New front pads, brakes now binding.

[Robh1664]

R1100GS 1998 ABS (22000 miles)

I just fitted new pads and having pushed back the pistons, and refitted the calipers, I pumped up the brakes and now the disc is binding (not a new experience on an older bike).

I'm going to strip and clean the calipers, but does anyone know if my pistons are lightly to have corroded, or is it just going to be dirt making them stick. I'll find out when they are pulled apart , but I'd like to order up parts first. Just seals or seals and pistons ?

Any advice greatly appreciated, as ever !

 

[Slipperyeel]

An outside thought but have you checked the reservoir isn't overfull now that you've pushed them back in?

Last question would be is it still on the original rubber hoses? If yes, maybe you've disturbed the fragile interior and now they're blocked!

Someone else with be along with better ideas soon!



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[Micky]

1998? then your Pistons have every possibility of being corroded

Did the Pistons push back in easily enough? Where was the fluid level before you started work? Where is it now? Every possibility you might just need to take the cap off and refit!!

Rear brake .... MUST have some free play in the pedal before the rod starts to contact the piston and push it up!!!

 

[Robh1664]

Didn't think to check reservoir level. I'll take a look Monday if it's not that......it's pullum' apart time. . The bike has goodridge hoses fitted.

I'm going to strip them before ordering any parts. Not going to be cheap if it's new pistons.

At least the weather is s**t, so not missing riding so much !

 

[Micky]

Didn't think to check reservoir level ....

.... and you're fitting new pads?

Best let someone do the job that knows what they're doing then

 

[Robh1664]

Ha, I get what your saying Micky. To be fair, the pistons were only pushed in about one mill. I could have left the old pads in.
I've fitted Gold Fren pads. They have been fine in all my other bikes , but they are quite thick. Not much room for the disc.

 

[mspenz]

Just had this myself. Take the pads out and pump the pistons out a reasonable amount but not fully, good chance that you will see something starting to push out the side of the piston and if you do it's the rubber scraper ring trying to make a bid for freedom!
Corrosion builds up behind the ring and it starts to get pushed out a little resulting in the piston having to push past a piece of rubber that is trying to fold over, I took the pistons out and managed to salvage the rings as I can't get the seals separately (Tockinco only sell piston and seal kits combined) but you should be ok with the 1100 callipers.
Try Motorworks or Powerhouse for kits...and ditch those Goldfrens

 

[Ash]

Put the old pads back in...

Simples

 

[Steptoe]

I've fitted Gold Fren pads.

That's your first mistake....


Try loosening the calipers and then levering the pads in and out a few times and then retightening the calipers... Usually works.

 

[Slipperyeel]

Put the old pads back in...

Simples

I think this sounds like your answer

I'm just not clear why you decided to replace them if they had so much meat left on them?


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[Robh1664]

I'm going to have a look tonight and sort it. The pads on both calipers had worn more on one side than the other. Can't remember which side. So something's not right. Thanks for the advise. I'll post up my findings tonight. Got to go do some work now and stop skiving.

 

[Steptoe]

The pads on both calipers had worn more on one side than the other.

Pretty much the norm with BMW's.

 

[Robh1664]

Argh BO**OX, the pistons are corroded. I'll order some new ones (inc. seals).

And to think, I nearly bought a late model 1200GS. But even with limited use so far, I love my 1100.

Cheers all.
Rob.

 

[Karlread]

You can get the kits from Motorworks, I had to do both front calipers on my R1100RS this year. Kits together are just short of £100!

 

[Robh1664]

I'm going to do that tomorrow Karl. It's a bit of a juggling act to get all the pistons out just far enough to free the stuck ones. G clamps, tyre leavers and bits of wood.........sorted.

I hope this all helps some other folks on here and I apologize to those that have heard it all before

 

[Karlread]

Try and get the old ones out as far as you can by pumping the lever, otherwise it can be a tad tricky to say the least. I found out the hard way.....
I would also suggest a can of Wurth brake cleaner unless of course you already have one. Just the job for a Sunday afternoon, have fun!

 

[Robh1664]

All done. No binding.

There was corrosion on 3 pistons, but the main problem was corrosion behind the dust seals, the white fur of doom. I scraped it out, cleaned and fitted a complete Moto Bins (BMW) kit to each caliper (all seals and pistons). The bleeding of the brakes was not straight forward, but I got there in the end.

What a difference.

 

[Ash]

We do like a happy ending

 

[Karlread]

Well done, bike should feel a lot slicker now and you shouldn't end up with warped discs!

 

[stuart kerr]

Sorry for stating the obvious but this highlights to me the importance of giving the brake callipers and thorough clean during servicing


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