Author Topic: Replacing ST1300 front brake pads  (Read 2564 times)

Offline Biggles

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Replacing ST1300 front brake pads
« on: April 12, 2013, 01:18:23 PM »
It's raining, so I decided to bite the proverbial bullet and change the ST13's front brake pads.  I'd done the rear ones nearly 30,000 kays ago (just shows how much more I use the rear than the front, bearing in mind the front does 70% of the stopping effort).  The rears are pretty easy, and I did them without removing the caliper.  There are "how to's" for that elsewhere (also for the front, but I want to tell my story).

There was no way I could push the pistons back, try as I might, so I looked at what removing the calipers involved.  Two bolts- not rocket science, but the disclaimer on the pad's packing says "Do not attempt to fit this product if you are not a fully qualified mechanic".  Well I'm over qualified, being a bush lawyer as well as a bush mechanic, so let's stop wasting time...

Before committing to the enterprise, you'll need to have a long handled (for leverage) 6 mm Allen key, and an 8 and 12 mm socket or spanner.
I did the right side first.  I pulled the 8 mm bolt to drop the pads.  They were at 1.5 mm, just below the recommended 2 mm, so I wasn't getting in early on this job!

Removing the two caliper bolts is easy, then with due care for the flexible hoses, I turned the calliper and checked the pistons for corrosion and deposits. 

Top article here on cleaning pistons:
http://www.st-owners.com/forums/showthread.php?101206-ST1300-Rear-Brake-Piston-Cleaning

Then I used the socket spanner handle to ease the pistons back flush with the caliper and installed the new pads.  The inside one was very reluctant to seat, but I won the battle.  As is always the case, I lost the next battle.  There was no way in creation the pads were going to fit over the disk.  I have the "Metal Gear" pads and they have a 1.5 mm plastic packing under the perforated backing plate.  The originals don't have that, so I figured the packing must be for another type of caliper and removed it.  The pads would then fit over the disk.  If anyone knows better about this feel free to contribute.



It takes two full strokes of the brake lever to reset the pads.  I think it wise to do it to the first side before removing the other side or you might overflow the reservoir.

Reassembly from there was easy.  The left hand side is mounted differently, using the Allen key type bolts.

Luckily the rainy day came when it did, otherwise I might have done what I did to my poor ST11 when the pads wore down to metal.  I'm sure that accelerated the disk wear to the point they needed replacing at 130,000 kays.
For the modern man who lives in the city, riding a bike might be one of the only ways to escape the humdrum monotony. To take off and ride. To be both at one with nature and one with the bike. To feel masculine. Adam Piggott

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Offline Biggles

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Re: Replacing ST1300 front brake pads
« Reply #1 on: April 14, 2013, 03:08:27 PM »
Today was the first chance I've had to test the new brakes.
First impression was just how good they are!  When I did the back with the same sintered pads they were very poor for a hundred or so applications before they got back to normal.  The front ones were like new straight away.

Second impression: WHY IS THE FI LIGHT ON?  And where's Whizz the engineer when you need him?

So stopped the engine and did a restart- re-boots usually work.  Light still came back on.
Oh well- fortune favours the brave- off to the shops to see what happens.
On the restart after shopping, no FI light and still top brakes.
Whew!

It seems it doesn't take much to upset the ECU.  I could understand if the ABS was stroppy after my pulling the calipers, but not the FI.
Anyhoo, hopefully it's got over the sulks and we're friends again.

One other observation.  If you're going to do this, pump the back brake after you do the front after the install.  I got a bit of a fright when the rear brake was very soft on the first application.  All to do with the linked brake system, obviously.
For the modern man who lives in the city, riding a bike might be one of the only ways to escape the humdrum monotony. To take off and ride. To be both at one with nature and one with the bike. To feel masculine. Adam Piggott

OzSTOC #16  STOC #6135  FarR #509  IBA #54927
 

Offline Diesel

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Re: Replacing ST1300 front brake pads
« Reply #2 on: April 14, 2013, 09:06:55 PM »
Thanks mate - great info.

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