2011 F800GS: Rear caliper not sliding

-BR-

-BR-

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Hi :)

Last night I attempted (!) to fit a new rear brake disc and pads to my F800GS. The disc replacement went fine but I hit issues getting the new (EBC) pads fitted - essentially the inside pad doesn't fit in the correct gap due to the caliper being slid to the outermost position. The bad news is that the sliding mechanism that adjusts the caliper position over the brake disc appears seized.

The rearmost caliper sliding pin looks to have some movement but the front one does not.

So I have two issues I would love some advice on:
- Any tips on getting that front sliding mechanism freed up - or on getting the rear caliper apart in general?

- Any tips on getting the rubber boot back on the rear slider assembly..i.e. through the hole and back onto the caliper sliding pin..

Appreciate any advice you may have.. :)
 
-BR- said:
Hi :)

Last night I attempted (!) to fit a new rear brake disc and pads to my F800GS. The disc replacement went fine but I hit issues getting the new (EBC) pads fitted - essentially the inside pad doesn't fit in the correct gap due to the caliper being slid to the outermost position. The bad news is that the sliding mechanism that adjusts the caliper position over the brake disc appears seized.

The rearmost caliper sliding pin looks to have some movement but the front one does not.

So I have two issues I would love some advice on:
- Any tips on getting that front sliding mechanism freed up - or on getting the rear caliper apart in general?

- Any tips on getting the rubber boot back on the rear slider assembly..i.e. through the hole and back onto the caliper sliding pin..

Appreciate any advice you may have.. :)
Click to expand...
Pull back the calliper sliding pin boots and squirt some Loctite freeze and Ease onto the sliding pins. Lever the calliper off the sliding pins and the calliper carrier.
 
Thanks Smug

I'm not anywhere near my bike - or Haynes manual today - can you confirm if there's any need to bleed the rear brake during any of this? Should I be able to separate the caliper and carrier normally by just releasing the brake pads? Apologies if this is an idiotic question....
 
Brake pressure has no bearing on the sliding mechanism (assuming you've removed it from the bike and the piston isn't moving against the disk of course!)
 
-BR- said:
Hi :)

Last night I attempted (!) to fit a new rear brake disc and pads to my F800GS. The disc replacement went fine but I hit issues getting the new (EBC) pads fitted - essentially the inside pad doesn't fit in the correct gap due to the caliper being slid to the outermost position. The bad news is that the sliding mechanism that adjusts the caliper position over the brake disc appears seized.

The rearmost caliper sliding pin looks to have some movement but the front one does not.

So I have two issues I would love some advice on:
- Any tips on getting that front sliding mechanism freed up - or on getting the rear caliper apart in general?

- Any tips on getting the rubber boot back on the rear slider assembly..i.e. through the hole and back onto the caliper sliding pin..

Appreciate any advice you may have.. :)
Click to expand...

Is the brake piston going completely flush with the caliper? I struggled with mine but I had forgotten in my haste to remove the rear reservoir lid to allow excess fluid back up as it was topped up to max (by dealer at last service:rolleyes:)
 
how do you lever off the caliper from the slider?
 
Just done this on my XCountry, before lunch

Some muppet (PO) had pulled the knurled knob end off the boot that covers the rear sliding pin:rolleyes:

So, I had to get another replacement (not available from BMW, BTW) and the XCountry caliper is same as many others - KTM 640LC4, Honda CB500 etc so I got a new boot cup kit, which is genuine Brembo, but in a KTM bag and as we have a Katoom dealer in town I got it from them for £12.50, including grease

I bet your rear caliper is the same one

If you want the Brembo and KTM parts no's let me know

To replace the boot, I took the wheel out and removed the pads, luckily mine is a low mileage bike and all the pins slid freely from the back plate - so I just pulled the caliper away, from the backing plate

If yours is stuck, use the method as described above, with freeze and ease or use Plus Gas

You'll probably destroy the rubber boots getting the caliper to slide, so you'll need new boots and maybe new slider pins - KTM can supply the pins or maybe Husky (think NUDA - same bike) - so you'll have to do a bit of research

New pins just either bolt to the caliper or backing plate, new boots are easy to fit - the rear most one needs a bit of light grease on the bellows end to slide through the caliper hole - put it on bellows end through the hole and gently 'tug' through with some long nosed pliers, then seat on the thin flange lip, near the bolt end - best to liberally grease naturally

Good luck
 
Smythson said:
As per JB's post plenty of places to get parts (boots etc) as BMW only supply the entire unit.
Click to expand...

BMW only list the caliper, for a fortune....................whereas KTM will supply seals/pistons/boots/slider pins etc to rebuild your caliper - all genuine Brembo parts, in a KTM bag

New rear caliper sliding pin boots, from KTM were £12, including new grease tube - not cheap but better than a seized caliper, I thought

WTF BMW can't supply the same BREMBO parts as KTM can, god only knows

Why would you want to buy a new caliper from BMW, when it's all rebuildable....................boils my piss
 
JohnnyBoxer said:
BMW only list the caliper, for a fortune....................whereas KTM will supply seals/pistons/boots/slider pins etc to rebuild your caliper - all genuine Brembo parts, in a KTM bag

New rear caliper sliding pin boots, from KTM were £12, including new grease tube - not cheap but better than a seized caliper, I thought

WTF BMW can't supply the same BREMBO parts as KTM can, god only knows

Why would you want to buy a new caliper from BMW, when it's all rebuildable....................boils my piss
Click to expand...

With you there - i nearly keeled over when they quoted the caliper price! Particularly as the caliper has been in production so long i could get the boots from a new old stock specialist!
 
For a BMW 650 Single or XCountry/Challenge/Moto, with Brembo rear caliper and more than likely the F800GS/650Twin with Brembo rear caliper

Rubber Boots (Cups) for Brembo Rear Caliper Slider Pins

KTM # 5461 321 8000

Brembo # 98.5032.60
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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