Honda-Forums.com: Workshop

Calendar

Help

Home

Home » Readers Rides » Workshop » Brakes

Show: Today's Messages :: Show Polls :: Message Navigator

Brakes [message #218924]

Mon, 26 July 2010 12:02

Swiss T

Messages: 5166
Registered: February 2004
Location: Sunny Stockport

(14) Eddie Lawson

I have an issue with the front brakes on my RRP.

I recently replaced the pads, fluid & copper washers on the lines & gave them a good bleed. I did have an issue with weeping bleed nipples [fluid coming from the threads, not the hole] but PTFE on the threads stopped it.

There must be air getting in somewhere because the lever keeps getting spongy. If I clamp the lever on & leave overnight it gets firm again; but then in a few days its spongy again.

I am not loosing any fluid.

Any suggestions on where to look before I start thinking about a new MC?

smile

Report message to a moderator

Re: Brakes [message #218983 is a reply to message #218924]

Mon, 26 July 2010 20:34

Rammy

Messages: 410
Registered: May 2004
Location: Lancashire

(4) WSS Racer

There be air in there somewhere mate.

I use a large syringe to reverse bleed systems, less likeley to get air in as it forces up the pipes and pushes the air out the top (res).

Well worth giving them another bleeding (do you have a kit or is it just pour in and leak out? Blush

Report message to a moderator

Re: Brakes [message #219004 is a reply to message #218983]

Mon, 26 July 2010 23:56

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

Hi Swiss,

I'm thinking master cylinder seals.

http://www.davidsilverspares.co.uk/CBR900RRP-FIREBLADE-1993/ part_45620/

Supose it could be air trapped in system, but once its gone hard you wouldn't expect it to go soft again!

If your not loosing any fluid, can't see wot else it could b.

Wouldn't put a sec hand MC on as its probably no better than the one youve got.

All u need (apart from a few spanners) to change master cylinder seals is circlip pliers. JUst make sure seals go on right way round.

SPal

Report message to a moderator

Re: Brakes [message #219013 is a reply to message #218983]

Tue, 27 July 2010 08:15

Swiss T

Messages: 5166
Registered: February 2004
Location: Sunny Stockport

(14) Eddie Lawson

Rammy wrote on Mon, 26 July 2010 20:34

There be air in there somewhere mate.

I use a large syringe to reverse bleed systems, less likeley to get air in as it forces up the pipes and pushes the air out the top (res).

Well worth giving them another bleeding (do you have a kit or is it just pour in and leak out?

That is how I fill it Si Thumbs Up

They are fine when bled; the air is getting back in afterwards.

smile

Report message to a moderator

Re: Brakes [message #219014 is a reply to message #219004]

Tue, 27 July 2010 08:17

Swiss T

Messages: 5166
Registered: February 2004
Location: Sunny Stockport

(14) Eddie Lawson

SPAL wrote on Mon, 26 July 2010 23:56

Hi Swiss,

I'm thinking master cylinder seals.

http://www.davidsilverspares.co.uk/CBR900RRP-FIREBLADE-1993/ part_45620/

Supose it could be air trapped in system, but once its gone hard you wouldn't expect it to go soft again!

If your not loosing any fluid, can't see wot else it could b.

Wouldn't put a sec hand MC on as its probably no better than the one youve got.

All u need (apart from a few spanners) to change master cylinder seals is circlip pliers. JUst make sure seals go on right way round.

SPal

Think you may be right Al.

I will get the kit & send you the bill if it doesn't work. Thumbs Up

Report message to a moderator

Re: Brakes [message #219020 is a reply to message #219013]

Tue, 27 July 2010 12:46

SP2 Riley

Messages: 3956
Registered: January 2008
Location: peterborough

(11) MotoGP Podium Finisher

Swiss T wrote on Tue, 27 July 2010 08:15

Rammy wrote on Mon, 26 July 2010 20:34
There be air in there somewhere mate.

I use a large syringe to reverse bleed systems, less likeley to get air in as it forces up the pipes and pushes the air out the top (res).

