Disc Brakes and Pads

Sierratim

Well-Known Member
Region
USA
City
Nevada City, CA & Paradise Valley, AZ
Semi-metallic ones. I might also look to Kool-Stops to accumulate different pads for my stock.
My semi-metallic pads are giving me great life compared to my original organic pads. I did need to bed them in to get them to quiet down. I clean them and the rotors with alcohol if I get any additional noise from them.
 

Sierratim

Well-Known Member
Region
USA
City
Nevada City, CA & Paradise Valley, AZ
I did a 1,000 mile checkup on my semi-metallic Kool Stop pads today. As I noted in post #10 in this thread, at 500 miles these pads had an average wear of 0.05mm as compared to a new pad as measured on the faster wearing front pads. I removed and cleaned both front and rear pads today and again measured the thickness of the front pads. The average wear was 0.13mm, and increase of 0.08mm from the 500 mile mark. I'm sure the increased wear was due to the river canyon rides I did through the summer with their steep descents.

None the less, these new pads are on track to last well over 2,500 miles, a very nice improvement over the original organic pads that had to be replaced at 500 miles.

I did note that the rotors had a slight blueish tint now. My sons tells me this is common for their MTBs being caused by high temps from braking during long descents. Gotta love those aggressive heat sinks on these Kool Stop pads!

0402201211a_Film1_20200403071806566.jpg
 

FlatSix911

Well-Known Member
Region
USA
City
Silicon Valley
I did a 1,000 mile checkup on my semi-metallic Kool Stop pads today. As I noted in post #10 in this thread, at 500 miles these pads had an average wear of 0.05mm as compared to a new pad as measured on the faster wearing front pads. I removed and cleaned both front and rear pads today and again measured the thickness of the front pads. The average wear was 0.13mm, and increase of 0.08mm from the 500 mile mark. I'm sure the increased wear was due to the river canyon rides I did through the summer with their steep descents.

None the less, these new pads are on track to last well over 2,500 miles, a very nice improvement over the original organic pads that had to be replaced at 500 miles.

I did note that the rotors had a slight blueish tint now. My sons tells me this is common for their MTBs being caused by high temps from braking during long descents.
Gotta love those aggressive heat sinks on these Kool Stop pads!

View attachment 69841
Congrats... the blue tint on the rotors is a badge of honor around here! ;)
 

Igor M

Member
Region
Europe
There seem to be no restrictions resulting from your rotor model so various 4-piston-brake pads should fit your TRP Zurich as well:
TRP Q12RS (resin pads), TRP Q15TS (sintered metal), TRP Q10TS (full-metal, old type), Galfer FD426 advanced G1851, Galfer FD426 standard G1053.
Hi,
I have the same brakes as Stefan, so I want to order a pair of spare pads. Does the SHIMANO SAINT ZEE D03S fit? They are easily accessible to me.
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
Hi,
I have the same brakes as Stefan, so I want to order a pair of spare pads. Does the SHIMANO SAINT ZEE D03S fit? They are easily accessible to me.
I wouldn't take the risk.
See this online store:

I strongly recommend the store. I hope they can send the brake pads to your country. If not, send me a private message, Igor.
P.S. Buy at least 4 sets. It is very hard to buy anything now.
 

TS25

Well-Known Member
Region
Europe
I have the same brakes as Stefan, so I want to order a pair of spare pads. Does the SHIMANO SAINT ZEE D03S fit?
They are intended for Shimano brakes so they won't fit.
The shop linked by Stefan sends to BiH but postage is 14.99 €.
 

steve mercier

Well-Known Member
I did a 1,000 mile checkup on my semi-metallic Kool Stop pads today. As I noted in post #10 in this thread, at 500 miles these pads had an average wear of 0.05mm as compared to a new pad as measured on the faster wearing front pads. I removed and cleaned both front and rear pads today and again measured the thickness of the front pads. The average wear was 0.13mm, and increase of 0.08mm from the 500 mile mark. I'm sure the increased wear was due to the river canyon rides I did through the summer with their steep descents.

None the less, these new pads are on track to last well over 2,500 miles, a very nice improvement over the original organic pads that had to be replaced at 500 miles.

I did note that the rotors had a slight blueish tint now. My sons tells me this is common for their MTBs being caused by high temps from braking during long descents. Gotta love those aggressive heat sinks on these Kool Stop pads!

