Brake issues

Rrawlings · 16-06-2019, 10:58 AM

I’m back again with more tales of misery. After the shock debacle and flipping the calliper to bleed the back brake after stripping it down the back brake is still sticking. There’s free play at the pedal but starting to get annoying when you can’t wheel the bike around when it’s warm and it stopping when you roll up to traffic lights.

Master cylinder time?

Also are the discs for the front same on an 1100s as they are on an evo? Can get some cheap but shop says they are for an s

Cheers

slob · 16-06-2019, 11:08 AM

more pedal free play, you might be lucky and not have ruined anything yet. fingers x-ed

s with ohlins forks will have different offset (caliper spacing)

std 1100 & evo might be the same but galfer part #s different so not 100% sure

Chriswilly · 16-06-2019, 11:22 AM

Bleeding the rear brake is a pain because the master cylinder is above the filler - needs to be taken off with the caliper and held in the correct order so that the fluid route is master cylinder below the caliper - or use a pressure bleeder.

Think that's right!

slob · 16-06-2019, 11:46 AM

he knows chris, he’s been there. overheating/binding issue different

Luddite · 16-06-2019, 12:21 PM

Slob's right on both counts (of course!). The offset for the S discs is different from the Evo's. I changed my front discs 18 months ago and researched the alternatives then. A pair of stock discs was about £480 and the RRP for Brembo Serie Oros was around £440. But I got a pair from Simon at WSC Performance for £285 delivered. He also supplied two pairs of SA sintered pads for £54. Give him a try - full contact details here:

http://www.ukmonster.co.uk/monster/s...ad.php?t=56141

As for the rear brake, it's quite common for it to be weak due to air in the system and it's also not unusual for owners to try to compensate by winding in the adjuster. That could be what the previous owner did on yours so that, now you've got it working as it should, it's now got insufficient clearance. If you've stripped and cleaned the caliper (and changed the seals) then that shouldn't be the source of the binding so, as slob says, try backing off the pushrod a bit.

Also, make sure the reservoir isn't overfull - too much fluid may not leave enough space for expansion when the system heats up.

Let us know how you get on.

Rrawlings · 16-06-2019, 12:47 PM

I don’t need the discs they are just cheap so thought I’d get them for spares.

So back brake

I’ll get some more free play in it and try that however lifting the seal a little shows a rather nasty looking push rod that might need fettling up too

slob · 16-06-2019, 01:00 PM

if you don’t spot it in time you wreck the disc & caliper too, so at least you’re on the case

Rrawlings · 16-06-2019, 04:04 PM

Well I’ve got as much free play as possible without taking the pedal off! Couldn’t test it though the rain returned. I’ll try again one evening this week. If the free play doesn’t work I’ll get a new master

Luddite · 16-06-2019, 04:19 PM

Quote:

Originally Posted by Rrawlings

If the free play doesn’t work I’ll get a new master

Hopefully, it won't come to that but, if you do need one (62540041A), give Craig and Luke a ring at Moto Rapido (01962 873981) where you'll get a UKMOC 10% discount. It should come in at just under £50 posted.

Rrawlings · 18-06-2019, 09:00 AM

Set off this morning to work and all was good then started hitting slow traffic and the free play disappeared and then the brake started sticking again. Got moving at a decent speed again so bike cooled down and it was free as a bird at the next junction I pulled up at. So does it sound like still air in the system or should I get a master cylinder? I could have sworn that the bleeding was good and was free of air but I guess I could be wrong. The fluid level is halfway to allow for expansion just in case too

Darkness · 18-06-2019, 11:47 AM

Quote:

Originally Posted by Rrawlings

Set off this morning to work and all was good then started hitting slow traffic and the free play disappeared and then the brake started sticking again. Got moving at a decent speed again so bike cooled down and it was free as a bird at the next junction I pulled up at. So does it sound like still air in the system or should I get a master cylinder? I could have sworn that the bleeding was good and was free of air but I guess I could be wrong. The fluid level is halfway to allow for expansion just in case too

To me that sounds like water in the system, boiling when hot and pressurising the system.
Have you changed/topped up the fluid recently, and was it from a new sealed (Unshaken) can?

Rrawlings · 18-06-2019, 11:52 AM

yeah brand new bottle went through several reservoirs full

Rrawlings · 18-06-2019, 04:15 PM

Got another bottle of brake fluid on my way home then spent forever bleeding half a litre through. Seems ok but will see

Luddite · 19-06-2019, 09:49 AM

Hope you get this sorted soon, Ryan.

The only other thing I can think of that could cause the binding would be a blocked bypass port in the master cylinder not allowing the pressurised fluid back into the reservoir.

