with some new wet and dry and you should be OK to bed in again. If they squeel after that it may be new pads time.
I had the RS505s and R785 calipers with a, 105 5800 group set. After a couple of years they started squeeling - one of the ceramic pistons had a leak around it so kept contaminating the pad on one side. And I have heard that they can sometimes crack.
I now use Ubber Pads - the race matrix ones and they work well. Good if you’re in the UK. And far cheaper than shimano.
By the way, it seems I have solved the riddle: the L03As are really an update to the L02As. On the box there is a big (virtual) sticker, informing me that they are using a new resin that has “+40 % wear-resistance”. I thought I’d add, perhaps it’ll be useful to someone in the future.
PS I don’t know yet whether they actually are any better, but at least that solves my mystery.
So I’ve bedded in the Swisstop Disc 34RS pads and they’re awesome! No noise at all and the stopping power is immense. I’ve done a couple of rides in the mountains with them and they have a great feel, I’m very impressed.
Saying this I did think that the Shimano pads were very good too and didn’t really have any issues with them although they did squeal a lot. Haven’t had that yet with the Swisstop but time and weather will tell!
One possible explanation is that your road bike calipers are not perfectly aligned. A knock getting a wheel in and out of the frame can throw off alignment, it may have been knocked out of alignment in shipping from the factory and not properly checked by your LBS when assembled, or taken a knock from falling over being bumped somewhere. On my wife’s older MTB with cheaper mechanical brakes, I’ll have them perfectly lined up when adjusting them, but if I torque one bolt too much while the other is loose, the caliper will tend to rotate a bit with the bolt. If it is off center just a touch, the brakes won’t drag, but will contact the rotor with opposite corners of the pads, wear faster and be more prone to heating and rapid wear.
How has the Swisstop Disc 34RS pads held up during the wet? Looking to solve some squeal from my Shimano…
Stopping power is great in the wet. Still haven’t found a pad that doesn’t go squeally in those conditions yet!
Sweet, my pads now sound like I am strangling a pig when braking the wet, nice way to get some attention in a group ride… So would want to try some other pads to at least minimise it…