Well worth giving them another bleeding (do you have a kit or is it just pour in and leak out?

That is how I fill it Si

They are fine when bled; the air is getting back in afterwards.

id try a new master cylinder repair kit swiss

there only £20 (i think your mc must be drawing air in via the piston seal in the MC )

do you get any tiny sign of fluid where the lever goes into thr MC?

Report message to a moderator

Re: Brakes [message #219081 is a reply to message #219020]

Wed, 28 July 2010 17:00

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

Hi Riley,

Who do u know that does these kits for £20.00

please share

SPal

Hi Swiss,

Its only advice and dosn't come with a warranty Laugh

Report message to a moderator

Re: Brakes [message #219089 is a reply to message #219081]

Wed, 28 July 2010 19:10

SP2 Riley

Messages: 3956
Registered: January 2008
Location: peterborough

(11) MotoGP Podium Finisher

thers tons of these on ebay and there perfect as ive used a few.

just type in your model etc ie fireblade master cylinder kit

http://cgi.ebay.co.uk/HONDA-CBR600-FRONT-BRAKE-MASTER-CYLIND ER-REPAIR-KIT-/270605612423?cmd=ViewItem&pt=UK_Motorcycl e_Parts&hash=item3f0159f587#ht_1741wt_912

Report message to a moderator

Re: Brakes [message #219091 is a reply to message #219089]

Wed, 28 July 2010 19:15

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

ebay is truely wonderous.

SPal Laugh

(in search of cheep parts across the universe).

Report message to a moderator

Re: Brakes [message #219924 is a reply to message #218924]

Mon, 09 August 2010 08:40

Swiss T

Messages: 5166
Registered: February 2004
Location: Sunny Stockport

(14) Eddie Lawson

MC working parts & bleed nipples replaced.

No fecking difference. Confused

I washed the calipers in petrol a short while ago; is it possible it has ruined the piston seals?

Get your coat

Report message to a moderator

Re: Brakes [message #219926 is a reply to message #219924]

Mon, 09 August 2010 09:46

Kakugo

Messages: 3370
Registered: August 2003
Location: Lugdunon

(11) MotoGP Podium Finisher

Swiss T wrote on Mon, 09 August 2010 09:40

MC working parts & bleed nipples replaced.

No fecking difference.

I washed the calipers in petrol a short while ago; is it possible it has ruined the piston seals?

Yes.
Why did you use petrol?

Report message to a moderator

Re: Brakes [message #219928 is a reply to message #219926]

Mon, 09 August 2010 10:12

SP2 Riley

Messages: 3956
Registered: January 2008
Location: peterborough

(11) MotoGP Podium Finisher

ummmmm that may have made the seals soft and expand or deteriorate in some way

funny things these seals

Report message to a moderator

Re: Brakes [message #219929 is a reply to message #219926]

Mon, 09 August 2010 10:13

Swiss T

Messages: 5166
Registered: February 2004
Location: Sunny Stockport

(14) Eddie Lawson

Kakugo wrote on Mon, 09 August 2010 09:46

Swiss T wrote on Mon, 09 August 2010 09:40
MC working parts & bleed nipples replaced.

No fecking difference.

I washed the calipers in petrol a short while ago; is it possible it has ruined the piston seals?

Yes.
Why did you use petrol?

I was using a degreaser bath to clean off some parts so just chucked them in; it never occured to me that it may ruin the seals.

Blush

Report message to a moderator

Re: Brakes [message #219935 is a reply to message #219929]

Mon, 09 August 2010 13:19

SPAL

Messages: 835
Registered: June 2009
Location: London

(7) 125 GP Winner

Hi Swiss,

If your going to the trouble of changing all the seals, it may be easier to split both the calipers and change the sealing washers between the two halves.

Only prob is you need security tork sockets.

SPal

Report message to a moderator

Previous Topic:	Is this normal?
Next Topic:	Suggest me a battery brand

Goto Forum:

-=] Back to Top [=-

[

]

Current Time: Sun Sep 05 17:06:35 BST 2010

.:: Contact :: Home ::.