The port is pretty small so any debris in the reservoir or corrosion in the master cylinder can block or restrict it.

Rrawlings · 19-06-2019, 12:31 PM

Me too Vince it’s starting to really annoy me. The bypass could be a good shout if I’m honest as it took some work to get the pistons back in when I was messing around checking the piston movement yesterday. I’m hoping to use it for my short work commute tomorrow to see if there is any progress. If not I’ll get the master then give the whole back brake system another going over

16-06-2019, 10:58 AM	#1
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	Brake issues I’m back again with more tales of misery. After the shock debacle and flipping the calliper to bleed the back brake after stripping it down the back brake is still sticking. There’s free play at the pedal but starting to get annoying when you can’t wheel the bike around when it’s warm and it stopping when you roll up to traffic lights. Master cylinder time? Also are the discs for the front same on an 1100s as they are on an evo? Can get some cheap but shop says they are for an s Cheers

16-06-2019, 11:08 AM	#2
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,708	more pedal free play, you might be lucky and not have ruined anything yet. fingers x-ed s with ohlins forks will have different offset (caliper spacing) std 1100 & evo might be the same but galfer part #s different so not 100% sure Last edited by slob; 16-06-2019 at 11:14 AM..

16-06-2019, 11:22 AM	#3
Chriswilly Registered User Join Date: Sep 2012 Location: gloucester Bike: M900ie Posts: 133	Bleeding the rear brake is a pain because the master cylinder is above the filler - needs to be taken off with the caliper and held in the correct order so that the fluid route is master cylinder below the caliper - or use a pressure bleeder. Think that's right!

16-06-2019, 11:46 AM	#4
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,708	he knows chris, he’s been there. overheating/binding issue different

16-06-2019, 12:21 PM	#5
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	Slob's right on both counts (of course!). The offset for the S discs is different from the Evo's. I changed my front discs 18 months ago and researched the alternatives then. A pair of stock discs was about £480 and the RRP for Brembo Serie Oros was around £440. But I got a pair from Simon at WSC Performance for £285 delivered. He also supplied two pairs of SA sintered pads for £54. Give him a try - full contact details here: http://www.ukmonster.co.uk/monster/s...ad.php?t=56141 As for the rear brake, it's quite common for it to be weak due to air in the system and it's also not unusual for owners to try to compensate by winding in the adjuster. That could be what the previous owner did on yours so that, now you've got it working as it should, it's now got insufficient clearance. If you've stripped and cleaned the caliper (and changed the seals) then that shouldn't be the source of the binding so, as slob says, try backing off the pushrod a bit. Also, make sure the reservoir isn't overfull - too much fluid may not leave enough space for expansion when the system heats up. Let us know how you get on.

16-06-2019, 12:47 PM	#6
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	I don’t need the discs they are just cheap so thought I’d get them for spares. So back brake I’ll get some more free play in it and try that however lifting the seal a little shows a rather nasty looking push rod that might need fettling up too

16-06-2019, 01:00 PM	#7
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,708	if you don’t spot it in time you wreck the disc & caliper too, so at least you’re on the case

16-06-2019, 04:04 PM	#8
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	Well I’ve got as much free play as possible without taking the pedal off! Couldn’t test it though the rain returned. I’ll try again one evening this week. If the free play doesn’t work I’ll get a new master

18-06-2019, 09:00 AM	#10
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	Set off this morning to work and all was good then started hitting slow traffic and the free play disappeared and then the brake started sticking again. Got moving at a decent speed again so bike cooled down and it was free as a bird at the next junction I pulled up at. So does it sound like still air in the system or should I get a master cylinder? I could have sworn that the bleeding was good and was free of air but I guess I could be wrong. The fluid level is halfway to allow for expansion just in case too

18-06-2019, 11:52 AM	#12
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	yeah brand new bottle went through several reservoirs full

18-06-2019, 04:15 PM	#13
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	Got another bottle of brake fluid on my way home then spent forever bleeding half a litre through. Seems ok but will see

19-06-2019, 09:49 AM	#14
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	Hope you get this sorted soon, Ryan. The only other thing I can think of that could cause the binding would be a blocked bypass port in the master cylinder not allowing the pressurised fluid back into the reservoir. The port is pretty small so any debris in the reservoir or corrosion in the master cylinder can block or restrict it.

19-06-2019, 12:31 PM	#15
Rrawlings Member Join Date: May 2019 Location: Bradford Bike: M1100evo Posts: 175	Me too Vince it’s starting to really annoy me. The bypass could be a good shout if I’m honest as it took some work to get the pistons back in when I was messing around checking the piston movement yesterday. I’m hoping to use it for my short work commute tomorrow to see if there is any progress. If not I’ll get the master then give the whole back brake system another going over