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Old 04-02-2012, 06:24 PM
JeffH JeffH is offline
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Join Date: Dec 2011
Location: Atlanta, GA.
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Sumitomo Brake Pads

Question: Ever heard of anyone using Sumitomo Brake Pads for the Front Brakes on a 78' XS1100 E??

PO or somebody had put in Sumitomo A8K A21 66 in both front brake calipers. Could be maybe Sumitomo ASK A21 GG since it is a bit hard to see. Looks to me to be Auto Brakes and Google search doesn't give me much info.

PO had Bleed Screws loose but brakes still really ON..... It is difficult to move the bike around the garage with the brakes stuck. Rotor is centered in the Caliper on the right side, but Left rotor is dragging/scraping on the outboard side of the left Caliper body. What I'm seeing makes no sense.

Nothing looks bent or misaligned. Both Rotors are OK and would be all ripped up if the bike was actually ridden this way. Bleed screw on right was already loose so I removed the Bolts holding on the Calipers. Even with the bolts off and no pressure on the line the brake pads it still has a major bite on the brake rotor.

I ordered XS1100E Master Cylinder rebuild Kit and Caliper rebuild Kits today so I plan to get to the bottom of the puzzle. Maybe the Sumitomo A21's worked for a while then after they wore down a bit a retainer may have jumped or bent. Just wondering if anyone has any experience or info about the Sumitomo pads.

Thanks, Jeff
78' XS1100 E
78' XS1100 E
78' XS1100 E

'73 Norton 850 Commando
'99 Triumph Sprint ST
'02 G-Wing GL1800
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Old 04-02-2012, 06:33 PM
crazy steve crazy steve is offline
Join Date: Jan 2009
Location: Beautiful outer Yelm, WA
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I believe Sumitomo was OEM....
Fast, Cheap, Reliable... Pick any two

'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...

Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...
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Old 04-02-2012, 06:44 PM
natemoen's Avatar
natemoen natemoen is offline
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Join Date: May 2010
Location: Fargo
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The front end probably isn't aligned properly.

μολὼν λαβέ

1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
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Old 04-02-2012, 07:01 PM
JeffH JeffH is offline
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Join Date: Dec 2011
Location: Atlanta, GA.
Posts: 1,033
[quote=natemoen;365499]The front end probably isn't aligned properly.[/QUOTE

Yes, that might be it! If Sumitomo A21 was the OEM brake pad then that is not the issue. After further inspection I see the PO had not had the front axle off anytime recently. Rotors have never been off. Forks are not bent. If nothing is bent -and- the right caliper will not come off easily and the left rotor is scraping the caliper body; then misaligned forks is a top candidate.

This the is $450 "Save" bike I got in Louisville in January. I've rebuilt carbs and got the parts to r&r the petcocks arriving Friday. Bike seems to have had good dealer maintenance for a long time without any major PO hacking. Seems like just a few goofy things done in the last year or so as the bike was neglected and somebody tried to 'get her running'. So far, so good with the refurbishment. With the symptoms I've described, I think you are right about the whole front end alignment. The electrical tape in lieu of fork seal rubber covers might be an indication of what I need to fix next after R&R the Master Cylinders and Calipers.

Thanks, Jeff
78' XS1100 E
78' XS1100 E
78' XS1100 E

'73 Norton 850 Commando
'99 Triumph Sprint ST
'02 G-Wing GL1800
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Old 04-04-2012, 07:55 PM
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WSL91 WSL91 is offline
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Possible stuck piston in the caliper as well
1970? Honda Z50... gone
1974? Yamaha 100 Enduro... gone
1974 Honda CB200... gone
1981 Yamaha Virago 750... gone
1993 Honda Shadow 1100... gone
2008 Honda VTX 1800F
1982 Yamaha XJ1100J w/850 final, Raptor ACCT
1979 Yamaha XS1100SF "Chewey" Raptor ACCT

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