Author Topic: Brake Caliper Pistons (Read 31483 times)

anutz · « **Reply #50 on:** 04 May 2015, 08:24:51 pm »

rear caliper and one of its pads, which looks like treasure.....

sinto · « **Reply #51 on:** 04 May 2015, 08:37:27 pm »

What's wrong with them? Looks perfectly normal to me

But really, guess that's more cleaning and work for you mate, I'm sure you'll get it done to your usual high standards ;-)

riedrider · « **Reply #52 on:** 04 May 2015, 08:40:17 pm »

You should scrap the caliper. There seems to be a groove in the left pad guide.
I scraped a front caliper for a much smaler one....

sinto · « **Reply #53 on:** 04 May 2015, 08:47:27 pm »

Quote from: riedrider on 04 May 2015, 08:40:17 pm

You should scrap the caliper. There seems to be a groove in the left pad guide.
I scraped a front caliper for a much smaler one....

Can that cause a major problem? Just checking in case I see it on mine when I strip them down, I'm just letting anutz do all his stuff then I'll do all mine come the winter.

riedrider · « **Reply #54 on:** 04 May 2015, 08:51:49 pm »

It can prevent the pad from moving against the disk.
The pad sould slide freely on the guide like it is possible on the right side where everything is flat.
The goove can make it stick.

anutz · « **Reply #55 on:** 04 May 2015, 09:00:37 pm »

i will go take a closer look at the guides and see what it is like.....

What can you replace it with - i have never really had to buy new brake calipers...

Is their a good recommended one?

I see some owners replace them with a 1000 FZS Rear Caliper.....

sinto · « **Reply #56 on:** 04 May 2015, 09:08:14 pm »

Quote from: riedrider on 04 May 2015, 08:51:49 pm

It can prevent the pad from moving against the disk.
The pad sould slide freely on the guide like it is possible on the right side where everything is flat.
The goove can make it stick.

I replied to this but it didn't post, probably same reason for not realising it would cause a problem.... Too many beers hic

unfazed · « **Reply #57 on:** 04 May 2015, 09:40:11 pm »

I have recovered worse calipers than that. Obviously a replacement Fzs1000 or post 2009 Xjr1300 caliper is the easiest option

I use wonder Wheel alloy wheel cleaner to clean up the caliper first.

WONDER-WHEELS-SUPER-ALLOY-WHEEL-CLEANER-KIT-SET-1LITRE-CAR-AUTO-EXPRESS-BEST-BUY height=268 height=213

WONDER-WHEELS-SUPER-ALLOY-WHEEL-CLEANER-KIT-SET-1LITRE-CAR-AUTO-EXPRESS-BEST-BUY height=268 height=213

Use with care as it is acid based, follow the instructions exactly, then wash it down well. Check if you can open the bleed nipples and then remove the pistons if possible. You need to check the seal slots. If the seal slots cannot be cleaned up than replacement is the only solution.
If the nipples are removable and seal slots can be cleaned up; replace pistons and seals and nipples if necessary.
Dismantle the two sides only as a last resort as the small seals can be very difficult to get.

anutz · « **Reply #58 on:** 04 May 2015, 09:44:25 pm »

Thanks Unfazed, plan is to pop all pistons out and clean and wet and dry them - see what state they are in...

Also i am cautious about the seals, need to see if the replacment ones i have ordered will be ok, not sure if they have the correct form on the dust seals...

sure i will have more to follow as i do this anyway...

unfazed · « **Reply #59 on:** 04 May 2015, 10:00:03 pm »

Often times they look much worse than they actually are.

The spring at the bottom of the caliper comes out with a bit of fiddling, it is to keep pressure on the pads and stops them rattling. Replace the slid pins also.

The alloy wheel cleaner will get most crap off the piston also without damage, I normally use a sharpen piece of very hard plastic as a scraper for the tough bit and since it will be softer than steel it won't damage the pistons. Not to keen on using wet and dry.

mobile mouse · « **Reply #60 on:** 04 May 2015, 10:20:48 pm »

My rear caliper was as bad if not worse.
I ended up splitting the caliper to aid in the cleaning.
I just greased the O ring before clamping back up. I just took my time and had no issues at all.

