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Post by metalforever on Apr 16, 2009 20:20:33 GMT
My rear brake has been appauling lately, as of the last 100-150miles. So whilst i had my front tyre off getting it changed i took the opportunity to clean the callipers, VERY glad i did. What a state! Nipped seals front and rear and the amount of dirt build up was unreal. The front had a seized piston but very healthy pads, the rear was both partially siezed and wouldnt move more than 2mm! This is what shocked me most... Both pads, obviously not healthy but not the worst ive seen.  Left pad, not ideal but has a couple hundred miles left on it yet...  Right pad, Jesus. I havent even seen pads this bad after a season of racing the 600!  Absolutly NO meat left on it.  First impressions where the pistons were draggin against the disc, but this wasnt the case. Then i thought maybe my disc was warped, nope, not the case. Wondered if i'd been using it excessively, but i rarely even use the brakes appart from the final part of coming to a stop and sitting still. Im guessing they must have been pretty low when i bought the bike but its worrying to think they are this bad! Im ordering some new pads and seals ASAP whilst i give the bike its first complete service in my ownership. |
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Post by amorti on Apr 16, 2009 20:40:55 GMT
I let my last set of rears get to about that point. Quite consciously, monitoring their progress every week at the weekly scrub-up. I finally changed them when I had the exhaust off at one point. Go to wemoto and get their £10 specials from Kyoto. Performance is surprisingly enough very good in the 600's rear. For the front caliper (don't know about the rear) they also keep OE Yam seals in stock, so you can get it all in one place  Don't be tempted by pattern brake seals, it's a recipe for doing it again sooner than you wanted to. |
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Post by pilgrim on Apr 16, 2009 21:07:01 GMT
I don't know what to make of this amorti! You run down the 'wooden' front brake of the Divvy and then say you let your rear pads get as bad as this!!!!!!! C'mon old chap, where's the sense in that, if you don't keep your bike in roadworthy condition, KNOWINGLY!!!  Big question mark! |
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Post by mickandrita on Apr 16, 2009 21:37:04 GMT
I replaced my 900 pads with EBC HH series pads and they made a real difference to the feel and stopping power well worth the extra cost imo
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Post by amorti on Apr 16, 2009 23:00:48 GMT
What's not roadworthy about that? It was working fine, a;though the pads were thin. Here's my favourite photos of a pair of EBC HH pads I found in the rear caliper of my old CB-1 when going for a bit of winter preventative. My dad had a pair do exactly the same, too. And that was nothing to do with poor maintanence before any of you burgers suggests it - look how thick they are!   |
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Post by CD on Apr 17, 2009 7:22:03 GMT
If I remember correctly both brakes were fine when you bought the bike and you were offered a set of genuine Yamaha seals and some brake pads. I can't remember if you took them.
The pads pictured look worn out and ready for replacement and look like they were taken from a (more or less) correctly working brake. If there was anything seriously wrong, the pads wouldn't have worn so evenly. As you say, they are now ready for replacement. The last 150 miles shows it's important to listen when your bike talks to you.
Work the pistons in and out, etc. With pistons pushed in, remove the outer seals and clean out the grease/crud. Regrease with proper red grease and replace the seal. This is normal procedure for any Japanese bike brake when its time for new pads.
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Post by metalforever on Apr 17, 2009 7:27:25 GMT
Well waking up very early to check my pay had gone in the bank i decided to spalsh out on the last couple of things i needed, Brake pads and seals!
I bought a full set of seasl (Obviously) and a set of rear pads which should complete my service to the divvy.
Alongside that i have sitting in my room:
4 Litres of Rock Oil Guardian 10w-40 Semi-Synthetic Oil
250ml of Rock Oil Dot 4 Brake Fluid
4x NGK CR8E Spark Plugs (Which set me back £6.00 each! Ripped off there!)
Champion Oil Filter
Standard Air Filter
Oil Filter Wrench
16mm Stanley Spark Plug Socket
Stanley extension bar
All i need to do is get those valves measured accurately and im sorted!
I should probably buy some new crush washers for the sump plug/brakes but im being tight with my money so im just going to heat and douse them so i can reuse them.
What a fun day this should be!
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Post by Padster on Apr 17, 2009 7:30:41 GMT
I have had the pad material come away on both car and bike brakes. There was plenty of pad material left but it had run hot many times and the material seperated fom the backing.
On the car it was due to a sticking handbrake mechanism.
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Post by mikestrong on Apr 17, 2009 8:35:47 GMT
If you think those pads are bad you should see Flymo's from the Normandy Run  Spect he'll be doing some work on them this week-end if not done already. |
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Post by teejayexc on Apr 17, 2009 9:43:08 GMT
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Post by Flymo on Apr 17, 2009 14:27:30 GMT
LoL Very good guys ;D My rear caliper came apart much easier than i was expecting, cleaned up nicely, soon had the new seals in that i'd already bought from a fellow club member, and after putting my old worn but useable disk back on the rear wheel and new pads i was ready to go by mid afternoon Tuesday It was i must admit my own fault really as i knew that the pistons where sticking, but didn't want to risk taking the caliper apart before going to Normandy in case i broke it and was unable to source a replacement in time... Flymo |
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Post by CD on Apr 17, 2009 16:01:09 GMT
Never mind Flymo... ;D I had a similar problem before going to a week's work down in Bristol. Exercised the pistons in/out - sorted Oh yes.  I arrived with the black paint in the middle of the disc burnt into pale grey ash. !!! The pads/pistons literally kicked back and I managed all week on the front brake. Thank goodness the back brake does so little anyway. The Divvie back brake seems overworked/undersized wearing its pads quickly and all the brake pad dust clogs everything up. But a back brake that easily locks the wheel is never a good idea. My disc survived the ordeal and a year or more later its about due for replacement. It will be replaced when the existing pads wear out. Rapid brake wear seems to be a constant problem on bikes. |
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