View attachment 69841
I told you they were the real goods! (-: Same goes for the Sram 11 speed chain pc XX1 ... everybody should try one if it fits your bike.
 
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Igor M

Member
Region
Europe
I wouldn't take the risk.
See this online store:

I strongly recommend the store. I hope they can send the brake pads to your country. If not, send me a private message, Igor.
P.S. Buy at least 4 sets. It is very hard to buy anything now.
Thanks everyone.
I ordered 2 pairs from this site.
 

GuruUno

Well-Known Member
As per Sierratim and his positive review of the KS-D635K pads, I ordered new pads (AERO Kool Disc KS-D635K) which I'll install tomorrow.
My existing OEM supplied pads which I changed to new SHIMANO J03A Resin Disc Brake Pads at 2300 miles, not that I needed to, but I was doing a bunch of other updates, new cassette, new chainring, new chain, new tires, etc., etc., I figured hey, why not new pads.
Nonetheless, they (I feel) were "bedded" correctly, but the front brakes squeal like a pig and I have been using them as an alert/sounding device (horn) when I come into an intersection where others are not acknowledging the sharing of the road, etc....... which I may miss.... :) Weird, the back ones are 100% silent.
So, after reading in-depth the discussions here, I figured Sierratim knows his stuff, so I got the pads he says are meeting his expectations, so I'm following his suggestion to try them out.
They are about the same price.
Oh, yesterday while on a group ride, someone said to take the pads and soak them in boiling water to fix the squeal.....does anyone have a comment on that?
 

Attachments

  • AERO Kool Disc KS-D635K.jpg
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GuruUno

Well-Known Member
So, got the new pads but did not do yet....wanted to do one last try to clean up the other "new" pads & rotor with alcohol, etc., still a no-go.
Looks like good weather this weekend, will report if good or bad.
Last case scenario, got new rotors in the event they may be the 'squealer'
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
Last case scenario, got new rotors in the event they may be the 'squealer'
Don't replace rotors without real need. Replace the pads only if the old ones are worn. One of the reasons of brake squealing is uneven action of pistons. Besides, hydraulic disk brakes may squeal.
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
I didn't read carefully. Semi-metallic pads? They do squeal. Organic ones don't unless worn.
 

GuruUno

Well-Known Member

SHIMANO J03A RESIN DISC BRAKE PADS-what I initially used​

Blurb that educated me [or confuses me?]
"Organic pads, also known as semi-metallic or resin pads, are made of a much softer compound. This means that the pads will be quieter and will certainly not last as long as metallic pads. A major concern in using resin pads is their ride characteristics in wet conditions. Organic pads should not be used in wet conditions because they will offer very little, if any, braking power once wet. Organic brake pads will offer more initial bite during braking, but don’t deal with heat as well as metallic pads. Resin pads will fade faster than metallic pads on long descents and under heavier riders".

I read that to be Organic pads are semi-metallic and/or resin pads.
So then, if they are semi-metallic, they squeal, right?
 

steve mercier

Well-Known Member

SHIMANO J03A RESIN DISC BRAKE PADS-what I initially used​

Blurb that educated me [or confuses me?]
"Organic pads, also known as semi-metallic or resin pads, are made of a much softer compound. This means that the pads will be quieter and will certainly not last as long as metallic pads. A major concern in using resin pads is their ride characteristics in wet conditions. Organic pads should not be used in wet conditions because they will offer very little, if any, braking power once wet. Organic brake pads will offer more initial bite during braking, but don’t deal with heat as well as metallic pads. Resin pads will fade faster than metallic pads on long descents and under heavier riders".

I read that to be Organic pads are semi-metallic and/or resin pads.
So then, if they are semi-metallic, they squeal, right?
Those new KoolStop pads you have will not squeek unless it is raining out. If they do squeek when it is dry out , I would suggest you check carefully for a small fluid leak on the affected brake.
 

Stefan Mikes

Well-Known Member
Region
Europe
City
Brwinów (PL)
I read that to be Organic pads are semi-metallic and/or resin pads.
No. Organic are made of resin, semi-metallic are sintered.
I think Steve's right but I guarantee the semi-metallic pads will squeal on long hard braking downhill. Listen guys to some EMTB videos; I experienced that in the mountains on two different e-bikes.