Author Topic: Cr 84 hydraulic brake drag  (Read 7854 times)

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Re: Cr 84 hydraulic brake drag
« Reply #15 on: January 02, 2014, 08:39:26 pm »

Offline crs-and-rms

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Re: Cr 84 hydraulic brake drag
« Reply #16 on: January 02, 2014, 08:40:18 pm »
id try your local  honda dealer first

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #17 on: January 02, 2014, 08:47:48 pm »
There's new seal kits on ebay

http://m.ebay.com.au/itm/150913639199?nav=WATCHING&sbk=1

Man you are quicker on eBay than me

I also saw a kit with the pistons. That would be the go!

Can you get them in oz? I was thinking maybe ballards ?
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

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Re: Cr 84 hydraulic brake drag
« Reply #18 on: January 02, 2014, 08:58:56 pm »
There's new seal kits on ebay

http://m.ebay.com.au/itm/150913639199?nav=WATCHING&sbk=1

Man you are quicker on eBay than me


That's why my credit card account is in the state it is.

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #19 on: January 03, 2014, 08:18:59 pm »
Thanks for the help gents. Ordered seal kit from Honda today.
Hope to fit it Monday


Thanks again
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

Offline Ktm181

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Re: Cr 84 hydraulic brake drag
« Reply #20 on: January 03, 2014, 09:59:39 pm »


when you do the caliper seal make sure you have a very close look inside the groove in the caliper, you'd be amazed how much hidden crap gets in and stays in there and deforms the seal causing drag. AND don't use rubber grease.
Kt

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #21 on: January 04, 2014, 05:57:10 pm »


when you do the caliper seal make sure you have a very close look inside the groove in the caliper, you'd be amazed how much hidden crap gets in and stays in there and deforms the seal causing drag. AND don't use rubber grease.
Kt

Thanks for the tip. I appreciate it.
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

STW996

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Re: Cr 84 hydraulic brake drag
« Reply #22 on: January 06, 2014, 11:04:22 am »
It won't be the seals in the caliper it will be more likely a warped disc. I have only had 2 instances when the brakes have dragged on my 84 CR's and one was the piston kit in the master cylinder (this will stop the piston from retracting and is a common cause) and if you say you have removed the master cylinder and they are still dragging it will be most likely a warped disc (they turn themselves inside out and curve one way with age, specially if worn) take the disc off and lay it flat on a desk to check this, flip it over and measure the distance of both to the desk to check this. It is hard to pick by eye on the bike and as it is not bend it will not drag as such (like a tight spot) but will be firm as you spin the wheel all round.

The seals in the caliper themselves are pretty bullet proof (I have found anyway) they have a very basic function and are only really a problem if they are leaking.

As usual Only my 2 bobs worth and I have been wrong before but have had several of these bikes as vintage bikes and this is the problems I have incurred.

Shane


Offline Ted

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Re: Cr 84 hydraulic brake drag
« Reply #23 on: January 06, 2014, 01:34:02 pm »
It's Shane's old bike isn't it Paul?
81 YZ 465 H   77 RM 125 B

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #24 on: January 06, 2014, 03:21:08 pm »
No Ted it is the 125 I have.
I will double check the disk when I do the seals.

I will be sure to let everyone know.

Thanks also to Shane for the input.

'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

STW996

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Re: Cr 84 hydraulic brake drag
« Reply #25 on: January 06, 2014, 05:07:28 pm »
Thought I recognised the name. Paul all the parts from the 250 fit the 125 so just swap things out till you find the problem.

Sorry Paul which bike did you get off me was it W6?? if so that had the best front disc of all the bikes.

Shane

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #26 on: January 06, 2014, 06:08:17 pm »
Sure was W6 :)
Great bike!!!
'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F

STW996

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Re: Cr 84 hydraulic brake drag
« Reply #27 on: January 07, 2014, 06:42:33 am »
Just a side note to this, we lined up a drag a couple of years back between this bike, my 89 250 and Geoff Mc Mullin's 07 CR 250 and there was only a bike length between all of them up to 5 gear!! them 84 250's (and in particular that bike) go very hard.

Let me know how you get on with the brake issue Paul.

Shane

Offline Ted

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Re: Cr 84 hydraulic brake drag
« Reply #28 on: January 07, 2014, 12:33:52 pm »
So, no excuses now Pauly ;D
81 YZ 465 H   77 RM 125 B

Offline Paul552

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Re: Cr 84 hydraulic brake drag
« Reply #29 on: January 07, 2014, 05:16:04 pm »
Ok Gents.
I am very pleased to report problem fixed!!!!!
To all those that had input thanks very much.

All those who had money on the seals were correct.
Although the seals didn't leak and did retract,  after changing the seals the problem is fixed!!!! 
I am pretty sure the trailing piston seal was not as good as the leading one. After removing both they looked different. The trailing one didn't look "tapered" like the new ones.

Thanks to all for the help and offers of assistance!!!

'77 YZ125D '84 CR250RE '89 CR250RK '84 CR80RE  '09 YZ250F