2001 SP1 Brakes - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 05-25-2014, 03:50 PM Thread Starter
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2001 SP1 Brakes

Hi Everyone

Now the proud owner of a 2001 SP1, my query is that the brakes don't seem to be very powerful. I also own a GSXR1000K3 with galfer wavy discs front and rear and they are awesome. I can't get the front brake reservoir lid off due to the bottom nut rusted in and the plastic keeps allowing the nut to turn so I will have to renew, I'm just wondering if the front brakes need bleeding to cure the poor brakes? Any advice on how the brakes should feel would be appreciated

Thanks
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post #2 of 10 (permalink) Old 05-25-2014, 04:25 PM
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Can't speak for anyone else, but when mine was MOT'd the tester said it was the highest brake reading he had ever seen from a sports bike in twenty plus years of MOT testing. So they should be very good. Sounds like yours has suffered from a bit of neglect of the reservoir cap nuts are seized, as these should be off regularly for servicing.
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post #3 of 10 (permalink) Old 05-25-2014, 04:52 PM
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It's been said that the RC has one of the best braking systems of its time. My guess is that it just needs a cleaning and fluid change.

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post #4 of 10 (permalink) Old 05-25-2014, 04:56 PM
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Another thing to consider is that the RC is probably a good 80 lbs heavier than the GSXR

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post #5 of 10 (permalink) Old 05-25-2014, 06:03 PM
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Just a quick tip that might help you to unscrew the reservoir screw.

Get a bradawl or very small flat blade screwdriver and you can use this to push against the tiny hex nut (the nut sits in a small recess in the lower part of the reservoir)

Simply push the bradawl or screwdriver against the nut & this will stop the nut spinning and allow you to unscrew the Philips head screw holding the reservoir cap on.
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post #6 of 10 (permalink) Old 05-26-2014, 11:21 AM
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^ that, and give it a shot of PB or other penetrating fluid.

If that nut is rusted onto the bolt, I wonder how long it's been since the fluid was changed. Your brake fluid could be in VERY poor condition. I bet your brake pistons and seals are gunked up too.

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post #7 of 10 (permalink) Old 05-26-2014, 02:42 PM Thread Starter
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Tryed all the things mentioned, I had to take the reservoir off the bike and the only thing salvageable was the cap. The diaphram wasn't sitting correctly in the reservoir, the fluid was a horrible used colour and didnt drain easily, so I am assuming this could be the cause of the brakes being less efficient, although it passed it's m.o.t on monday, so they must meet legal uk requirements. I am buying a new reservoir and all three diaphrams inside, 2x bolts and new short rubber hose to make sure everything is ok in that department, failing this I will have to take the calipers apart and fit new seals. It has HEL hoses so there shouldn't be anything wrong there.
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post #8 of 10 (permalink) Old 05-26-2014, 04:50 PM
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I'd strip it all down clean everything, and fit new seals. You don't want to be messing around with might be okay/could be okay, make sure it's all in top condition, your life might depend on them. Seal kits cost nothing in the big scheme of things, for me is not worth not replacing them. I like to know when I pull that lever it's going to stop me as quick as possible.
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post #9 of 10 (permalink) Old 05-26-2014, 08:23 PM
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Welcome. Sounds like a bike used in all weathers, or kept exposed to the elements. In any case, your brake calipers WILL need rebuilding.

Take the calipers off (Compressed air is best for taking the pistons out, use a bent paperclip if you don't have a suitable pick and gently take out the seals, before using a brass brush on a dremmel to clean inside the recesses. There will probably be corrosion there... and is the typical cause of brake calipers not operating efficiently combined with crap stuck onto the pistons (I'd polish them clean, best not to sand as they're coated)
Re-assemble using at least fresh brake fluid to coat the seals and pistons before re-assembly.

You may also want to replace the pads if they're suspect.
I'd also do the same with the master cylinder. And don't only do your front brakes - may as well look at the rears since they'll have been exposed to a lot of crud & moisture through their lives on the bike too.

If you do all of this, your brakes should work perfectly. They're plenty powerful as standard but like anything, need proper maintenance.

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post #10 of 10 (permalink) Old 06-05-2014, 03:52 PM Thread Starter
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Hi Guys, new honda reservoir and diaphrams fitted and new brake fluid.This has transformed the brakes, they are now superb like I imagined that should have been!
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