After cleaning up it works great and is performing better than expected.

sinto · « **Reply #61 on:** 04 May 2015, 10:29:42 pm »

Quote from: mobile mouse on 04 May 2015, 10:20:48 pm

I ended up splitting the caliper to aid in the cleaning.

How did you split the caliper? Thought this is cast as one piece?

Quote from: mobile mouse on 04 May 2015, 10:20:48 pm

is performing better than expected.

If you've split it, will it be as strong as before?

anutz · « **Reply #62 on:** 04 May 2015, 10:32:46 pm »

OK ordered some Wonder Wheels....lets see what it does to the pistons

If it saves me using anything too mechanically abrasive thats good....just let the chemicals do their job...

Dave48 · « **Reply #63 on:** 05 May 2015, 07:04:18 am »

Quote from: sinto on 04 May 2015, 10:29:42 pm

Quote from: mobile mouse on 04 May 2015, 10:20:48 pm

I ended up splitting the caliper to aid in the cleaning.

How did you split the caliper? Thought this is cast as one piece?

Quote from: mobile mouse on 04 May 2015, 10:20:48 pm

is performing better than expected.

If you've split it, will it be as strong as before?

Easy enough to take apart in a (suitably padded) bench vice. The 2 halves bolt together. The very small central "O" ring seal is available included as a seal kit from Powerhouse Automotive, Sheffield. Their pattern seals fit perfectly unlike some other some on the market.

sinto · « **Reply #64 on:** 05 May 2015, 07:59:52 am »

Ahh right, found this, it might help.

Paul · « **Reply #65 on:** 05 May 2015, 11:59:03 am »

I once had a problem with both front discs binding on the pads.

There was no corrosion on the pistons, but the seals were not pulling the pistons back fully when I let off the brake.

The cure was new seals.

I reckon the cause was either toasting the front brake doing the Hard Knot & Wyrenose pass twice as fast as I could
Or
Possibly topping up the system using DOT3 brake fluid..... I think it was DOT3, or if it wasn't the wrong brake fluid.

unfazed · « **Reply #66 on:** 05 May 2015, 05:31:59 pm »

Powerhouse Automotive, Sheffield.
http://www.powerhouseautomotive.co.uk/content/motorcycle-brakes/motorcycle-brake-caliper-services.php

Good for you Dave48

Did not know this group existed, they do complete kits for the Fzs600 rear caliper including the Seals between the two halves

sinto · « **Reply #67 on:** 05 May 2015, 08:41:51 pm »

This would be better anutz as it's actually off our bike!
https://www.yamahamotorcyclespares.co.uk/genuineparts/9657/32/yamaha%20fzs600sp%20fazer/rear%20brake%20caliper?uid=0&DisplayID=9657

mobile mouse · « **Reply #68 on:** 05 May 2015, 09:09:57 pm »

Mine was a rear caliper from a 600.
You can split this rear caliper. I torqued it back to 40Nm there is only 1 gallery between each half.

anutz · « **Reply #69 on:** 05 May 2015, 10:48:04 pm »

Does anyone know if the seals i bought look ok - there is a link posted earlier - its the only thing i cannot figure out - until i get them...

what is this elusive double lip dust seal?!

http://www.ebay.co.uk/itm/200831498651?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Some listings say the double lip seals are vital??!

or am i being too OCD?

darrsi · « **Reply #70 on:** 05 May 2015, 11:10:05 pm »

Similar to this i s'pose?

anutz · « **Reply #71 on:** 06 May 2015, 07:49:22 am »

does anyone have an OEM one to hand - to photo - if not i will have as soon as my pump adapter gets here

Fazerider · « **Reply #72 on:** 06 May 2015, 09:11:16 am »

anutz · « **Reply #73 on:** 06 May 2015, 04:10:55 pm »

Thanks for posting that...

I shall see what mine a like when they arrive - if they are not like that i will have to return them....

i suppose?

riedrider · « **Reply #74 on:** 06 May 2015, 04:34:23 pm »

The Tourmax kit I used for the R1 front calipers for my TDM had also double lips.
Here you can find a picture (click to enlarge)
https://www.motointegrator.de/artikel/1068912-reparatursatz-bremssattel-tourmax-bcf-213